Add ^^/ shortcut to top-level build directory - close #146

Bumps [redcarpet](https://github.com/vmg/redcarpet) from 3.5.0 to 3.5.1.
- [Release notes](https://github.com/vmg/redcarpet/releases)
- [Changelog](https://github.com/vmg/redcarpet/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vmg/redcarpet/compare/v3.5.0...v3.5.1)

Signed-off-by: dependabot[bot] <support@github.com>

CHANGELOG.md

@@ -1,3 +1,33 @@
+## v2.3.0
+
+### New Features
+
+- #125 - Support subsidiary Rsconscript files
+- #126 - Add PATH manipulation methods
+
+### Fixes
+
+- #121 - env.depends() does not work with built-root-relative "^/" paths
+- #130 - Document -f command line option
+- #133 - Clarify failed command error message indicating to run -F
+- #134 - Document CMD_STDOUT variable for Command builder
+- #135 - Write dependency file to build directory when user invokes Object builder directly
+- #141 - Document phony targets
+
+## v2.2.0
+
+### New Features
+
+- #120 - improve support for MSYS2
+- #119 - add failure messages for failed configuration checks
+- #118 - compiler checks should support cross-compilers and freestanding compilers
+
+## v2.1.0
+
+### New Features
+
+- #117 - ruby 2.7 compatibility
+
 ## v2.0.2
 
 ### Fixes

DEVELOPING.md

@@ -0,0 +1,14 @@
+# Developing
+
+# Specs
+
+To run the rscons specs, the following commands must be available:
+
+* gcc
+* clang
+* g++
+* clang++
+* gdc
+* ldc
+* flex
+* bison

Gemfile

@@ -1,10 +1,14 @@
 source 'https://rubygems.org'
 
-gem "json"
 gem "rspec"
 gem "rake"
-gem "simplecov"
-gem "yard"
-gem "rdoc"
-gem "redcarpet"
-gem "syntax"
+gem "simplecov", "~> 0.15.0"
+if RbConfig::CONFIG["host"]["msys"]
+  gem "json", "2.1.0"
+else
+  gem "json"
+  gem "yard"
+  gem "rdoc"
+  gem "redcarpet"
+  gem "syntax"
+end

Gemfile.lock

@@ -1,32 +1,32 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    diff-lcs (1.3)
-    docile (1.3.2)
-    json (2.2.0)
-    rake (12.3.2)
-    rdoc (6.1.1)
-    redcarpet (3.4.0)
-    rspec (3.8.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-    rspec-core (3.8.2)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.4)
+    diff-lcs (1.4.4)
+    docile (1.1.5)
+    json (2.5.1)
+    rake (13.0.6)
+    rdoc (6.3.2)
+    redcarpet (3.5.1)
+    rspec (3.10.0)
+      rspec-core (~> 3.10.0)
+      rspec-expectations (~> 3.10.0)
+      rspec-mocks (~> 3.10.0)
+    rspec-core (3.10.1)
+      rspec-support (~> 3.10.0)
+    rspec-expectations (3.10.1)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-mocks (3.8.1)
+      rspec-support (~> 3.10.0)
+    rspec-mocks (3.10.2)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-support (3.8.2)
-    simplecov (0.15.0)
+      rspec-support (~> 3.10.0)
+    rspec-support (3.10.2)
+    simplecov (0.15.1)
       docile (~> 1.1.0)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
     syntax (1.2.2)
-    yard (0.9.20)
+    yard (0.9.26)
 
 PLATFORMS
   ruby
@@ -38,9 +38,9 @@ DEPENDENCIES
   rdoc
   redcarpet
   rspec
-  simplecov
+  simplecov (~> 0.15.0)
   syntax
   yard
 
 BUNDLED WITH
-   1.17.3
+   2.1.4

Rakefile.rb

@@ -6,7 +6,6 @@ rescue Bundler::BundlerError => e
 end
 
 require "rspec/core/rake_task"
-require "yard"
 require "rake/clean"
 require "fileutils"
 
@@ -18,12 +17,16 @@ task :build_dist do
 end
 
 RSpec::Core::RakeTask.new(:spec, :example_string) do |task, args|
+  ENV["specs"] = "1"
   if args.example_string
     ENV["partial_specs"] = "1"
     task.rspec_opts = %W[-e "#{args.example_string}" -f documentation]
   end
 end
 task :spec => :build_dist
+task :spec do
+  ENV.delete("specs")
+end
 
 # dspec task is useful to test the distributable release script, but is not
 # useful for coverage information.
@@ -32,16 +35,11 @@ task :dspec, [:example_string] => :build_dist do |task, args|
   FileUtils.mkdir_p("test")
   FileUtils.cp("dist/rscons", "test/rscons.rb")
   ENV["dist_specs"] = "1"
-  Rake::Task["spec"].invoke(args.example_string)
+  Rake::Task["spec"].execute(args.example_string)
   ENV.delete("dist_specs")
   FileUtils.rm_f(Dir.glob(".rscons-*"))
 end
 
-YARD::Rake::YardocTask.new do |yard|
-  yard.files = ['lib/**/*.rb']
-  yard.options = ["-ogen/yard"]
-end
-
 task :gen_large_project, [:size] => :build_dist do |task, args|
   size = (args.size || 10000).to_i
   FileUtils.rm_rf("large_project")
@@ -88,8 +86,17 @@ EOF
   FileUtils.cp("dist/rscons", "large_project")
 end
 
-task :user_guide do
-  system("ruby", "-Ilib", "rb/gen_user_guide.rb")
+unless RbConfig::CONFIG["host"]["msys"]
+  require "yard"
+  YARD::Rake::YardocTask.new do |yard|
+    yard.files = ['lib/**/*.rb']
+    yard.options = ["-ogen/yard"]
+  end
+
+  desc "Build user guide"
+  task :user_guide do
+    system("ruby", "-Ilib", "rb/gen_user_guide.rb")
+  end
 end
 
 task :default => :spec
@@ -97,6 +104,7 @@ task :default => :spec
 task :all => [
   :build_dist,
   :spec,
+  :dspec,
   :yard,
   :user_guide,
 ]

build_tests/configure/check_d_import_d_import_path.rb

@@ -1,4 +1,5 @@
 configure do
+  check_d_compiler
   check_d_import "std.stdio", check_d_import_path: ["./usr1"]
   check_d_import "frobulous", check_d_import_path: ["./usr2"]
 end

build_tests/configure/check_d_import_success.rb

@@ -1,3 +1,4 @@
 configure do
+  check_d_compiler
   check_d_import "std.stdio"
 end

build_tests/configure/on_fail.rb

@@ -0,0 +1,5 @@
+configure do
+  check_c_compiler "foo123c", fail: false, on_fail: "Install the foo123 package"
+  check_d_compiler "foo123d", fail: false
+  check_cxx_compiler "foo123cxx", on_fail: lambda {puts "Install the foo123cxx package"}
+end

build_tests/install_running_exe/Rsconscript

@@ -1,6 +0,0 @@
-build do
-  Environment.new do |env|
-    env.Program("program.exe", "program.c")
-    env.Install("install/program.exe", "program.exe")
-  end
-end

build_tests/install_running_exe/program.c

@@ -1,8 +0,0 @@
-#include <stdio.h>
-#include <unistd.h>
-
-int main(int argc, char * argv[])
-{
-    sleep(2);
-    return 0;
-}

build_tests/sh/sh.rb

@@ -0,0 +1,4 @@
+build do
+  sh "echo", "hi  there"
+  sh(["echo  1  2"])
+end

build_tests/sh/sh_fail.rb

@@ -0,0 +1,4 @@
+build do
+  sh "foobar42"
+  sh "echo", "continued"
+end

build_tests/sh/sh_fail_continue.rb

@@ -0,0 +1,4 @@
+build do
+  sh "foobar42", continue: true
+  sh "echo", "continued"
+end

build_tests/simple/path_append/foobar

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo "foobar!"

build_tests/simple/path_append/gcc

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exit 42

build_tests/simple/path_prepend/flex

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+echo "flex!"

build_tests/simple/pathing.rb

@@ -0,0 +1,10 @@
+path_prepend "path_prepend"
+path_append "path_append"
+
+build do
+  Environment.new do |env|
+    system("flex")
+    system("foobar")
+    env.Object("simple.o", "simple.c")
+  end
+end

build_tests/simple/size.rb

@@ -0,0 +1,6 @@
+build do
+  Environment.new do |env|
+    env.Program("simple.exe", glob("*.c"))
+    env.Size("simple.size", "simple.exe")
+  end
+end

build_tests/simple/user_dependencies_carat.rb

@@ -0,0 +1,18 @@
+class FileBuilder < Builder
+  def self.name
+    "File"
+  end
+  def run(options)
+    FileUtils.mkdir_p(File.dirname(@target))
+    File.binwrite(@target, ENV["file_contents"])
+    true
+  end
+end
+build do
+  Environment.new do |env|
+    env.add_builder(FileBuilder)
+    env.File("^/file.txt")
+    program = env.Program("^/simple.exe", Dir["*.c"])
+    env.depends("^/simple.exe", "^/file.txt")
+  end
+end

build_tests/subsidiary/Rsconscript

@@ -0,0 +1,10 @@
+configure do
+  rscons "sub/Rsconscript"
+  rscons "sub/Rsconscript2", "configure"
+  puts "top configure"
+end
+
+build do
+  rscons "sub/Rsconscript2", "build"
+  puts "top build"
+end

build_tests/subsidiary/Rsconscript_dir

@@ -0,0 +1,10 @@
+configure do
+  rscons "sub"
+  rscons "sub", "-f", "Rsconscript2", "configure"
+  puts "top configure"
+end
+
+build do
+  rscons "sub", "-f", "Rsconscript2", "build"
+  puts "top build"
+end

build_tests/subsidiary/Rsconscript_fail

@@ -0,0 +1,9 @@
+configure do
+  rscons "sub/Rsconscript_fail"
+  puts "top configure"
+end
+
+build do
+  rscons "sub/Rsconscript2", "build"
+  puts "top build"
+end

build_tests/subsidiary/Rsconscript_samedir

@@ -0,0 +1,4 @@
+build do
+  rscons "second", "build"
+  puts "top build"
+end

build_tests/subsidiary/second

@@ -0,0 +1,3 @@
+build do
+  puts "second build"
+end

build_tests/subsidiary/sub/Rsconscript

@@ -0,0 +1,7 @@
+configure do
+  puts "sub Rsconscript configure"
+end
+
+build do
+  puts "sub Rsconscript build"
+end

build_tests/subsidiary/sub/Rsconscript2

@@ -0,0 +1,7 @@
+configure do
+  puts "sub Rsconscript2 configure"
+end
+
+build do
+  puts "sub Rsconscript2 build"
+end

build_tests/subsidiary/sub/Rsconscript_fail

@@ -0,0 +1,8 @@
+configure do
+  puts "sub Rsconscript configure"
+  check_program "foobarfailure"
+end
+
+build do
+  puts "sub Rsconscript build"
+end

build_tests/typical/Rsconscript

@@ -0,0 +1,6 @@
+build do
+  Environment.new(name: "typical") do |env|
+    env["CPPPATH"] += glob("src/**")
+    env.Program("^/typical.exe", glob("src/**/*.c"))
+  end
+end

build_tests/typical/carat.rb

@@ -1,9 +1,10 @@
 build do
   Environment.new(echo: :command) do |env|
-    env.append('CPPPATH' => glob('src/**').sort)
+    env.append("CPPPATH" => glob("src/**"))
     FileUtils.mkdir_p(env.build_root)
     FileUtils.mv("src/one/one.c", env.build_root)
+    FileUtils.mv("src/two/two.c", Rscons.application.build_dir)
     env.Object("^/one.o", "^/one.c")
-    env.Program("program.exe", glob('src/**/*.c') + ["^/one.o"])
+    env.Program("^^/program.exe", ["^/one.o", "^^/two.c"])
   end
 end

build_tests/typical/clone_and_name.rb

@@ -0,0 +1,9 @@
+build do
+  base_env = Environment.new do |env|
+    env["CPPPATH"] += glob("src/**")
+  end
+
+  base_env.clone(name: "typical") do |env|
+    env.Program("^/typical.exe", glob("src/**/*.c"))
+  end
+end

build_tests/typical/fileutils_methods.rb

@@ -0,0 +1,11 @@
+build do
+  mkdir "foo"
+  cd "foo" do
+    mkdir_p ["bar/baz", "bar/booz"]
+  end
+  mv "foo/bar", "foobar"
+  rmdir "foo"
+  touch "foobar/booz/a.txt"
+  cp "foobar/booz/a.txt", "foobar/baz/b.txt"
+  rm_rf "foobar/booz"
+end

doc/user_guide.md

@@ -78,10 +78,22 @@ cache file in order to avoid rebuilding a target when it is already up to date.
 ### Build Directory
 
 Rscons was designed to store temporary build artifacts (for example, object
-files, dependency files, etc...) in a `build` directory.
+files, dependency files, etc...) and build system metadata in a
+"build directory".
 This keeps files generated by the build cleanly separated from user-controlled
 source files.
 
