wip for precompile phase for D

.gitignore

@@ -7,5 +7,5 @@
 /gen/
 /large_project/
 /pkg/
-/test_run/
+/test/
 /yard/

Gemfile

@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 gem "base64"
 gem "rspec"
 gem "rake"
-gem "simplecov"
+gem "simplecov", "~> 0.15.0"
 gem "openssl"
 if RbConfig::CONFIG["host"]["msys"]
   gem "json", "2.1.0"

Gemfile.lock

@@ -4,7 +4,7 @@ GEM
     base64 (0.3.0)
     date (3.5.1)
     diff-lcs (1.6.2)
-    docile (1.4.1)
+    docile (1.1.5)
     erb (6.0.1)
     json (2.18.0)
     openssl (4.0.0)
@@ -30,12 +30,11 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.6)
-    simplecov (0.22.0)
-      docile (~> 1.1)
-      simplecov-html (~> 0.11)
-      simplecov_json_formatter (~> 0.1)
-    simplecov-html (0.13.2)
-    simplecov_json_formatter (0.1.4)
+    simplecov (0.15.1)
+      docile (~> 1.1.0)
+      json (>= 1.8, < 3)
+      simplecov-html (~> 0.10.0)
+    simplecov-html (0.10.2)
     stringio (3.2.0)
     syntax (1.2.2)
     tsort (0.2.0)
@@ -53,7 +52,7 @@ DEPENDENCIES
   rdoc
   redcarpet
   rspec
-  simplecov
+  simplecov (~> 0.15.0)
   syntax
   yard
 

Rakefile.rb

@@ -8,10 +8,8 @@ end
 require "rspec/core/rake_task"
 require "rake/clean"
 require "fileutils"
-require "simplecov"
-require "stringio"
 
-CLEAN.include %w[build_test_run .yardoc yard coverage test_run]
+CLEAN.include %w[build_test_run .yardoc yard coverage test]
 CLOBBER.include %w[dist gen large_project pkg]
 
 task :build_dist do
@@ -21,42 +19,24 @@ 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
-task :spec => :build_tests
-task :spec do
-  unless ENV["rscons_dist_specs"]
-    original_stdout = $stdout
-    sio = StringIO.new
-    $stdout = sio
-    SimpleCov.collate Dir["coverage/.resultset.json", "coverage/bt*/.resultset.json"]
-    $stdout = original_stdout
-    sio.string.lines.each do |line|
-      $stdout.write(line) unless line =~ /Coverage report generated for/
-    end
-  end
-end
-
-task :build_tests do |task, args|
-  ENV["specs"] = "1"
-  sh "ruby -Ilib build_tests/build_tests.rb"
-  ENV.delete("specs")
-end
 
 # dspec task is useful to test the distributable release script, but is not
 # useful for coverage information.
 desc "Dist Specs"
 task :dspec, [:example_string] => :build_dist do |task, args|
-  FileUtils.rm_rf("test_run")
-  FileUtils.mkdir_p("test_run")
-  FileUtils.cp("dist/rscons", "test_run/rscons.rb")
+  FileUtils.rm_rf("test")
+  FileUtils.mkdir_p("test")
+  FileUtils.cp("dist/rscons", "test/rscons.rb")
   ENV["rscons_dist_specs"] = "1"
   Rake::Task["spec"].execute(args)
-  Rake::Task["build_tests"].execute(args)
   ENV.delete("rscons_dist_specs")
   FileUtils.rm_f(Dir.glob(".rscons-*"))
 end

build_tests/d/Rsconscript

@@ -3,5 +3,6 @@ configure do
 end
 
 env(echo: :command) do |env|
-  env.Program("hello-d.exe", glob("*.d"))
+  env["D_IMPORT_PATH"] << "src"
+  env.Program("hello-d.exe", glob("src/*.d"))
 end

build_tests/d/build-ldc2.rb

@@ -3,5 +3,6 @@ configure do
 end
 
 env(echo: :command) do |env|
-  env.Program("hello-d.exe", glob("*.d"))
+  env["D_IMPORT_PATH"] << "src"
+  env.Program("hello-d.exe", glob("src/*.d"))
 end

build_tests/d/link_objects.rb

@@ -1,5 +1,6 @@
 env(echo: :command) do |env|
-  env.Object("main.o", "main.d")
-  env.Object("mod.o", "mod.d")
+  env["LD_LIBRARY_PATH"] << "src"
+  env.Object("main.o", "src/main.d")
+  env.Object("mod.o", "src/mod.d")
   env.Program("hello-d.exe", ["main.o", "mod.o"])
 end

build_tests/simple/abs_rel_paths.rb

@@ -1,14 +0,0 @@
-class B < Builder
-  def run(*args)
-    puts @target
-    true
-  end
-end
-
-env do |env|
-  env.add_builder(B)
-  env.B("one", File.expand_path("two"))
-  env.B("two")
-  env.B("three")
-  env.depends("two", File.expand_path("three"))
-end

build_tests/simple/barrier_builder.rb

@@ -1,15 +0,0 @@
-class B < Builder
-  def run(*args)
-    puts "B:#{@target}"
-    true
-  end
-end
-
-env do |env|
-  env.add_builder(B)
-  env.B("one")
-  env.B("two")
-  env.B("three")
-  env.Barrier(:bar, %w[two three])
-  env.depends("one", :bar)
-end

build_tests/typical/build_hooks_override_vars.rb

@@ -3,6 +3,7 @@ env(echo: :command) do |env|
   env.add_build_hook do |builder|
     if builder.name == "Object" && builder.sources.first =~ %r{one\.c}
       builder.vars["CFLAGS"] << "-O1"
+      builder.sources = ['src/two/two.c']
     elsif builder.name == "Object" && builder.target =~ %r{two\.o}
       new_vars = builder.vars.clone
       new_vars["CFLAGS"] << "-O2"

lib/rscons.rb

@@ -33,6 +33,7 @@ module Rscons
     :Lex,
     :Library,
     :Object,
+    :Precompile,
     :Preprocess,
     :Program,
     :SharedLibrary,
@@ -152,6 +153,7 @@ require_relative "rscons/builders/disassemble"
 require_relative "rscons/builders/lex"
 require_relative "rscons/builders/library"
 require_relative "rscons/builders/object"
+require_relative "rscons/builders/precompile"
 require_relative "rscons/builders/preprocess"
 require_relative "rscons/builders/program"
 require_relative "rscons/builders/shared_library"

lib/rscons/builder.rb

@@ -29,27 +29,19 @@ module Rscons
 
     # @return [String, Symbol]
     #   Target file name.
-    attr_reader :target
+    attr_accessor :target
 
-    # @return [String, Symbol]
-    #   Absolute target file name.
-    attr_reader :abstarget
-
-    # @return [Array<String, Symbol>]
-    #   Source file names.
-    attr_reader :sources
-
-    # @return [Array<String, Symbol>]
-    #   Absolute source file names.
-    attr_reader :abssources
+    # @return [Array<String>]
+    #   Source file name(s).
+    attr_accessor :sources
 
     # @return [Cache]
     #   Cache instance.
-    attr_reader :cache
+    attr_accessor :cache
 
     # @return [Environment]
     #   The {Environment} performing the build operation.
-    attr_reader :env
+    attr_accessor :env
 
     # @return [Hash, VarSet]
     #   Construction variables used to perform the build operation.
@@ -57,7 +49,7 @@ module Rscons
 
     # @return [Set<String>]
     #   Side effect file(s) produced when this builder runs.
-    attr_reader :side_effects
+    attr_accessor :side_effects
 
     # @return [Integer]
     #   Build step.
@@ -79,11 +71,7 @@ module Rscons
     #   Extra construction variables.
     def initialize(options)
       @target = options[:target]
-      @abstarget = Util.absolute_path(@target)
-      @sources = Array(options[:sources])
-      @abssources = @sources.map do |source|
-        Util.absolute_path(source)
-      end
+      @sources = options[:sources]
       @cache = options[:cache]
       @env = options[:env]
       @vars = options[:vars]
@@ -115,7 +103,7 @@ module Rscons
     # @return [void]
     def produces(*side_effects)
       side_effects.each do |side_effect|
-        side_effect_expanded = Util.absolute_path(@env.expand(side_effect))
+        side_effect_expanded = @env.expand(side_effect)
         @env.register_side_effect(side_effect_expanded)
         @side_effects << side_effect_expanded
       end

lib/rscons/builder_set.rb

@@ -27,8 +27,9 @@ module Rscons
       #   env.Directory("dest")
       #   env.Install("dest", "bin")
       #   env.Install("dest", "share")
-      self[builder.abstarget] ||= []
-      self[builder.abstarget] << builder
+      target = Util.absolute_path(builder.target)
+      self[target] ||= []
+      self[target] << builder
     end
 