+In contrast to other build systems or build system generators, rscons executes
+from the project base directory (up to the user) rather than executing from
+*within* the build directory.
+This keeps any file paths printed by compilers (such as in warning or error
+messages) accurate relative to the project directory, so that the user does not
+need to translate any paths to the correct path within a terminal or editor
+application, for example.
+
+By default a build directory named "build" is used, but this can be overridden
+by the user by using the `-b`/`--build` command-line option.
+
 ## Getting Started
 
 To use Rscons on your project, you must:
@@ -94,7 +106,7 @@ To use Rscons on your project, you must:
 
 Rscons is designed to be distributed as a stand-alone single file script that
 can be copied into and versioned in a project's source tree.
-The only dependency required to run Rscons is to have a Ruby interpreter
+The only requirement to run Rscons is that the system has a Ruby interpreter
 installed.
 The latest release can be downloaded from [https://github.com/holtrop/rscons/releases](https://github.com/holtrop/rscons/releases).
 Simply copy the `rscons` executable script into the desired location within
@@ -209,6 +221,171 @@ called `myprog.exe` which is to be built from all C source files found
 
 The `Rsconscript` file is a Ruby script.
 
+##> Build Script Methods
+
+`rscons` provides several methods that a build script can use.
+
+  * `glob` (see ${#Finding Files: The glob Method})
+  * `path_append` (see ${#PATH Management})
+  * `path_components` (see ${#PATH Management})
+  * `path_prepend` (see ${#PATH Management})
+  * `path_set` (see ${#PATH Management})
+  * `rscons` (see ${#Using Subsidiary Build Scripts: The rscons Method})
+  * `sh` (see (${#Executing Commands: The sh Method})
+
+Additionally, the following methods from the Ruby
+[FileUtils](https://ruby-doc.org/stdlib-3.1.0/libdoc/fileutils/rdoc/FileUtils.html)
+module are made available for the build script to call directly:
+
+  * `cd`
+  * `chmod`
+  * `chmod_R`
+  * `chown`
+  * `chown_R`
+  * `cp`
+  * `cp_lr`
+  * `cp_r`
+  * `install`
+  * `ln`
+  * `ln_s`
+  * `ln_sf`
+  * `mkdir`
+  * `mkdir_p`
+  * `mv`
+  * `pwd`
+  * `rm`
+  * `rm_f`
+  * `rm_r`
+  * `rm_rf`
+  * `rmdir`
+  * `touch`
+
+###> Finding Files: The glob Method
+
+The [`glob`](../yard/Rscons/Script/GlobalDsl.html#glob-instance_method) method can be
+used to find files matching the patterns specified.
+It supports a syntax similar to the Ruby [Dir.glob method](https://ruby-doc.org/core-3.1.0/Dir.html#method-c-glob) but operates more deterministically.
+
+Example use:
+
+```ruby
+build do
+  Environment.new do |env|
+    env.Program("mytests", glob("src/**/*.cc", "test/**/*.cc"))
+  end
+end
+```
+
+This example would build the `mytests` executable from all `.cc` source files
+found recursively under the `src` or `test` directory.
+
+###> PATH Management
+
+`rscons` provides methods for management of the `PATH` environment variable.
+
+The
+[`path_append`](../yard/Rscons/Script/GlobalDsl.html#path_append-instance_method)
+and
+[`path_prepend`](../yard/Rscons/Script/GlobalDsl.html#path_prepend-instance_method)
+methods can be used to append or prepend a path to the `PATH` environment
+variable.
+
+```ruby
+path_prepend "i686-elf-gcc/bin"
+```
+
+The
+[`path_set`](../yard/Rscons/Script/GlobalDsl.html#path_set-instance_method)
+method sets the `PATH` environment variable to the given Array or String.
+
+The
+[`path_components`](../yard/Rscons/Script/GlobalDsl.html#path_components-instance_method)
+method returns an Array of the components in the `PATH`
+environment variable.
+
+###> Using Subsidiary Build Scripts: The rscons Method
+
+The
+[`rscons`](../yard/Rscons/Script/GlobalDsl.html#rscons-instance_method)
+build script method can be used to invoke an rscons subprocess to
+perform an operation using a subsidiary rscons build script.
+This can be used, for example, when a subproject is imported and a top-level
+`configure` or `build` operation should also perform the same operation in the
+subproject directory.
+
+The first argument to the `rscons` method specifies either a directory name, or
+the path to the subsidiary Rsconscript file to execute.
+Any additional arguments are passed to `rscons` when it executes the subsidiary
+script.
+`rscons` will change working directories to the directory containing the
+subsidiary script when executing it.
+
+For example:
+
+```ruby
+configure do
+  rscons "subproject", "configure"
+end
+
+build do
+  rscons "subproject/Rsconscript", "build"
+end
+```
+
+It is also perfectly valid to perform a different operation in the subsidiary
+script from the one being performed in the top-level script.
+For example, in a project that requires a particular cross compiler, the
+top-level `configure` script could build the necessary cross compiler using a
+subsidiary build script.
+This could look something like:
+
+```ruby
+configure do
+  rscons "cross/Rsconscript"
+  check_c_compiler "i686-elf-gcc"
+end
+```
+
+This would build, and if necessary first configure, using the cross/Rsconscript
+subsidiary build script.
+Subsidiary build scripts are executed from within the directory containing the
+build script.
+
+###> Executing Commands: The sh Method
+
+The
+[`sh`](../yard/Rscons/Script/GlobalDsl.html#sh-instance_method)
+build script method can be used to directly execute commands.
+The `sh` method accepts either a single String argument or an Array of Strings.
+When an Array is given, if the array length is greater than 1, then the command
+will not be executed and interpreted by the system shell.
+Otherwise, it will be executed and interpreted by the system shell.
+
+For example:
+
+```ruby
+build do
+  # Run "make" in imported "subcomponent" directory.
+  sh "cd subcomponent; make"
+  # Move a file around.
+  sh "mv", "subcomponent/file with spaces.txt", "new_name.txt"
+end
+```
+
+If the command fails, rscons will normally print the error and terminate
+execution.
+If the `:continue` option is set, then rscons will not terminate execution.
+For example:
+
+```ruby
+build do
+  # This command will fail and a message will be printed.
+  sh "false", continue: true
+  # However, due to the :continue option being set, execution will continue.
+  sh "echo hi"
+end
+```
+
 ##> Configuration Operations
 
 A `configure` block is optional.
@@ -246,6 +423,15 @@ configure do
 end
 ```
 
+Global configuration options may be supplied to the compiler checks as well.
+Example:
+
+```ruby
+configure do
+  check_c_compiler "x86_64-elf-gcc", on_fail: "Install x86_64-elf cross toolchain first!"
+end
+```
+
 ###> Checking for a Header File
 
 The following methods can be used to check for the presence of a header file:
@@ -272,18 +458,6 @@ end
 
 Optionally specifies an array of paths to look for the header file in.
 
-##### `:fail`
-
-If the `:fail` option is set to `false`, then the absence of the header file
-will not result in the configure option failing.
-The `:fail` option defaults to `true` if the `:set_define` option is not
-defined, and defaults to `false` if the `:set_define` option is defined.
-
-##### `:set_define`
-
-If set, a build define of the specified String will be added to the
-`CPPDEFINES` construction variable array if the requested header is found.
-
 ###> Checking for a D Import
 
 The `check_d_import` method can be used to check for the presence of D import.
@@ -327,18 +501,6 @@ end
 
 Optionally specifies an array of paths to look for the library in.
 
-##### `:fail`
-
-If the `:fail` option is set to `false`, then the absence of the library
-will not result in the configure option failing.
-The `:fail` option defaults to `true` if the `:set_define` option is not
-defined, and defaults to `false` if the `:set_define` option is defined.
-
-##### `:set_define`
-
-If set, a build define of the specified String will be added to the
-`CPPDEFINES` construction variable array if the requested library is found.
-
 ##### `:use`
 
 If not set, the library will be used by default in all `Environment` objects.
@@ -387,18 +549,6 @@ used to look for package configuration flags for the specified package.
 If the `:program` option is given, the program specified will be used to look
 for configuration flags.
 
-##### `:fail`
-
-If the `:fail` option is set to `false`, then the absence of the package or
-program requested will not result in the configure option failing.
-The `:fail` option defaults to `true` if the `:set_define` option is not
-defined, and defaults to `false` if the `:set_define` option is defined.
-
-##### `:set_define`
-
-If set, a build define of the specified String will be added to the
-`CPPDEFINES` construction variable array if the requested package is found.
-
 ##### `:use`
 
 If not set, the library will be used by default in all `Environment` objects.
@@ -457,6 +607,46 @@ configure do
 end
 ```
 
+###> Global Configuration Check Options
+
+#### `:fail`
+
+If the `:fail` option is set to `false`, then the absence of the package or
+program requested will not result in the configure option failing.
+The `:fail` option defaults to `true` if the `:set_define` option is not
+defined, and defaults to `false` if the `:set_define` option is defined.
+
+#### `:on_fail`
+
+The `:on_fail` option can be set to a String or a Proc object. If the
+configuration operation fails (or would fail), the given message is printed
+or the Proc is called.
+
+Examples:
+
+```ruby
+configure do
+  check_c_compiler "special-gcc", on_fail: "First install special gcc!"
+end
+
+configure do
+  package_hint = lambda do
+    puts "The following packages must be installed to build this project:"
+    puts "- libsdl2-dev"
+    puts "- libsdl2-image-dev"
+    puts "- libsdl2-net-dev"
+  end
+  check_lib "SDL2", on_fail: package_hint
+  check_lib "SDL2_image", on_fail: package_hint
+  check_lib "SDL2_net", on_fail: package_hint
+end
+```
+
+#### `:set_define`
+
+If set, a build define of the specified String will be added to the
+`CPPDEFINES` construction variable array if the requested package is found.
+
 ##> Build Operations
 
 The `build` block is used to create Environments and register build targets.
@@ -479,21 +669,26 @@ source files found recursively under the `src` directory.
 
 An Environment includes:
 
+  - a name
   - a collection of construction variables
   - a collection of build hooks
   - a collection of user-registered build targets
   - a build root
 
 All build targets must be registered within an `Environment`.
+If the user does not specify a name for the environment, a name will be
+automatically generated based on the Environment's internal ID, for example
+"e.1".
 The Environment's build root is a directory created within the top-level
 Rscons build directory.
+It is based on the Environment name.
 By default it holds all intermediate files generated by Rscons that are needed
 to produce a user-specified build target.
 For example, for the `Rsconscript`:
 
 ```ruby
 build do
-  Environment.new do |env|
+  Environment.new(name: "myproj") do |env|
     env.Program("myprog.exe", glob("src/**/*.c"))
   end
 end
@@ -501,28 +696,11 @@ end
 
 Rscons will place an object file and dependency file corresponding to each C
 source file under the Environment's build root.
+Assuming a top-level build directory of "build", the Environment's build root
+would be "build/myproj".
 This keeps the intermediate generated build artifacts separate from the source
 files.
 
-###> Specifying Source Files: The glob Method
-
-The [`glob`](../yard/Rscons/Script/Dsl.html#glob-instance_method) method can be
-used to find files matching the patterns specified.
-It supports a syntax similar to the Ruby [Dir.glob method](https://ruby-doc.org/core-2.5.1/Dir.html#method-c-glob) but operates more deterministically.
-
-Example use:
-
-```ruby
-build do
-  Environment.new do |env|
-    env.Program("mytests", glob("src/**/*.cc", "test/**/*.cc"))
-  end
-end
-```
-
-This example would build the `mytests` executable from all `.cc` source files
-found recursively under the `src` or `test` directory.
-
 ###> Construction Variables
 
 Construction variables are values assigned to keys within an Environment.
@@ -593,20 +771,33 @@ There are several default builders that are built-in to Rscons:
     library.
   * `SharedObject`, which compiles source files to produce an object file, in a
     way that is able to be used to create a shared library.
+  * `Size`, which runs the 'size' utility on an executable file.
 
 ####> The Command Builder
 
 ```ruby
 env.Command(target, sources, "CMD" => command)
 # Example
-env.Command("docs.html", "docs.md",
+env.Command("user_guide.html", "user_guide.md",
   "CMD" => ["pandoc", "-fmarkdown", "-thtml", "-o${_TARGET}", "${_SOURCES}"],
-  "CMD_DESC" => "PANDOC")
+  "CMD_DESC" => "Generating user guide:")
 ```
 
 The `Command` builder executes a user-defined command in order to produce the
 desired target file based on the provided source files.
 
+The `Command` builder supports the following construction variables:
+
+  * `CMD` (required) specifies the command to execute (an array of strings).
+    `CMD` is expanded for variable references, so the tokens `${_TARGET}` and
+    `${_SOURCES}` can be used, for example.
+  * `CMD_DESC` (optional) specifies the short text description to print when
+    the builder executes. The given description is followed by the target file
+    name.
+  * `CMD_STDOUT` (optional) specifies a file to redirect standard output to.
+    `CMD_STDOUT` is expanded for variable references, so the token `${_TARGET}`
+    can be used, for example.
+
 ####> The CFile Builder
 
 ```ruby
@@ -796,6 +987,36 @@ allows it to be used to create a shared library are added.
 Although it can be called explicitly, it is more commonly implicitly called by
 the `SharedLibrary` builder.
 
+####> The Size Builder
+
+```ruby
+env.Size(target, sources)
+# Example
+env.Program("program.exe", glob("*.c"))
+env.Size("program.size", "program.exe")
+```
+
+The `Size` builder runs the "size" executable on the given source file and
+stores its output in the target file.
+The size executable can be specified with the `SIZE` construction variable,
+and flags can be specified with `SIZEFLAGS`.
+
+###> Phony Targets
+
+rscons supports phony build targets.
+Normally, a builder produces an output file, and executes whenever the input
+files or command have changed.
+A phony build target can be used to register a builder that does not produce
+an output file.
+A custom builder can take some action when the input files change even if it
+does not produce an output file.
+Such a builder could perform verification or run a test on its source files,
+possibly failing if some conditions are not met.
+It could also simply output something to the console, such as an analysis of
+the source file, whenever it changes.
+A phony target is signified by passing a Symbol instead of a String as the
+first parameter (target) to a builder method.
+
 ###> Explicit Dependencies
 
 A target can be marked as depending on another file that Rscons would not

lib/rscons.rb

@@ -33,10 +33,11 @@ module Rscons
     :Program,
     :SharedLibrary,
     :SharedObject,
+    :Size,
   ]
 
-  # Class to represent a fatal error while building a target.
-  class BuildError < RuntimeError; end
+  # Class to represent a fatal error during an Rscons operation.
+  class RsconsError < RuntimeError; end
 
   class << self
 
@@ -81,7 +82,7 @@ module Rscons
           end
           if ENV["SHELL"] and ENV["SHELL"] != "" and test_shell[ENV["SHELL"], "-c"]
             [ENV["SHELL"], "-c"]
-          elsif Object.const_get("RUBY_PLATFORM") =~ /mingw/
+          elsif Object.const_get("RUBY_PLATFORM") =~ /mingw|msys/
             if test_shell["sh", "-c"]
               # Using Rscons from MSYS should use MSYS's shell.
               ["sh", "-c"]
@@ -102,7 +103,7 @@ module Rscons
     # @return [Array<String>] Command used to execute commands.
     def command_executer
       @command_executer ||=
-        if Object.const_get("RUBY_PLATFORM") =~ /mingw/
+        if Object.const_get("RUBY_PLATFORM") =~ /mingw|msys/
           if ENV.keys.find {|key| key =~ /MSYS/}
             begin
               if IO.popen(["env", "echo", "success"]) {|io| io.read.strip} == "success"
@@ -146,6 +147,7 @@ require_relative "rscons/builders/program"
 require_relative "rscons/builders/shared_library"
 require_relative "rscons/builders/shared_object"
 require_relative "rscons/builders/simple_builder"
+require_relative "rscons/builders/size"
 
 # language support
 require_relative "rscons/builders/lang/asm"

lib/rscons/ansi.rb

@@ -84,7 +84,7 @@ module Rscons
       # @return [Boolean]
       #   Whether to output ANSI color escape codes.
       def do_ansi?(io)
-        if RUBY_PLATFORM =~ /mingw/
+        if RUBY_PLATFORM =~ /mingw|msys/
           (ENV["TERM"] == "xterm") && %w[fifo characterSpecial].include?(io.stat.ftype)
         else
           io.tty?

lib/rscons/application.rb

@@ -5,6 +5,10 @@ module Rscons
   # Functionality for an instance of the rscons application invocation.
   class Application
 
+    # @return [String]
+    #   Top-level build directory.
+    attr_accessor :build_dir
+
     # @return [Boolean]
     #   Whether to output ANSI color escape sequences.
     attr_accessor :do_ansi_color
@@ -23,6 +27,8 @@ module Rscons
 
     # Create Application instance.
     def initialize
+      @build_dir = ENV["RSCONS_BUILD_DIR"] || "build"
+      ENV.delete("RSCONS_BUILD_DIR")
       @n_threads = Util.determine_n_threads
       @vars = VarSet.new
       @operations = Set.new
@@ -136,8 +142,8 @@ module Rscons
           env.process
         end
         0
-      rescue BuildError => be
-        Ansi.write($stderr, :red, be.message, :reset, "\n")
+      rescue RsconsError => e
+        Ansi.write($stderr, :red, e.message, :reset, "\n")
         1
       end
     end
@@ -171,11 +177,8 @@ module Rscons
     #   Exit code.
     def distclean
       cache = Cache.instance
-      build_dir = cache["configuration_data"]["build_dir"]
       clean
-      if build_dir
-        FileUtils.rm_rf(build_dir)
-      end
+      FileUtils.rm_rf(@build_dir)
       cache.clear
       0
     end
@@ -193,7 +196,10 @@ module Rscons
       co = ConfigureOp.new(options)
       begin
         @script.configure(co)
-      rescue ConfigureOp::ConfigureFailure
+      rescue RsconsError => e
+        if e.message and e.message != ""
+          $stderr.puts e.message
+        end
         Ansi.write($stderr, :red, "Configuration failed", :reset, "\n")
         rv = 1
       end

lib/rscons/builders/mixins/object.rb

@@ -75,10 +75,10 @@ module Rscons
             @vars["_SOURCES"] = @sources
             depfilesuffix = @env.expand_varref("${DEPFILESUFFIX}", vars)
             @vars["_DEPFILE"] =
-              if @vars[:direct]
-                @env.get_build_fname(target, depfilesuffix, self.class)
+              if @vars[:direct] || !@target.start_with?("#{@env.build_root}/")
+                @env.get_build_fname(@target, depfilesuffix, self.class)
               else
-                "#{target}#{depfilesuffix}"
+                "#{@target}#{depfilesuffix}"
               end
             @cache.mkdir_p(File.dirname(@vars["_DEPFILE"]))
             command = @env.build_command(@command_template, @vars)

lib/rscons/builders/size.rb

@@ -0,0 +1,24 @@
+module Rscons
+  module Builders
+    # Run the "size" utility on an executable and store its results in the
+    # target file.
+    # input file.
+    #
+    # Examples::
+    #   env.Size("^/project.size", "^/project.elf")
+    class Size < Builder
+
+      # Run the builder to produce a build target.
+      def run(options)
+        if @command
+          finalize_command
+        else
+          @vars["_SOURCES"] = @sources
+          command = @env.build_command("${SIZECMD}", @vars)
+          standard_command("Size <source>#{Util.short_format_paths(@sources)}<reset> => <target>#{@target}<reset>", command, stdout: @target)
+        end
+      end
+
+    end
+  end
+end

lib/rscons/cache.rb

@@ -51,9 +51,6 @@ module Rscons
   #   }
   class Cache
 
-    # Name of the file to store cache information in
-    CACHE_FILE = ".rsconscache"
-
     # Prefix for phony cache entries.
     PHONY_PREFIX = ":PHONY:"
 
@@ -70,6 +67,11 @@ module Rscons
       initialize!
     end
 
+    # Get the path to the cache file.
+    def cache_file
+      File.join(Rscons.application.build_dir, ".rsconscache")
+    end
+
     # Access cache value.
     def [](key)
       @cache[key]
@@ -84,7 +86,7 @@ module Rscons
     #
     # @return [void]
     def clear
-      FileUtils.rm_f(CACHE_FILE)
+      FileUtils.rm_f(cache_file)
       initialize!
     end
 
@@ -100,7 +102,7 @@ module Rscons
     # @return [void]
     def write
       @cache["version"] = VERSION
-      File.open(CACHE_FILE, "w") do |fh|
+      File.open(cache_file, "w") do |fh|
         fh.puts(JSON.dump(@cache))
       end
     end
@@ -360,9 +362,9 @@ module Rscons
     # Create a Cache object and load in the previous contents from the cache
     # file.
     def initialize!
-      @cache = JSON.load(File.read(CACHE_FILE)) rescue {}
+      @cache = JSON.load(File.read(cache_file)) rescue {}
       unless @cache.is_a?(Hash)
-        $stderr.puts "Warning: #{CACHE_FILE} was corrupt. Contents:\n#{@cache.inspect}"
+        $stderr.puts "Warning: #{cache_file} was corrupt. Contents:\n#{@cache.inspect}"
         @cache = {}
       end
       @cache["targets"] ||= {}

lib/rscons/cli.rb

@@ -6,11 +6,14 @@ USAGE = <<EOF
 Usage: #{$0} [global options] [operation] [operation options]
 
 Global options:
+  -b BUILD, --build=BUILD     Set build directory (default: build)
+  -f FILE                     Use FILE as Rsconscript
   -F, --show-failure          Show failed command log from previous build and exit
-  --version                   Show rscons version and exit
   -h, --help                  Show rscons help and exit
+  -j N, --nthreads=N          Set number of threads (local default: #{Rscons.application.n_threads})
   -r COLOR, --color=COLOR     Set color mode (off, auto, force)
   -v, --verbose               Run verbosely
+  --version                   Show rscons version and exit
 
 Operations:
   configure                   Configure the project
@@ -21,12 +24,7 @@ Operations:
   uninstall                   Uninstall project from installation destination
 
 Configure options:
-  -b BUILD, --build=BUILD     Set build directory (default: build)
   --prefix=PREFIX             Set installation prefix (default: /usr/local)
-
-Build options:
-  -j N, --nthreads=N          Set number of threads (local default: #{Rscons.application.n_threads})
-
 EOF
 
 module Rscons
@@ -58,6 +56,10 @@ module Rscons
       private
 
       def add_global_options(opts)
+        opts.on("-b", "--build DIR") do |build_dir|
+          Rscons.application.build_dir = build_dir
+        end
+
         opts.on("-j NTHREADS") do |n_threads|
           Rscons.application.n_threads = n_threads.to_i
         end
@@ -158,10 +160,6 @@ module Rscons
       end
 
       def parse_configure_args(opts, argv, options)
-        opts.on("-b", "--build DIR") do |build_dir|
-          options[:build_dir] = build_dir
-        end
-
         opts.on("--prefix PREFIX") do |prefix|
           options[:prefix] = prefix
         end

lib/rscons/configure_op.rb

@@ -5,37 +5,29 @@ module Rscons
   # Class to manage a configure operation.
   class ConfigureOp
 
-    # Exception raised when a configuration error occurs.
-    class ConfigureFailure < Exception; end
-
     # Create a ConfigureOp.
     #
     # @param options [Hash]
     #   Optional parameters.
-    # @option options [String] :build_dir
-    #   Build directory.
     # @option options [String] :prefix
     #   Install prefix.
     # @option options [String] :project_name
     #   Project name.
     def initialize(options)
       # Default options.
-      options[:build_dir] ||= "build"
       options[:prefix] ||= "/usr/local"
-      @work_dir = "#{options[:build_dir]}/configure"
+      @work_dir = "#{Rscons.application.build_dir}/_configure"
       FileUtils.mkdir_p(@work_dir)
       @log_fh = File.open("#{@work_dir}/config.log", "wb")
       cache = Cache.instance
       cache["failed_commands"] = []
       cache["configuration_data"] = {}
-      cache["configuration_data"]["build_dir"] = options[:build_dir]
       cache["configuration_data"]["prefix"] = options[:prefix]
       if project_name = options[:project_name]
         Ansi.write($stdout, "Configuring ", :cyan, project_name, :reset, "...\n")
       else
         $stdout.puts "Configuring project..."
       end
-      Ansi.write($stdout, "Setting build directory... ", :green, options[:build_dir], :reset, "\n")
       Ansi.write($stdout, "Setting prefix... ", :green, options[:prefix], :reset, "\n")
       store_merge("prefix" => options[:prefix])
     end
@@ -62,6 +54,10 @@ module Rscons
     # @return [void]
     def check_c_compiler(*ccc)
       $stdout.write("Checking for C compiler... ")
+      options = {}
+      if ccc.last.is_a?(Hash)
+        options = ccc.slice!(-1)
+      end
       if ccc.empty?
         # Default C compiler search array.
         ccc = %w[gcc clang]
@@ -69,7 +65,7 @@ module Rscons
       cc = ccc.find do |cc|
         test_c_compiler(cc)
       end
-      complete(cc ? 0 : 1, success_message: cc)
+      complete(cc ? 0 : 1, options.merge(success_message: cc))
     end
 
     # Check for a working C++ compiler.
@@ -80,6 +76,10 @@ module Rscons
     # @return [void]
     def check_cxx_compiler(*ccc)
       $stdout.write("Checking for C++ compiler... ")
+      options = {}
+      if ccc.last.is_a?(Hash)
+        options = ccc.slice!(-1)
+      end
       if ccc.empty?
         # Default C++ compiler search array.
         ccc = %w[g++ clang++]
@@ -87,7 +87,7 @@ module Rscons
       cc = ccc.find do |cc|
         test_cxx_compiler(cc)
       end
-      complete(cc ? 0 : 1, success_message: cc)
+      complete(cc ? 0 : 1, options.merge(success_message: cc))
     end
 
     # Check for a working D compiler.
@@ -98,6 +98,10 @@ module Rscons
     # @return [void]
     def check_d_compiler(*cdc)
       $stdout.write("Checking for D compiler... ")
+      options = {}
+      if cdc.last.is_a?(Hash)
+        options = cdc.slice!(-1)
+      end
       if cdc.empty?
         # Default D compiler search array.
         cdc = %w[gdc ldc2]
@@ -105,7 +109,7 @@ module Rscons
       dc = cdc.find do |dc|
         test_d_compiler(dc)
       end
-      complete(dc ? 0 : 1, success_message: dc)
+      complete(dc ? 0 : 1, options.merge(success_message: dc))
     end
 