     # Return the number of remaining build steps.
@@ -54,10 +55,15 @@ module Rscons
     #   The next builder to run.
     def get_next_builder_to_run(targets_still_building)
       to_build = self.find do |target, builders|
-        deps = builders.first.abssources + (@build_dependencies[target] || []).to_a
+        deps = builders.first.sources + (@build_dependencies[target] || []).to_a
+        deps.map! {|dep| Util.absolute_path(dep)}
         # All dependencies must have been built for this target to be ready to
         # build.
         deps.all? do |dep|
+          puts "BuilderSet: #{target}: dep #{dep}"
+          puts "  still building? #{targets_still_building.include?(dep)}"
+          puts "  self.include? #{self.include?(dep)}"
+          puts "  @side_effects.include? #{@side_effects.include?(dep)}"
           !(targets_still_building.include?(dep) ||
             self.include?(dep) ||
             @side_effects.include?(dep))
@@ -66,6 +72,7 @@ module Rscons
 
       if to_build
         target, builders = *to_build
+        puts "Selecting #{target.inspect} to build"
         builder = builders.first
         if builders.size > 1
           builders.slice!(0)
@@ -79,7 +86,7 @@ module Rscons
       # not find a builder to run above, then there might be a circular
       # dependency introduced by the user.
       if (self.size > 0) and targets_still_building.empty?
-        raise "Could not find a runnable builder. Possible circular dependency for #{self.first[1].first.target}"
+        raise "Could not find a runnable builder. Possible circular dependency for #{self.keys.first}"
       end
     end
 

lib/rscons/builders/mixins/object_deps.rb

@@ -15,11 +15,16 @@ module Rscons
         #   List of paths to the object or static library dependencies.
         def register_object_deps(builder_class)
           suffixes = @env.expand_varref(["${OBJSUFFIX}", "${LIBSUFFIX}"], @vars)
+          barrier_target = @env.setup_precompile(@sources)
           @sources.map do |source|
             if source.end_with?(*suffixes)
               source
             else
-              @env.register_dependency_build(@target, source, suffixes.first, @vars, builder_class)
+              object_file_path = @env.register_dependency_build(@target, source, suffixes.first, @vars, builder_class)
+              if barrier_target
+                @env.depends(object_file_path, barrier_target)
+              end
+              object_file_path
             end
           end
         end

lib/rscons/builders/precompile.rb

@@ -0,0 +1,29 @@
+module Rscons
+  module Builders
+    # The Precompile builder generates .di interface files from .d source files
+    # for D.
+    class Precompile < Builder
+
+      # Run the builder to produce a build target.
+      def run(options)
+        if @command
+          finalize_command
+        else
+          if @sources.find {|s| s.end_with?(*@env.expand_varref("${DSUFFIX}", @vars))}
+            pcc = @env.expand_varref("${DC}")
+            if pcc =~ /ldc/
+              dpc_cmd = "${DPC_CMD:ldc}"
+            else
+              dpc_cmd = "${DPC_CMD:gdc}"
+            end
+            @vars["_TARGET"] = @target
+            @vars["_SOURCES"] = @sources
+            command = @env.build_command(dpc_cmd, @vars)
+            standard_command("Precompile <source>#{Util.short_format_paths(@sources)}<reset>", command)
+          end
+        end
+      end
+
+    end
+  end
+end

lib/rscons/cache.rb

@@ -142,16 +142,16 @@ module Rscons
     #   - each cached dependency file's current checksum matches the checksum
     #     stored in the cache file
     def up_to_date?(targets, command, deps, env, options = {})
-      deps = deps.map {|dep| Util.absolute_path(dep)}
+      deps.map! {|dep| Util.absolute_path(dep)}
       Array(targets).each do |target|
-        abstarget = Util.absolute_path(target)
-        cache_key = get_cache_key(abstarget)
+        target = Util.absolute_path(target)
+        cache_key = get_cache_key(target)
 
-        unless Rscons.phony_target?(abstarget)
+        unless Rscons.phony_target?(target)
           # target file must exist on disk
-          unless File.exist?(abstarget)
-            if options[:debug]
-              puts "Target #{target} needs rebuilding because it does not exist on disk"
+          unless File.exist?(target)
+            if options[:debug] || ENV["RSCONS_CACHE_DEBUG"]
+              puts "Cache: up_to_date?: Target #{target} needs rebuilding because it does not exist on disk"
             end
             return false
           end
@@ -159,17 +159,17 @@ module Rscons
 