     # Check for a package or configure program output.
@@ -387,11 +391,15 @@ module Rscons
           else
             !options[:set_define]
           end
+        color = should_fail ? :red : :yellow
+        Ansi.write($stdout, color, "#{fail_message}\n")
+        if options[:on_fail].is_a?(String)
+          $stdout.puts(options[:on_fail])
+        elsif options[:on_fail].is_a?(Proc)
+          options[:on_fail].call
+        end
         if should_fail
-          Ansi.write($stdout, :red, "#{fail_message}\n")
-          raise ConfigureFailure.new
-        else
-          Ansi.write($stdout, :yellow, "#{fail_message}\n")
+          raise RsconsError.new
         end
       end
     end
@@ -408,22 +416,17 @@ module Rscons
     def test_c_compiler(cc)
       File.open("#{@work_dir}/cfgtest.c", "wb") do |fh|
         fh.puts <<-EOF
-          #include <stdio.h>
-          int main(int argc, char * argv[]) {
-            printf("Success.\\n");
-            return 0;
+          int fun(int val) {
+            return val * 2;
           }
         EOF
       end
-      command = %W[#{cc} -o #{@work_dir}/cfgtest.exe #{@work_dir}/cfgtest.c]
+      command = %W[#{cc} -c -o #{@work_dir}/cfgtest.o #{@work_dir}/cfgtest.c]
       merge = {"CC" => cc}
       _, _, status = log_and_test_command(command)
       if status == 0
-        stdout, _, status = log_and_test_command(["#{@work_dir}/cfgtest.exe"])
-        if status == 0 and stdout =~ /Success/
-          store_merge(merge)
-          true
-        end
+        store_merge(merge)
+        true
       end
     end
 
@@ -437,23 +440,18 @@ module Rscons
     def test_cxx_compiler(cc)
       File.open("#{@work_dir}/cfgtest.cxx", "wb") do |fh|
         fh.puts <<-EOF
-          #include <iostream>
-          using namespace std;
-          int main(int argc, char * argv[]) {
-            cout << "Success." << endl;
-            return 0;
+          template<typename T>
+          T fun(T val) {
+            return val * 2;
           }
         EOF
       end
-      command = %W[#{cc} -o #{@work_dir}/cfgtest.exe #{@work_dir}/cfgtest.cxx]
+      command = %W[#{cc} -c -o #{@work_dir}/cfgtest.o #{@work_dir}/cfgtest.cxx]
       merge = {"CXX" => cc}
       _, _, status = log_and_test_command(command)
       if status == 0
-        stdout, _, status = log_and_test_command(["#{@work_dir}/cfgtest.exe"])
-        if status == 0 and stdout =~ /Success/
-          store_merge(merge)
-          true
-        end
+        store_merge(merge)
+        true
       end
     end
 
@@ -467,9 +465,8 @@ module Rscons
     def test_d_compiler(dc)
       File.open("#{@work_dir}/cfgtest.d", "wb") do |fh|
         fh.puts <<-EOF
-          import std.stdio;
-          int main() {
-            writeln("Success.");
+          import core.math;
+          int fun() {
             return 0;
           }
         EOF
@@ -477,29 +474,25 @@ module Rscons
       [:gdc, :ldc2].find do |dc_test|
         case dc_test
         when :gdc
-          command = %W[#{dc} -o #{@work_dir}/cfgtest.exe #{@work_dir}/cfgtest.d]
+          command = %W[#{dc} -c -o #{@work_dir}/cfgtest.o #{@work_dir}/cfgtest.d]
           merge = {"DC" => dc}
         when :ldc2
-          command = %W[#{dc} -of #{@work_dir}/cfgtest.exe #{@work_dir}/cfgtest.d]
+          # ldc2 on Windows expect an object file suffix of .obj.
+          ldc_objsuffix = RUBY_PLATFORM =~ /mingw|msys/ ? ".obj" : ".o"
+          command = %W[#{dc} -c -of #{@work_dir}/cfgtest#{ldc_objsuffix} #{@work_dir}/cfgtest.d]
           env = BasicEnvironment.new
           merge = {
             "DC" => dc,
-            "DCCMD" => env["DCCMD"].map {|e| if e == "-o"; "-of"; else; e; end},
-            "LDCMD" => env["LDCMD"].map {|e| if e == "-o"; "-of"; else; e; end},
+            "DCCMD" => env["DCCMD"].map {|e| e.sub(/^-o$/, "-of")},
+            "LDCMD" => env["LDCMD"].map {|e| e.sub(/^-o$/, "-of")},
             "DDEPGEN" => ["-deps=${_DEPFILE}"],
           }
-          if RUBY_PLATFORM =~ /mingw/
-            # ldc2 on Windows expect an object file suffix of .obj.
-            merge["OBJSUFFIX"] = %w[.obj]
-          end
+          merge["OBJSUFFIX"] = [ldc_objsuffix]
         end
         _, _, status = log_and_test_command(command)
         if status == 0
-          stdout, _, status = log_and_test_command(["#{@work_dir}/cfgtest.exe"])
-          if status == 0 and stdout =~ /Success/
-            store_merge(merge)
-            true
-          end
+          store_merge(merge)
+          true
         end
       end
     end

lib/rscons/default_construction_variables.rb

@@ -1,6 +1,6 @@
 module Rscons
 
-  on_windows = RUBY_PLATFORM =~ /mingw|cygwin/
+  on_windows = RUBY_PLATFORM =~ /mingw|msys|cygwin/
   pic_flags = on_windows ? [] : %w[-fPIC]
 
   # Default Rscons construction variables.
@@ -80,6 +80,9 @@ module Rscons
     "SHLIBLINKPREFIX" => "-l",
     "SHLIBPREFIX" => on_windows ? "" : "lib",
     "SHLIBSUFFIX" => on_windows ? ".dll" : ".so",
+    "SIZE" => "size",
+    "SIZECMD" => %w[${SIZE} ${SIZEFLAGS} ${_SOURCES}],
+    "SIZEFLAGS" => [],
     "YACC" => "bison",
     "YACCSUFFIX" => %w[.y .yy],
     "YACC_CMD" => %w[${YACC} ${YACC_FLAGS} -o ${_TARGET} ${_SOURCES}],

lib/rscons/environment.rb

@@ -1,7 +1,6 @@
 require "fileutils"
 require "set"
 require "shellwords"
-require "thwait"
 
 module Rscons
   # The Environment class is the main programmatic interface to Rscons. It
@@ -52,6 +51,10 @@ module Rscons
     #   global Rscons.application.n_threads value.
     attr_accessor :n_threads
 
+    # @return [String]
+    #   Environment name.
+    attr_reader :name
+
     # Create an Environment object.
     #
     # @param options [Hash]
@@ -59,6 +62,9 @@ module Rscons
     #   :command, :short, or :off (default :short)
     # @option options [Boolean] :exclude_builders
     #   Whether to omit adding default builders (default false)
+    # @option options [String, nil] :name
+    #   Environment name. This determines the folder name used to store all
+    #   environment build files under the top-level build directory.
     # @option options [String, Array<String>] :use
     #   Use flag(s). If specified, any configuration flags which were saved
     #   with a corresponding `:use` value will be applied to this Environment.
@@ -98,7 +104,8 @@ module Rscons
         else
           :short
         end
-      @build_root = "#{Cache.instance["configuration_data"]["build_dir"]}/e.#{@id}"
+      @name = options[:name] || "e.#{@id}"
+      @build_root = "#{Rscons.application.build_dir}/#{@name}"
       @n_threads = Rscons.application.n_threads
 
       if block_given?
@@ -126,14 +133,14 @@ module Rscons
     #
     # @return [Environment] The newly created {Environment} object.
     def clone(options = {})
+      options = options.dup
       clone = options[:clone] || :all
       clone = Set[:variables, :builders, :build_hooks] if clone == :all
       clone = Set[] if clone == :none
       clone = Set.new(clone) if clone.is_a?(Array)
       clone.delete(:builders) if options[:exclude_builders]
-      env = self.class.new(
-        echo: options[:echo] || @echo,
-        exclude_builders: true)
+      options[:echo] ||= @echo
+      env = self.class.new(options.merge(exclude_builders: true))
       if clone.include?(:builders)
         @builders.each do |builder_name, builder|
           env.add_builder(builder)
@@ -287,9 +294,9 @@ module Rscons
       unless @process_failures.empty?
         msg = @process_failures.join("\n")
         if Cache.instance["failed_commands"].size > 0
-          msg += "\nUse -F to view the failed command log from the previous build operation"
+          msg += "\nUse `#{Util.command_to_execute_me} -F` to view the failed command log from the previous build operation"
         end
-        raise BuildError.new(msg)
+        raise RsconsError.new(msg)
       end
     end
 
@@ -347,12 +354,12 @@ module Rscons
       if target.is_a?(Builder)
         target = target.target
       end
-      target = expand_varref(target.to_s)
+      target = expand_path(expand_varref(target.to_s))
       user_deps = user_deps.map do |ud|
         if ud.is_a?(Builder)
           ud = ud.target
         end
-        expand_varref(ud)
+        expand_path(expand_varref(ud))
       end
       @user_deps[target] ||= []
       @user_deps[target] = (@user_deps[target] + user_deps).uniq
@@ -468,10 +475,12 @@ module Rscons
       output_fname
     end
 
-    # Expand a path to be relative to the Environment's build root.
+    # Expand paths.
     #
     # Paths beginning with "^/" are expanded by replacing "^" with the
-    # Environment's build root.
+    # Environment's build root (e.g. "build/envname").
+    # Paths beginning with "^^/" are expanded by replacing "^^" with the
+    # top-level build directory (e.g. "build").
     #
     # @param path [String, Array<String>]
     #   The path(s) to expand.
@@ -486,7 +495,7 @@ module Rscons
           expand_path(path)
         end
       else
-        path.sub(%r{^\^(?=[\\/])}, @build_root).gsub("\\", "/")
+        path.sub(%r{^\^\^(?=[\\/])}, Rscons.application.build_dir).sub(%r{^\^(?=[\\/])}, @build_root).gsub("\\", "/")
       end
     end
 
@@ -702,10 +711,7 @@ module Rscons
           !thread.alive?
         end
       else
-        if @threads.empty?
-          raise "No threads to wait for"
-        end
-        ThreadsWait.new(*@threads.keys).next_wait
+        Util.wait_for_thread(*@threads.keys)
       end
     end
 

lib/rscons/script.rb

@@ -3,32 +3,8 @@ module Rscons
   # The Script class encapsulates the state of a build script.
   class Script
 
-    # DSL available to the Rsconscript.
-    class Dsl
-      # Create a Dsl.
-      def initialize(script)
-        @script = script
-      end
-
-      # Set the project name.
-      def project_name(project_name)
-        @script.project_name = project_name
-      end
-
-      # Whether to automatically configure (default true).
-      def autoconf(autoconf)
-        @script.autoconf = autoconf
-      end
-
-      # Enter build block.
-      def build(&block)
-        @script.operations["build"] = block
-      end
-
-      # Enter configuration block.
-      def configure(&block)
-        @script.operations["configure"] = block
-      end
+    # Global DSL methods.
+    class GlobalDsl
 
       # Return a list of paths matching the specified pattern(s).
       #
@@ -56,10 +32,194 @@ module Rscons
           end
         end.sort
       end
+
+      # Return path components from the PATH variable.
+      #
+      # @return [Array<String>]
+      #   Path components from the PATH variable.
+      def path_components
+        ENV["PATH"].split(File::PATH_SEPARATOR)
+      end
+
+      # Prepend a path component to the PATH variable.
+      #
+      # @param path [String]
+      #   Path to prepend.
+      #
+      # @return [void]
+      def path_prepend(path)
+        path_set([File.expand_path(path)] + path_components)
+      end
+
+      # Append a path component to the PATH variable.
+      #
+      # @param path [String]
+      #   Path to append.
+      #
+      # @return [void]
+      def path_append(path)
+        path_set(path_components + [File.expand_path(path)])
+      end
+
+      # Set the PATH variable.
+      #
+      # @param new_path [String, Array<String>]
+      #   New PATH variable value as an array or string.
+      #
+      # @return [void]
+      def path_set(new_path)
+        if new_path.is_a?(Array)
+          new_path = new_path.join(File::PATH_SEPARATOR)
+        end
+        ENV["PATH"] = new_path
+      end
+
+      # Invoke rscons in a subprocess for a subsidiary Rsconscript file.
+      #
+      # @param path [String]
+      #   Path to subsidiary Rsconscript to execute, or path to subsidiary
+      #   directory to run rscons in.
+      # @param args[Array<String>]
+      #   Arguments to pass to rscons subprocess.
+      def rscons(path, *args)
+        rscons_path = File.expand_path($0)
+        path = File.expand_path(path)
+        if File.directory?(path)
+          command = [*args]
+          dir = path
+        else
+          command = ["-f", path, *args]
+          dir = File.dirname(path)
+        end
+        if File.exist?("#{dir}/rscons")
+          rscons_path = "#{dir}/rscons"
+        end
+        command = [rscons_path] + command
+        print_dir = dir != "." && dir != File.expand_path(Dir.pwd)
+        if ENV["specs"] and not ENV["dist_specs"] # specs
+          command = ["ruby", $LOAD_PATH.map {|p| ["-I", p]}, command].flatten # specs
+        end # specs
+        puts "rscons: Entering directory '#{dir}'" if print_dir
+        result = system(*command, chdir: dir)
+        puts "rscons: Leaving directory '#{dir}'" if print_dir
+        unless result
+          raise RsconsError.new("Failed command: " + command.join(" "))
+        end
+      end
+
+      # Execute a shell command, exiting on failure.
+      # The behavior to exit on failure is suppressed if the +:continue+
+      # option is given.
+      #
+      # @overload sh(command, options = {})
+      #   @param command [String, Array<String>]
+      #     Command to execute. The command is executed and interpreted by the
+      #     system shell when given as a single string. It is not passed to the
+      #     system shell if the array size is greater than 1.
+      #   @param options [Hash]
+      #     Options.
+      #   @option options [Boolean] :continue
+      #     If set to +true+, rscons will continue executing afterward, even if
+      #     the command fails.
+      #
+      # @overload sh(*command, options = {})
+      #   @param command [String, Array<String>]
+      #     Command to execute. The command is executed and interpreted by the
+      #     system shell when given as a single string. It is not passed to the
+      #     system shell if the array size is greater than 1.
+      #   @param options [Hash]
+      #     Options.
+      #   @option options [Boolean] :continue
+      #     If set to +true+, rscons will continue executing afterward, even if
+      #     the command fails.
+      def sh(*command)
+        options = {}
+        if command.last.is_a?(Hash)
+          options = command.slice!(-1)
+        end
+        if command.size == 1 && command[0].is_a?(Array)
+          command = command[0]
+        end
+        if Rscons.application.verbose
+          if command.size > 1
+            puts Util.command_to_s(command)
+          else
+            puts command[0]
+          end
+        end
+        begin
+          system(*command, exception: true)
+        rescue StandardError => e
+          message = "#{e.backtrace[2]}: #{e.message}"
+          if options[:continue]
+            Ansi.write($stderr, :red, message, :reset, "\n")
+          else
+            raise RsconsError.new(message)
+          end
+        end
+      end
+
+      [
+        :cd,
+        :chmod,
+        :chmod_R,
+        :chown,
+        :chown_R,
+        :cp,
+        :cp_lr,
+        :cp_r,
+        :install,
+        :ln,
+        :ln_s,
+        :ln_sf,
+        :mkdir,
+        :mkdir_p,
+        :mv,
+        :pwd,
+        :rm,
+        :rm_f,
+        :rm_r,
+        :rm_rf,
+        :rmdir,
+        :touch,
+      ].each do |method|
+        define_method(method) do |*args, **kwargs, &block|
+          FileUtils.__send__(method, *args, **kwargs, &block)
+        end
+      end
+
+    end
+
+    # Top-level DSL available to the Rsconscript.
+    class Dsl < GlobalDsl
+      # Create a Dsl.
+      def initialize(script)
+        @script = script
+      end
+
+      # Set the project name.
+      def project_name(project_name)
+        @script.project_name = project_name
+      end
+
+      # Whether to automatically configure (default true).
+      def autoconf(autoconf)
+        @script.autoconf = autoconf
+      end
+
+      # Enter build block.
+      def build(&block)
+        @script.operations["build"] = block
+      end
+
+      # Enter configuration block.
+      def configure(&block)
+        @script.operations["configure"] = block
+      end
     end
 
     # DSL available to the 'configure' block.
-    class ConfigureDsl
+    class ConfigureDsl < GlobalDsl
       # Create a ConfigureDsl.
       #
       # @param configure_op [ConfigureOp]

lib/rscons/util.rb

@@ -9,7 +9,7 @@ module Rscons
       #
       # @return [Boolean] Whether the given path is an absolute filesystem path.
       def absolute_path?(path)
-        if RUBY_PLATFORM =~ /mingw/
+        if RUBY_PLATFORM =~ /mingw|msys/
           path =~ %r{^(?:\w:)?[\\/]}
         else
           path.start_with?("/")
@@ -48,7 +48,7 @@ module Rscons
       # @return [String]
       #   The string representation of the command.
       def command_to_s(command)
-        command.map { |c| c =~ /\s/ ? "'#{c}'" : c }.join(' ')
+        command.map { |c| c[" "] ? "'#{c.gsub("'", "'\\\\''")}'" : c }.join(" ")
       end
 
       # Determine the number of threads to use by default.
@@ -68,8 +68,8 @@ module Rscons
           case RbConfig::CONFIG["host_os"]
           when /linux/
             return File.read("/proc/cpuinfo").scan(/^processor\s*:/).size
-          when /mswin|mingw/
-            if `wmic cpu get NumberOfLogicalProcessors /value` =~ /NumberOfLogicalProcessors=(\d+)/
+          when /mswin|mingw|msys/
+            if `wmic cpu get NumberOfLogicalProcessors -value` =~ /NumberOfLogicalProcessors=(\d+)/
               return $1.to_i
             end
           when /darwin/
@@ -191,6 +191,40 @@ module Rscons
         deps
       end
 
+      # Wait for any of a number of threads to complete.
+      #
+      # @param threads [Array<Thread>]
+      #   Threads to wait for.
+      #
+      # @return [Thread]
+      #   The Thread that completed.
+      def wait_for_thread(*threads)
+        if threads.empty?
+          raise "No threads to wait for"
+        end
+        queue = Queue.new
+        threads.each do |thread|
+          # Create a wait thread for each thread we're waiting for.
+          Thread.new do
+            begin
+              thread.join
+            ensure
+              queue.push(thread)
+            end
+          end
+        end
+        # Wait for any thread to complete.
+        queue.pop
+      end
+
+      # Command that can be run to execute this instance of rscons from the
+      # current working directory.
+      def command_to_execute_me
+        command = Pathname.new(File.expand_path($0)).relative_path_from(Dir.pwd).to_s
+        command = "./#{command}" unless command["/"]
+        command
+      end
+
       private
 
       # Check if a directory contains a certain executable.
@@ -199,11 +233,14 @@ module Rscons
       #   Directory to look in.
       # @param executable [String]
       #   Executable to look for.
+      #
+      # @return [String, nil]
+      #   Executable found.
       def test_path_for_executable(path_entry, executable)
         is_executable = lambda do |path|
           File.file?(path) and File.executable?(path)
         end
-        if RbConfig::CONFIG["host_os"] =~ /mswin|windows|mingw/i
+        if RbConfig::CONFIG["host_os"] =~ /mswin|windows|mingw|msys/i
           if File.directory?(path_entry)
             executable = executable.downcase
             dir_entries = Dir.entries(path_entry)

lib/rscons/version.rb

@@ -1,4 +1,4 @@
 module Rscons
   # Project version.
-  VERSION = "2.0.2"
+  VERSION = "2.3.0"
 end

rb/build_dist.rb

@@ -44,7 +44,7 @@ combine_files[START_FILE]
 # Strip Ruby comment lines and empty lines to save some space, but do not
 # remove lines that are in heredoc sections. This isn't terribly robust to be
 # used in the wild, but works for the heredoc instances for this project.
-stripped_comments = []
+stripped = []
 heredoc_end = nil
 combined_file.each do |line|
   if line =~ /<<-?([A-Z]+)/
@@ -53,17 +53,20 @@ combined_file.each do |line|
   if heredoc_end and line =~ /^\s*#{heredoc_end}/
     heredoc_end = nil
   end
-  if heredoc_end or not (line =~ /^\s*(#[^!].*)?$/)
-    stripped_comments << line
+  if line !~ /#\sspecs/
+    if heredoc_end or line !~ /^\s*(#[^!].*)?$/
+      stripped << line
+    end
   end
 end
 
 require "zlib"
 require "base64"
-compressed_script = Zlib::Deflate.deflate(stripped_comments.join)
+compressed_script = Zlib::Deflate.deflate(stripped.join)
 encoded_compressed_script = Base64.encode64(compressed_script).gsub("\n", "")
 hash = Digest::MD5.hexdigest(encoded_compressed_script)
 
+FileUtils.rm_rf(DIST)
 FileUtils.mkdir_p(DIST)
 File.open("#{DIST}/#{PROG_NAME}", "wb", 0755) do |fh|
   fh.write(<<EOF)

spec/build_tests_spec.rb

@@ -55,6 +55,8 @@ describe Rscons do
     end
   end
 
+  let(:passenv) {{}}
+
   def test_dir(build_test_directory)
     Dir.chdir(@owd)
     rm_rf(@build_test_run_dir)
@@ -118,21 +120,23 @@ describe Rscons do
     command_name = "#{command_prefix}#{@statics[:build_test_id]}"
     File.open("_simplecov_setup.rb", "w") do |fh|
       fh.puts <<EOF
-require "bundler"
-Bundler.setup
-require "simplecov"
-class MyFormatter
-  def format(*args)
+unless ENV["dist_specs"]
+  require "bundler"
+  Bundler.setup
+  require "simplecov"
+  class MyFormatter
+    def format(*args)
+    end
   end
-end
-SimpleCov.start do
-  root(#{@owd.inspect})
-  command_name(#{command_name.inspect})
-  filters.clear
-  add_filter do |src|
-    !(src.filename[SimpleCov.root])
+  SimpleCov.start do
+    root(#{@owd.inspect})
+    command_name(#{command_name.inspect})
+    filters.clear
+    add_filter do |src|
+      !(src.filename[SimpleCov.root])
+    end
+    formatter(MyFormatter)
   end
-  formatter(MyFormatter)
 end
 # force color off
 ENV["TERM"] = nil
@@ -143,8 +147,9 @@ EOF
       end
     end
     stdout, stderr, status = nil, nil, nil
-    Bundler.with_clean_env do
+    Bundler.with_unbundled_env do
       env = ENV.to_h
+      env.merge!(passenv)
       path = ["#{@build_test_run_dir}/_bin", "#{env["PATH"]}"]
       if options[:path]
         path = Array(options[:path]) + path
@@ -187,6 +192,10 @@ EOF
     end
   end
 
+  def nr(str)
+    str.gsub("\r", "")
+  end
+
   ###########################################################################
   # Tests
   ###########################################################################
@@ -196,7 +205,24 @@ EOF
     result = run_rscons
     expect(result.stderr).to eq ""
     expect(File.exists?('build/e.1/simple.c.o')).to be_truthy
-    expect(`./simple.exe`).to eq "This is a simple C program\n"
+    expect(nr(`./simple.exe`)).to eq "This is a simple C program\n"
+  end
+
+  it "uses the build directory specified with -b" do
+    test_dir("simple")
+    result = run_rscons(rscons_args: %w[-b b])
+    expect(result.stderr).to eq ""
+    expect(Dir.exist?("build")).to be_falsey
+    expect(File.exists?("b/e.1/simple.c.o")).to be_truthy
+  end
+
+  it "uses the build directory specified by an environment variable" do
+    test_dir("simple")
+    passenv["RSCONS_BUILD_DIR"] = "b2"
+    result = run_rscons
+    expect(result.stderr).to eq ""
+    expect(Dir.exist?("build")).to be_falsey
+    expect(File.exists?("b2/e.1/simple.c.o")).to be_truthy
   end
 
   it "allows specifying a Builder object as the source to another build target" do
@@ -204,7 +230,7 @@ EOF
     result = run_rscons(rsconscript: "builder_as_source.rb")
     expect(result.stderr).to eq ""
     expect(File.exists?("simple.o")).to be_truthy
-    expect(`./simple.exe`).to eq "This is a simple C program\n"
+    expect(nr(`./simple.exe`)).to eq "This is a simple C program\n"
   end
 
   it 'prints commands as they are executed' do
@@ -232,18 +258,18 @@ EOF
     result = run_rscons
     expect(result.stderr).to eq ""
     expect(File.exists?('build/e.1/header.c.o')).to be_truthy
-    expect(`./header.exe`).to eq "The value is 2\n"
+    expect(nr(`./header.exe`)).to eq "The value is 2\n"
   end
 
   it 'rebuilds a C module when a header it depends on changes' do
     test_dir('header')
     result = run_rscons
     expect(result.stderr).to eq ""
-    expect(`./header.exe`).to eq "The value is 2\n"
+    expect(nr(`./header.exe`)).to eq "The value is 2\n"
     file_sub('header.h') {|line| line.sub(/2/, '5')}
     result = run_rscons
     expect(result.stderr).to eq ""
-    expect(`./header.exe`).to eq "The value is 5\n"
+    expect(nr(`./header.exe`)).to eq "The value is 5\n"
   end
 
   it 'does not rebuild a C module when its dependencies have not changed' do
@@ -254,7 +280,7 @@ EOF
       %r{Compiling header.c},
       %r{Linking header.exe},
     ])
-    expect(`./header.exe`).to eq "The value is 2\n"
+    expect(nr(`./header.exe`)).to eq "The value is 2\n"
     result = run_rscons
     expect(result.stderr).to eq ""
     expect(result.stdout).to eq ""
@@ -268,7 +294,7 @@ EOF
       %r{Compiling header.c},
       %r{Linking header.exe},
     ])
-    expect(`./header.exe`).to eq "The value is 2\n"
+    expect(nr(`./header.exe`)).to eq "The value is 2\n"
     sleep 0.05
     file_sub('header.c') {|line| line}
     result = run_rscons
@@ -312,14 +338,14 @@ EOF
     ]
   end
 
-  it "expands target and source paths starting with ^/ to be relative to the build root" do
+  it "expands target and source paths starting with ^/ and ^^/" do
     test_dir("typical")
-    result = run_rscons(rsconscript: "carat.rb")
+    result = run_rscons(rsconscript: "carat.rb", rscons_args: %w[-b bld])
     expect(result.stderr).to eq ""
     verify_lines(lines(result.stdout), [
-      %r{gcc -c -o build/e.1/one.o -MMD -MF build/e.1/one.o.mf -Isrc -Isrc/one -Isrc/two build/e.1/one.c},
-      %r{gcc -c -o build/e.1/src/two/two.c.o -MMD -MF build/e.1/src/two/two.c.o.mf -Isrc -Isrc/one -Isrc/two src/two/two.c},
-      %r{gcc -o program.exe build/e.1/src/two/two.c.o build/e.1/one.o},
+      %r{gcc -c -o bld/e.1/one.o -MMD -MF bld/e.1/one.o.mf -Isrc -Isrc/one -Isrc/two bld/e.1/one.c},
+      %r{gcc -c -o bld/e.1/bld/two.c.o -MMD -MF bld/e.1/bld/two.c.o.mf -Isrc -Isrc/one -Isrc/two bld/two.c},
+      %r{gcc -o bld/program.exe bld/e.1/one.o bld/e.1/bld/two.c.o},
     ])
   end
 
@@ -328,7 +354,7 @@ EOF
     result = run_rscons
     expect(result.stderr).to eq ""
     expect(File.exists?('foo.yml')).to be_truthy
-    expect(IO.read('foo.yml')).to eq("---\nkey: value\n")
+    expect(nr(IO.read('foo.yml'))).to eq("---\nkey: value\n")
   end
 
   it "raises an error when a side-effect file is registered for a build target that is not registered" do
@@ -337,20 +363,6 @@ EOF
     expect(result.stderr).to match /Could not find a registered build target "foo"/
   end
 
-  it "allows replacing a running executable when performing an 'install' operation" do
-    test_dir("install_running_exe")
-    result = run_rscons(op: "install")
-    expect(result.stderr).to eq ""
-    fcontents = File.read("program.c", mode: "rb")
-    File.open("program.c", "wb") do |fh|
-      fh.write(fcontents.sub(/2/, '3'))
-    end
-    pid = Process.spawn("install/program.exe")
-    result = run_rscons(op: "install")
-    expect(result.stderr).to eq ""
-    Process.wait(pid)
-  end
-
   context "clean operation" do
     it 'cleans built files' do
       test_dir("simple")
@@ -428,7 +440,7 @@ EOF
       %r{Linking program.exe},
     ])
     expect(File.exists?('inc.h')).to be_truthy
-    expect(`./program.exe`).to eq "The value is 5678\n"
+    expect(nr(`./program.exe`)).to eq "The value is 5678\n"
   end
 
   it 'supports custom builders with multiple targets' do
@@ -444,13 +456,13 @@ EOF
     ])
     expect(File.exists?("inc.c")).to be_truthy
     expect(File.exists?("inc.h")).to be_truthy
-    expect(`./program.exe`).to eq "The value is 42\n"
+    expect(nr(`./program.exe`)).to eq "The value is 42\n"
 
     File.open("inc.c", "w") {|fh| fh.puts "int THE_VALUE = 33;"}
     result = run_rscons(rsconscript: "multiple_targets.rb")
     expect(result.stderr).to eq ""
     verify_lines(lines(result.stdout), [%r{CHGen inc.c}])
-    expect(`./program.exe`).to eq "The value is 42\n"
+    expect(nr(`./program.exe`)).to eq "The value is 42\n"
   end
 
   it 'raises an error when a custom builder returns an invalid value from #run' do
@@ -518,7 +530,7 @@ EOF
     result = run_rscons
     expect(result.stderr).to eq ""
     expect(File.exists?('build/e.1/simple.cc.o')).to be_truthy
-    expect(`./simple.exe`).to eq "This is a simple C++ program\n"
+    expect(nr(`./simple.exe`)).to eq "This is a simple C++ program\n"
   end
 
   it "links with the C++ linker when object files were built from C++ sources" do
@@ -526,7 +538,7 @@ EOF
     result = run_rscons(rsconscript: "link_objects.rb")
     expect(result.stderr).to eq ""
     expect(File.exists?("simple.o")).to be_truthy
-    expect(`./simple.exe`).to eq "This is a simple C++ program\n"
+    expect(nr(`./simple.exe`)).to eq "This is a simple C++ program\n"
   end
 
   it 'allows overriding construction variables for individual builder calls' do
@@ -534,12 +546,12 @@ EOF
     result = run_rscons
     expect(result.stderr).to eq ""
     verify_lines(lines(result.stdout), [
-      %r{gcc -c -o one.o -MMD -MF one.o.mf -DONE one.c},
+      %r{gcc -c -o one.o -MMD -MF build/e.1/one.o.mf -DONE one.c},
       %r{gcc -c -o build/e.1/two.c.o -MMD -MF build/e.1/two.c.o.mf two.c},
       %r{gcc -o two_sources.exe one.o build/e.1/two.c.o},
     ])
     expect(File.exists?("two_sources.exe")).to be_truthy
-    expect(`./two_sources.exe`).to eq "This is a C program with two sources.\n"
+    expect(nr(`./two_sources.exe`)).to eq "This is a C program with two sources.\n"
   end
 
   it 'builds a static library archive' do
@@ -554,7 +566,7 @@ EOF
       %r{gcc -o library.exe lib.a build/e.1/three.c.o},
     ])
     expect(File.exists?("library.exe")).to be_truthy
-    expect(`ar t lib.a`).to eq "one.c.o\ntwo.c.o\n"
+    expect(nr(`ar t lib.a`)).to eq "one.c.o\ntwo.c.o\n"
   end
 
   it 'supports build hooks to override construction variables' do
@@ -566,7 +578,7 @@ EOF
       %r{gcc -c -o build/e.1/src/two/two.c.o -MMD -MF build/e.1/src/two/two.c.o.mf -Isrc/one -Isrc/two -O2 src/two/two.c},
       %r{gcc -o build_hook.exe build/e.1/src/one/one.c.o build/e.1/src/two/two.c.o},
     ])
-    expect(`./build_hook.exe`).to eq "Hello from two()\n"
+    expect(nr(`./build_hook.exe`)).to eq "Hello from two()\n"
   end
 
   it 'supports build hooks to override the entire vars hash' do
@@ -574,8 +586,8 @@ EOF
     result = run_rscons(rsconscript: "build_hooks_override_vars.rb")
     expect(result.stderr).to eq ""
     verify_lines(lines(result.stdout), [
-      %r{gcc -c -o one.o -MMD -MF one.o.mf -Isrc -Isrc/one -Isrc/two -O1 src/two/two.c},
-      %r{gcc -c -o two.o -MMD -MF two.o.mf -Isrc -Isrc/one -Isrc/two -O2 src/two/two.c},
+      %r{gcc -c -o one.o -MMD -MF build/e.1/one.o.mf -Isrc -Isrc/one -Isrc/two -O1 src/two/two.c},
+      %r{gcc -c -o two.o -MMD -MF build/e.1/two.o.mf -Isrc -Isrc/one -Isrc/two -O2 src/two/two.c},
     ])
     expect(File.exists?('one.o')).to be_truthy
     expect(File.exists?('two.o')).to be_truthy
@@ -592,7 +604,7 @@ EOF
       %r{Linking simple.exe},
     ])
     expect(File.exists?('build/e.1/simple.c.o')).to be_truthy
-    expect(`./simple.exe`).to eq "This is a simple C program\n"
+    expect(nr(`./simple.exe`)).to eq "This is a simple C program\n"
 
     File.open("program.ld", "w") {|fh| fh.puts("2")}
     result = run_rscons(rsconscript: "user_dependencies.rb")
@@ -609,15 +621,38 @@ EOF
     expect(result.stdout).to eq ""
   end
 
-  it "supports building D sources with gdc" do
-    test_dir("d")
-    result = run_rscons
+  it "rebuilds when user-specified dependencies using ^ change" do
+    test_dir("simple")
+
+    passenv["file_contents"] = "1"
+    result = run_rscons(rsconscript: "user_dependencies_carat.rb")
     expect(result.stderr).to eq ""
-    slines = lines(result.stdout)
-    verify_lines(slines, [%r{gdc -c -o build/e.1/main.d.o -MMD -MF build/e.1/main.d.o.mf main.d}])
-    verify_lines(slines, [%r{gdc -c -o build/e.1/mod.d.o -MMD -MF build/e.1/mod.d.o.mf mod.d}])
-    verify_lines(slines, [%r{gdc -o hello-d.exe build/e.1/main.d.o build/e.1/mod.d.o}])
-    expect(`./hello-d.exe`.rstrip).to eq "Hello from D, value is 42!"
+    verify_lines(lines(result.stdout), [
+      %r{Compiling simple.c},
+      %r{Linking .*simple.exe},
+    ])
+
+    passenv["file_contents"] = "2"
+    result = run_rscons(rsconscript: "user_dependencies_carat.rb")
+    expect(result.stderr).to eq ""
+    verify_lines(lines(result.stdout), [%r{Linking .*simple.exe}])
+
+    result = run_rscons(rsconscript: "user_dependencies_carat.rb")
+    expect(result.stderr).to eq ""
+    expect(result.stdout).to eq ""
+  end
+
+  unless RUBY_PLATFORM =~ /mingw|msys/
+    it "supports building D sources with gdc" do
+      test_dir("d")
+      result = run_rscons
+      expect(result.stderr).to eq ""
+      slines = lines(result.stdout)
+      verify_lines(slines, [%r{gdc -c -o build/e.1/main.d.o -MMD -MF build/e.1/main.d.o.mf main.d}])
+      verify_lines(slines, [%r{gdc -c -o build/e.1/mod.d.o -MMD -MF build/e.1/mod.d.o.mf mod.d}])
+      verify_lines(slines, [%r{gdc -o hello-d.exe build/e.1/main.d.o build/e.1/mod.d.o}])
+      expect(`./hello-d.exe`.rstrip).to eq "Hello from D, value is 42!"
+    end
   end
 
   it "supports building D sources with ldc2" do
@@ -625,8 +660,8 @@ EOF
     result = run_rscons(rsconscript: "build-ldc2.rb")
     expect(result.stderr).to eq ""
     slines = lines(result.stdout)
-    verify_lines(slines, [%r{ldc2 -c -of build/e.1/main.d.o(bj)? -deps=build/e.1/main.d.o.mf main.d}])
-    verify_lines(slines, [%r{ldc2 -c -of build/e.1/mod.d.o(bj)? -deps=build/e.1/mod.d.o.mf mod.d}])
+    verify_lines(slines, [%r{ldc2 -c -of build/e.1/main.d.o(bj)? -deps=build/e.1/main.d.o(bj)?.mf main.d}])
+    verify_lines(slines, [%r{ldc2 -c -of build/e.1/mod.d.o(bj)? -deps=build/e.1/mod.d.o(bj)?.mf mod.d}])
     verify_lines(slines, [%r{ldc2 -of hello-d.exe build/e.1/main.d.o(bj)? build/e.1/mod.d.o(bj)?}])
     expect(`./hello-d.exe`.rstrip).to eq "Hello from D, value is 42!"
   end
@@ -636,8 +671,8 @@ EOF
     result = run_rscons(rsconscript: "build-ldc2.rb")
     expect(result.stderr).to eq ""
     slines = lines(result.stdout)
-    verify_lines(slines, [%r{ldc2 -c -of build/e.1/main.d.o(bj)? -deps=build/e.1/main.d.o.mf main.d}])
-    verify_lines(slines, [%r{ldc2 -c -of build/e.1/mod.d.o(bj)? -deps=build/e.1/mod.d.o.mf mod.d}])
+    verify_lines(slines, [%r{ldc2 -c -of build/e.1/main.d.o(bj)? -deps=build/e.1/main.d.o(bj)?.mf main.d}])
+    verify_lines(slines, [%r{ldc2 -c -of build/e.1/mod.d.o(bj)? -deps=build/e.1/mod.d.o(bj)?.mf mod.d}])
     verify_lines(slines, [%r{ldc2 -of hello-d.exe build/e.1/main.d.o(bj)? build/e.1/mod.d.o(bj)?}])
     expect(`./hello-d.exe`.rstrip).to eq "Hello from D, value is 42!"
     contents = File.read("mod.d", mode: "rb").sub("42", "33")
@@ -647,13 +682,13 @@ EOF
     result = run_rscons(rsconscript: "build-ldc2.rb")
     expect(result.stderr).to eq ""
     slines = lines(result.stdout)
-    verify_lines(slines, [%r{ldc2 -c -of build/e.1/main.d.o(bj)? -deps=build/e.1/main.d.o.mf main.d}])
-    verify_lines(slines, [%r{ldc2 -c -of build/e.1/mod.d.o(bj)? -deps=build/e.1/mod.d.o.mf mod.d}])
+    verify_lines(slines, [%r{ldc2 -c -of build/e.1/main.d.o(bj)? -deps=build/e.1/main.d.o(bj)?.mf main.d}])
+    verify_lines(slines, [%r{ldc2 -c -of build/e.1/mod.d.o(bj)? -deps=build/e.1/mod.d.o(bj)?.mf mod.d}])
     verify_lines(slines, [%r{ldc2 -of hello-d.exe build/e.1/main.d.o(bj)? build/e.1/mod.d.o(bj)?}])
     expect(`./hello-d.exe`.rstrip).to eq "Hello from D, value is 33!"
   end
 
-  unless ENV["omit_gdc_tests"]
+  unless RUBY_PLATFORM =~ /mingw|msys/
     it "links with the D linker when object files were built from D sources" do
       test_dir("d")
       result = run_rscons(rsconscript: "link_objects.rb")
@@ -689,7 +724,7 @@ EOF
       result = run_rscons(rsconscript: "shared_library_d.rb")
       expect(result.stderr).to eq ""
       slines = lines(result.stdout)
-      if RUBY_PLATFORM =~ /mingw/
+      if RUBY_PLATFORM =~ /mingw|msys/
         verify_lines(slines, [%r{Linking mine.dll}])
       else
         verify_lines(slines, [%r{Linking libmine.so}])
@@ -715,7 +750,7 @@ EOF
     result = run_rscons(rsconscript: "preprocess.rb")
     expect(result.stderr).to eq ""
     expect(File.read("simplepp.c")).to match /# \d+ "simple.c"/
-    expect(`./simple.exe`).to eq "This is a simple C program\n"
+    expect(nr(`./simple.exe`)).to eq "This is a simple C program\n"
   end
 
   it "supports preprocessing C++ sources" do
@@ -723,7 +758,7 @@ EOF
     result = run_rscons(rsconscript: "preprocess.rb")
     expect(result.stderr).to eq ""
     expect(File.read("simplepp.cc")).to match /# \d+ "simple.cc"/
-    expect(`./simple.exe`).to eq "This is a simple C++ program\n"
+    expect(nr(`./simple.exe`)).to eq "This is a simple C++ program\n"
   end
 
   it "supports invoking builders with no sources" do
@@ -741,14 +776,14 @@ EOF
       %r{Linking program.exe},
     ])
     expect(File.exists?('inc.h')).to be_truthy
-    expect(`./program.exe`).to eq "The value is 678\n"
+    expect(nr(`./program.exe`)).to eq "The value is 678\n"
   end
 
   it "supports lambdas as construction variable values" do
     test_dir "custom_builder"
     result = run_rscons(rsconscript: "cvar_lambda.rb")
     expect(result.stderr).to eq ""
-    expect(`./program.exe`).to eq "The value is 5678\n"
+    expect(nr(`./program.exe`)).to eq "The value is 5678\n"
   end
 
   it "supports registering build targets from within a build hook" do
@@ -757,7 +792,7 @@ EOF
     expect(result.stderr).to eq ""
     expect(File.exists?("build/e.1/simple.c.o")).to be_truthy
     expect(File.exists?("build/e.1/simple.c.o.txt")).to be_truthy
-    expect(`./simple.exe`).to eq "This is a simple C program\n"
+    expect(nr(`./simple.exe`)).to eq "This is a simple C program\n"
   end
 
   it "supports multiple values for CXXSUFFIX" do
@@ -767,7 +802,7 @@ EOF
     expect(result.stderr).to eq ""
     expect(File.exists?("build/e.1/simple.cc.o")).to be_truthy
     expect(File.exists?("build/e.1/other.cccc.o")).to be_truthy
-    expect(`./simple.exe`).to eq "This is a simple C++ program\n"
+    expect(nr(`./simple.exe`)).to eq "This is a simple C++ program\n"
   end
 
   it "supports multiple values for CSUFFIX" do
@@ -777,7 +812,7 @@ EOF
     expect(result.stderr).to eq ""
     expect(File.exists?("build/e.1/src/one/one.yargh.o")).to be_truthy
     expect(File.exists?("build/e.1/src/two/two.c.o")).to be_truthy
-    expect(`./program.exe`).to eq "Hello from two()\n"
+    expect(nr(`./program.exe`)).to eq "Hello from two()\n"
   end
 
   it "supports multiple values for OBJSUFFIX" do
@@ -787,7 +822,7 @@ EOF
     expect(File.exists?("two_sources.exe")).to be_truthy
     expect(File.exists?("one.oooo")).to be_truthy
     expect(File.exists?("two.ooo")).to be_truthy
-    expect(`./two_sources.exe`).to eq "This is a C program with two sources.\n"
+    expect(nr(`./two_sources.exe`)).to eq "This is a C program with two sources.\n"
   end
 
   it "supports multiple values for LIBSUFFIX" do
@@ -795,7 +830,7 @@ EOF
     result = run_rscons(rsconscript: "libsuffix.rb")
     expect(result.stderr).to eq ""
     expect(File.exists?("two_sources.exe")).to be_truthy
-    expect(`./two_sources.exe`).to eq "This is a C program with two sources.\n"
+    expect(nr(`./two_sources.exe`)).to eq "This is a C program with two sources.\n"
   end
 
   it "supports multiple values for ASSUFFIX" do
@@ -810,7 +845,7 @@ EOF
       %r{Linking two_sources.exe},
     ])
     expect(File.exists?("two_sources.exe")).to be_truthy
-    expect(`./two_sources.exe`).to eq "This is a C program with two sources.\n"
+    expect(nr(`./two_sources.exe`)).to eq "This is a C program with two sources.\n"
   end
 
   it "supports dumping an Environment's construction variables" do
@@ -849,7 +884,7 @@ EOF
     result = run_rscons(rsconscript: "cvar_array.rb")
     expect(result.stderr).to eq ""
     expect(File.exists?("build/e.1/simple.c.o")).to be_truthy
-    expect(`./simple.exe`).to eq "This is a simple C program\n"
+    expect(nr(`./simple.exe`)).to eq "This is a simple C program\n"
   end
 
   it "supports registering multiple build targets with the same target path" do
@@ -940,7 +975,7 @@ EOF
     result = run_rscons
     expect(result.stderr).to eq ""
     slines = lines(result.stdout)
-    if RUBY_PLATFORM =~ /mingw/
+    if RUBY_PLATFORM =~ /mingw|msys/
       verify_lines(slines, [%r{Linking mine.dll}])
       expect(File.exists?("mine.dll")).to be_truthy
     else
@@ -952,7 +987,7 @@ EOF
     expect(result.stderr).to eq ""
     expect(result.stdout).to eq ""
 
-    ld_library_path_prefix = (RUBY_PLATFORM =~ /mingw/ ? "" : "LD_LIBRARY_PATH=. ")
+    ld_library_path_prefix = (RUBY_PLATFORM =~ /mingw|msys/ ? "" : "LD_LIBRARY_PATH=. ")
     expect(`#{ld_library_path_prefix}./test-shared.exe`).to match /Hi from one/
     expect(`./test-static.exe`).to match /Hi from one/
   end
@@ -971,7 +1006,7 @@ EOF
     result = run_rscons(rsconscript: "shared_library_cxx.rb")
     expect(result.stderr).to eq ""
     slines = lines(result.stdout)
-    if RUBY_PLATFORM =~ /mingw/
+    if RUBY_PLATFORM =~ /mingw|msys/
       verify_lines(slines, [%r{Linking mine.dll}])
     else
       verify_lines(slines, [%r{Linking libmine.so}])
@@ -981,7 +1016,7 @@ EOF
     expect(result.stderr).to eq ""
     expect(result.stdout).to eq ""
 
-    ld_library_path_prefix = (RUBY_PLATFORM =~ /mingw/ ? "" : "LD_LIBRARY_PATH=. ")
+    ld_library_path_prefix = (RUBY_PLATFORM =~ /mingw|msys/ ? "" : "LD_LIBRARY_PATH=. ")
     expect(`#{ld_library_path_prefix}./test-shared.exe`).to match /Hi from one/
     expect(`./test-static.exe`).to match /Hi from one/
   end
@@ -1048,7 +1083,7 @@ EOF
 
     result = run_rscons
     expect(result.stderr).to match /Failed to build/
-    expect(result.stderr).to match /^Use.*-F.*to view the failed command log/
+    expect(result.stderr).to match %r{^Use .*/rscons(\.rb)? -F.*to view the failed command log}
     expect(result.status).to_not eq 0
 
     result = run_rscons(rscons_args: %w[-F])
@@ -1058,6 +1093,23 @@ EOF
     expect(result.status).to eq 0
   end
 
+  it "stores build artifacts in a directory according to Environment name" do
+    test_dir "typical"
+
+    result = run_rscons
+    expect(File.exist?("build/typical/typical.exe")).to be_truthy
+    expect(File.exist?("build/typical/src/one/one.c.o")).to be_truthy
+  end
+
+  it "names Environment during clone" do
+    test_dir "typical"
+
+    result = run_rscons(rsconscript: "clone_and_name.rb")
+    expect(File.exist?("build/typical/typical.exe")).to be_truthy
+    expect(File.exist?("build/typical/src/one/one.c.o")).to be_truthy
+    expect(Dir.exist?("build/e.1")).to be_falsey
+  end
+
   context "colored output" do
     it "does not output in color with --color=off" do
       test_dir("simple")
@@ -1112,7 +1164,7 @@ EOF
       result = run_rscons(rsconscript: "command_builder.rb")
       expect(result.stderr).to eq ""
       verify_lines(lines(result.stdout), [%r{BuildIt simple.exe}])
-      expect(`./simple.exe`).to eq "This is a simple C program\n"
+      expect(nr(`./simple.exe`)).to eq "This is a simple C program\n"
 
       result = run_rscons(rsconscript: "command_builder.rb")
       expect(result.stderr).to eq ""
@@ -1278,7 +1330,8 @@ EOF
   context "Cache management" do
     it "prints a warning when the cache is corrupt" do
       test_dir("simple")
-      File.open(Rscons::Cache::CACHE_FILE, "w") do |fh|
+      FileUtils.mkdir("build")
+      File.open("build/.rsconscache", "w") do |fh|
         fh.puts("[1]")
       end
       result = run_rscons
@@ -1457,6 +1510,25 @@ EOF
       expect(result.status).to eq 0
     end
 
+    it "allows prepending and appending to PATH" do
+      test_dir "simple"
+      result = run_rscons(rsconscript: "pathing.rb")
+      expect(result.stderr).to eq ""
+      expect(result.stdout).to match /flex!/
+      expect(result.stdout).to match /foobar!/
+      expect(File.exist?("simple.o")).to be_truthy
+    end
+
+    it "writes the dependency file to the build root" do
+      test_dir "simple"
+      result = run_rscons(rsconscript: "distclean.rb")
+      expect(result.stderr).to eq ""
+      expect(result.stdout).to match /Compiling simple\.c/
+      expect(File.exist?("simple.o")).to be_truthy
+      expect(File.exist?("simple.o.mf")).to be_falsey
+      expect(File.exist?("build/e.1/simple.o.mf")).to be_truthy
+    end
+
     context "debugging" do
       it "prints a message when the target does not exist" do
         test_dir("simple")
@@ -1550,7 +1622,7 @@ EOF
       result = run_rscons(rsconscript: "override_depfilesuffix.rb")
       expect(result.stderr).to eq ""
       verify_lines(lines(result.stdout), [
-        %r{gcc -c -o simple.o -MMD -MF simple.o.deppy simple.c},
+        %r{gcc -c -o simple.o -MMD -MF build/e.1/simple.o.deppy simple.c},
       ])
     end
 
@@ -1593,7 +1665,7 @@ EOF
       result = run_rscons(rsconscript: "shared_library_set_shld.rb")
       expect(result.stderr).to eq ""
       slines = lines(result.stdout)
-      if RUBY_PLATFORM =~ /mingw/
+      if RUBY_PLATFORM =~ /mingw|msys/
         verify_lines(slines, [%r{Linking mine.dll}])
       else
         verify_lines(slines, [%r{Linking libmine.so}])
@@ -1608,6 +1680,21 @@ EOF
     end
   end
 
+  context "Size builder" do
+    it "generates a size file" do
+      test_dir "simple"
+
+      result = run_rscons(rsconscript: "size.rb")
+      verify_lines(lines(result.stdout), [
+        /Linking .*simple\.exe/,
+        /Size .*simple\.exe .*simple\.size/,
+      ])
+      expect(File.exist?("simple.exe")).to be_truthy
+      expect(File.exist?("simple.size")).to be_truthy
+      expect(File.read("simple.size")).to match /text.*data.*bss/
+    end
+  end
+
   context "multi-threading" do
     it "waits for subcommands in threads for builders that support threaded commands" do
       test_dir("simple")
@@ -1711,6 +1798,22 @@ EOF
       expect(result.status).to_not eq 0
     end
 
+    it "automatically runs the configure operation if the project is not yet configured in the given build directory" do
+      test_dir "configure"
+
+      result = run_rscons(rsconscript: "check_c_compiler.rb")
+      expect(result.stderr).to eq ""
+      expect(result.status).to eq 0
+      expect(result.stdout).to match /Checking for C compiler\.\.\./
+      expect(Dir.exist?("build/_configure")).to be_truthy
+
+      result = run_rscons(rsconscript: "check_c_compiler.rb", rscons_args: %w[--build=bb])
+      expect(result.stderr).to eq ""
+      expect(result.status).to eq 0
+      expect(result.stdout).to match /Checking for C compiler\.\.\./
+      expect(Dir.exist?("bb/_configure")).to be_truthy
+    end
+
     context "check_c_compiler" do
       {"check_c_compiler.rb" => "when no arguments are given",
        "check_c_compiler_find_first.rb" => "when arguments are given"}.each_pair do |rsconscript, desc|
@@ -1801,12 +1904,14 @@ EOF
       {"check_d_compiler.rb" => "when no arguments are given",
        "check_d_compiler_find_first.rb" => "when arguments are given"}.each_pair do |rsconscript, desc|
         context desc do
-          it "finds the first listed D compiler" do
-            test_dir "configure"
-            result = run_rscons(rsconscript: rsconscript, op: "configure")
-            expect(result.stderr).to eq ""
-            expect(result.status).to eq 0
-            expect(result.stdout).to match /Checking for D compiler\.\.\. gdc/
+          unless RUBY_PLATFORM =~ /mingw|msys/
+            it "finds the first listed D compiler" do
+              test_dir "configure"
+              result = run_rscons(rsconscript: rsconscript, op: "configure")
+              expect(result.stderr).to eq ""
+              expect(result.status).to eq 0
+              expect(result.stdout).to match /Checking for D compiler\.\.\. gdc/
+            end
           end
 
           it "finds the second listed D compiler" do
@@ -1830,13 +1935,15 @@ EOF
         end
       end
 
-      it "successfully tests a compiler with an unknown name that uses gdc-compatible options" do
-        test_dir "configure"
-        create_exe "mycompiler", %[exec gdc "$@"]
-        result = run_rscons(rsconscript: "check_d_compiler_custom.rb", op: "configure")
-        expect(result.stderr).to eq ""
-        expect(result.status).to eq 0
-        expect(result.stdout).to match /Checking for D compiler\.\.\. mycompiler/
+      unless RUBY_PLATFORM =~ /mingw|msys/
+        it "successfully tests a compiler with an unknown name that uses gdc-compatible options" do
+          test_dir "configure"
+          create_exe "mycompiler", %[exec gdc "$@"]
+          result = run_rscons(rsconscript: "check_d_compiler_custom.rb", op: "configure")
+          expect(result.stderr).to eq ""
+          expect(result.status).to eq 0
+          expect(result.stdout).to match /Checking for D compiler\.\.\. mycompiler/
+        end
       end
 
       it "successfully tests a compiler with an unknown name that uses ldc2-compatible options" do
@@ -2226,6 +2333,16 @@ EOF
       end
     end
 
+    context "on_fail option" do
+      it "prints on_fail messages and calls on_fail procs on failure" do
+        test_dir "configure"
+        result = run_rscons(rsconscript: "on_fail.rb", op: %w[configure])
+        expect(result.status).to_not eq 0
+        expect(result.stdout).to match /Install the foo123 package/
+        expect(result.stdout).to match /Install the foo123cxx package/
+      end
+    end
+
     it "does everything" do
       test_dir "configure"
       create_exe "pkg-config", "echo '-DMYPACKAGE'"
@@ -2233,7 +2350,6 @@ EOF
       expect(result.stderr).to eq ""
       expect(result.status).to eq 0
       expect(result.stdout).to match /Configuring configure test\.\.\./
-      expect(result.stdout).to match /Setting build directory\.\.\. bb/
       expect(result.stdout).to match %r{Setting prefix\.\.\. /my/prefix}
       expect(result.stdout).to match /Checking for C compiler\.\.\. gcc/
       expect(result.stdout).to match /Checking for C\+\+ compiler\.\.\. g\+\+/
@@ -2244,6 +2360,8 @@ EOF
       expect(result.stdout).to match /Checking for D import 'std.stdio'\.\.\. found/
       expect(result.stdout).to match /Checking for library 'm'\.\.\. found/
       expect(result.stdout).to match /Checking for program 'ls'\.\.\. .*ls/
+      expect(Dir.exist?("build")).to be_falsey
+      expect(Dir.exist?("bb/_configure")).to be_truthy
     end
 
     it "aggregates multiple set_define's" do
@@ -2306,7 +2424,6 @@ EOF
       expect(result.status).to eq 0
       expect(File.exists?("simple.o")).to be_falsey
       expect(File.exists?("build")).to be_falsey
-      expect(File.exists?(Rscons::Cache::CACHE_FILE)).to be_falsey
     end
   end
 
@@ -2379,7 +2496,7 @@ EOF
       expect(result.stderr).to eq ""
       expect(result.stdout).to match %r{Compiling/Linking}
       expect(File.exists?("test.exe")).to be_truthy
-      ld_library_path_prefix = (RUBY_PLATFORM =~ /mingw/ ? "" : "LD_LIBRARY_PATH=. ")
+      ld_library_path_prefix = (RUBY_PLATFORM =~ /mingw|msys/ ? "" : "LD_LIBRARY_PATH=. ")
       expect(`#{ld_library_path_prefix}./test.exe`).to match /three/
 
       result = run_rscons(rsconscript: "c_shared_library.rb")
@@ -2574,4 +2691,188 @@ EOF
     end
   end
 
+  context "with subsidiary scripts" do
+    context "with a script specified" do
+      it "executes the subsidiary script from configure block" do
+        test_dir "subsidiary"
+
+        result = run_rscons(op: %W[configure])
+        expect(result.stderr).to eq ""
+        verify_lines(lines(result.stdout), [
+          %r{Entering directory '.*/sub'},
+          %r{sub Rsconscript configure},
+          %r{Leaving directory '.*/sub'},
+          %r{Entering directory '.*/sub'},
+          %r{sub Rsconscript build},
+          %r{Leaving directory '.*/sub'},
+          %r{Entering directory '.*/sub'},
+          %r{sub Rsconscript2 configure},
+          %r{Leaving directory '.*/sub'},
+          %r{top configure},
+        ])
+      end
+
+      it "executes the subsidiary script from build block" do
+        test_dir "subsidiary"
+
+        result = run_rscons(op: %W[configure])
+        expect(result.stderr).to eq ""
+        result = run_rscons(op: %W[build])
+        expect(result.stderr).to eq ""
+        verify_lines(lines(result.stdout), [
+          %r{sub Rsconscript2 build},
+          %r{top build},
+        ])
+      end
+    end
+
+    context "with a directory specified" do
+      it "executes the subsidiary script from configure block" do
+        test_dir "subsidiary"
+
+        result = run_rscons(rsconscript: "Rsconscript_dir", op: %W[configure])
+        expect(result.stderr).to eq ""
+        verify_lines(lines(result.stdout), [
+          %r{Entering directory '.*/sub'},
+          %r{sub Rsconscript configure},
+          %r{Leaving directory '.*/sub'},
+          %r{Entering directory '.*/sub'},
+          %r{sub Rsconscript build},
+          %r{Leaving directory '.*/sub'},
+          %r{Entering directory '.*/sub'},
+          %r{sub Rsconscript2 configure},
+          %r{Leaving directory '.*/sub'},
+          %r{top configure},
+        ])
+      end
+
+      it "executes the subsidiary script from build block" do
+        test_dir "subsidiary"
+
+        result = run_rscons(rsconscript: "Rsconscript_dir", op: %W[configure])
+        expect(result.stderr).to eq ""
+        result = run_rscons(rsconscript: "Rsconscript_dir", op: %W[build])
+        expect(result.stderr).to eq ""
+        verify_lines(lines(result.stdout), [
+          %r{sub Rsconscript2 build},
+          %r{top build},
+        ])
+      end
+    end
+
+    context "with a rscons binary in the subsidiary script directory" do
+      it "executes rscons from the subsidiary script directory" do
+        test_dir "subsidiary"
+
+        File.binwrite("sub/rscons", <<EOF)
+#!/usr/bin/env ruby
+puts "sub rscons"
+EOF
+        FileUtils.chmod(0755, "sub/rscons")
+        result = run_rscons(op: %W[configure])
+        expect(result.stderr).to eq ""
+        verify_lines(lines(result.stdout), [
+          %r{Entering directory '.*/sub'},
+          %r{sub rscons},
+          %r{Leaving directory '.*/sub'},
+          %r{Entering directory '.*/sub'},
+          %r{sub rscons},
+          %r{Leaving directory '.*/sub'},
+          %r{Entering directory '.*/sub'},
+          %r{sub rscons},
+          %r{Leaving directory '.*/sub'},
+          %r{top configure},
+        ])
+      end
+    end
+
+    it "does not print entering/leaving directory messages when the subsidiary script is in the same directory" do
+      test_dir "subsidiary"
+
+      result = run_rscons(rsconscript: "Rsconscript_samedir", op: %W[configure])
+      expect(result.stderr).to eq ""
+      result = run_rscons(rsconscript: "Rsconscript_samedir", op: %W[build])
+      expect(result.stderr).to eq ""
+      expect(result.stdout).to_not match(%{(Entering|Leaving) directory})
+      verify_lines(lines(result.stdout), [
+        %r{second build},
+        %r{top build},
+      ])
+    end
+
+    it "terminates execution when a subsidiary script fails" do
+      test_dir "subsidiary"
+
+      result = run_rscons(rsconscript: "Rsconscript_fail", op: %W[configure])
+      expect(result.stderr).to_not eq ""
+      expect(result.status).to_not eq 0
+      expect(result.stdout).to_not match /top configure/
+    end
+
+    it "does not pass RSCONS_BUILD_DIR to subsidiary scripts" do
+      test_dir "subsidiary"
+      passenv["RSCONS_BUILD_DIR"] = "buildit"
+      result = run_rscons(op: %W[configure])
+      expect(result.stderr).to eq ""
+      expect(Dir.exist?("build")).to be_falsey
+      expect(Dir.exist?("buildit")).to be_truthy
+      expect(Dir.exist?("sub/build")).to be_truthy
+      expect(Dir.exist?("sub/buildit")).to be_falsey
+    end
+  end
+
+  context "sh method" do
+    it "executes the command given" do
+      test_dir "sh"
+      result = run_rscons(rsconscript: "sh.rb")
+      expect(result.stderr).to eq ""
+      expect(result.status).to eq 0
+      verify_lines(lines(result.stdout), [
+        "hi  there",
+        "1 2",
+      ])
+    end
+
+    it "prints the command when executing verbosely" do
+      test_dir "sh"
+      result = run_rscons(rsconscript: "sh.rb", rscons_args: %w[-v])
+      expect(result.stderr).to eq ""
+      expect(result.status).to eq 0
+      verify_lines(lines(result.stdout), [
+        %r{echo 'hi  there'},
+        "hi  there",
+        %r{echo  1  2},
+        "1 2",
+      ])
+    end
+
+    it "terminates execution on failure" do
+      test_dir "sh"
+      result = run_rscons(rsconscript: "sh_fail.rb")
+      expect(result.stderr).to match /sh_fail\.rb:2:.*foobar42/
+      expect(result.status).to_not eq 0
+      expect(result.stdout).to_not match /continued/
+    end
+
+    it "continues execution on failure when :continue option is set" do
+      test_dir "sh"
+      result = run_rscons(rsconscript: "sh_fail_continue.rb")
+      expect(result.stderr).to match /sh_fail_continue\.rb:2:.*foobar42/
+      expect(result.status).to eq 0
+      expect(result.stdout).to match /continued/
+    end
+  end
+
+  context "FileUtils methods" do
+    it "defines FileUtils methods to be available in the build script" do
+      test_dir "typical"
+      result = run_rscons(rsconscript: "fileutils_methods.rb")
+      expect(result.stderr).to eq ""
+      expect(result.status).to eq 0
+      expect(Dir.exist?("foobar")).to be_truthy
+      expect(Dir.exist?("foo")).to be_falsey
+      expect(File.exist?("foobar/baz/b.txt")).to be_truthy
+    end
+  end
+
 end

spec/rscons/util_spec.rb

@@ -68,7 +68,7 @@ EOF
             expect(RbConfig::CONFIG).to receive(:[]).with("host_os").and_return("mingw")
           end
           it "returns the number of logical processors that wmic reports" do
-            expect(Util).to receive(:`).with("wmic cpu get NumberOfLogicalProcessors /value").and_return("NumberOfLogicalProcessors=7")
+            expect(Util).to receive(:`).with("wmic cpu get NumberOfLogicalProcessors -value").and_return("NumberOfLogicalProcessors=7")
             expect(Util.determine_n_threads).to eq(7)
           end
         end

spec/spec_helper.rb

@@ -1,25 +1,25 @@
-require "simplecov"
-
-SimpleCov.start do
-  add_filter "/spec/"
-  add_filter "/.bundle/"
-  if ENV["partial_specs"]
-    command_name "RSpec-partial"
-  else
-    command_name "RSpec"
-  end
-  if ENV["dist_specs"]
-    add_filter "/bin/"
-    add_filter "/lib/"
-  else
-    add_filter "test/rscons.rb"
-  end
-  project_name "Rscons"
-  merge_timeout 3600
-end
-
 if ENV["dist_specs"]
   require_relative "../test/rscons"
 else
+  require "simplecov"
+
+  SimpleCov.start do
+    add_filter "/spec/"
+    add_filter "/.bundle/"
+    if ENV["partial_specs"]
+      command_name "RSpec-partial"
+    else
+      command_name "RSpec"
+    end
+    if ENV["dist_specs"]
+      add_filter "/bin/"
+      add_filter "/lib/"
+    else
+      add_filter "test/rscons.rb"
+    end
+    project_name "Rscons"
+    merge_timeout 3600
+  end
+
   require "rscons"
 end