         # target must be registered in the cache
         unless @cache["targets"].has_key?(cache_key)
-          if options[:debug]
-            puts "Target #{target} needs rebuilding because there is no cached build information for it"
+          if options[:debug] || ENV["RSCONS_CACHE_DEBUG"]
+            puts "Cache: up_to_date?: Target #{target} needs rebuilding because there is no cached build information for it"
           end
           return false
         end
 
-        unless Rscons.phony_target?(abstarget)
+        unless Rscons.phony_target?(target)
           # target must have the same checksum as when it was built last
-          unless @cache["targets"][cache_key]["checksum"] == lookup_checksum(abstarget)
-            if options[:debug]
-              puts "Target #{target} needs rebuilding because it has been changed on disk since being built last"
+          unless @cache["targets"][cache_key]["checksum"] == lookup_checksum(target)
+            if options[:debug] || ENV["RSCONS_CACHE_DEBUG"]
+              puts "Cache: up_to_date?: Target #{target} needs rebuilding because it has been changed on disk since being built last"
             end
             return false
           end
@@ -177,8 +177,8 @@ module Rscons
 
         # command used to build target must be identical
         unless @cache["targets"][cache_key]["command"] == Digest::MD5.hexdigest(command.inspect)
-          if options[:debug]
-            puts "Target #{target} needs rebuilding because the command used to build it has changed"
+          if options[:debug] || ENV["RSCONS_CACHE_DEBUG"]
+            puts "Cache: up_to_date?: Target #{target} needs rebuilding because the command used to build it has changed"
           end
           return false
         end
@@ -188,28 +188,29 @@ module Rscons
         if options[:strict_deps]
           # depedencies passed in must exactly equal those in the cache
           unless deps == cached_deps_fnames
-            if options[:debug]
-              puts "Target #{target} needs rebuilding because the :strict_deps option is given and the set of dependencies does not match the previous set of dependencies"
+            if options[:debug] || ENV["RSCONS_CACHE_DEBUG"]
+              puts "Cache: up_to_date?: Target #{target} needs rebuilding because the :strict_deps option is given and the set of dependencies does not match the previous set of dependencies"
             end
             return false
           end
         else
           # all dependencies passed in must exist in cache (but cache may have more)
           unless (Set.new(deps) - Set.new(cached_deps_fnames)).empty?
-            if options[:debug]
-              puts "Target #{target} needs rebuilding because there are new dependencies"
+            if options[:debug] || ENV["RSCONS_CACHE_DEBUG"]
+              puts "Cache: up_to_date?: Target #{target} needs rebuilding because there are new dependencies"
             end
             return false
           end
         end
 
         # set of user dependencies must match
-        user_deps = env.get_user_deps(abstarget) || []
+        user_deps = env.get_user_deps(target) || []
+        user_deps.map! {|dep| Util.absolute_path(dep)}
         cached_user_deps = @cache["targets"][cache_key]["user_deps"] || []
         cached_user_deps_fnames = cached_user_deps.map { |dc| dc["fname"] }
         unless user_deps == cached_user_deps_fnames
-          if options[:debug]
-            puts "Target #{target} needs rebuilding because the set of user-specified dependency files has changed"
+          if options[:debug] || ENV["RSCONS_CACHE_DEBUG"]
+            puts "Cache: up_to_date?: Target #{target} needs rebuilding because the set of user-specified dependency files has changed"
           end
           return false
         end
@@ -217,12 +218,14 @@ module Rscons
         # all cached dependencies must have their checksums match
         (cached_deps + cached_user_deps).each do |dep_cache|
           unless dep_cache["checksum"] == lookup_checksum(dep_cache["fname"])
-            if options[:debug]
-              puts "Target #{target} needs rebuilding because dependency file #{dep_cache["fname"]} has changed"
+            if options[:debug] || ENV["RSCONS_CACHE_DEBUG"]
+              puts "Cache: up_to_date?: Target #{target} needs rebuilding because dependency file #{dep_cache["fname"]} has changed"
             end
             return false
           end
         end
+
+        puts "Cache: up_to_date?: Target #{target} is up to date" if ENV["RSCONS_CACHE_DEBUG"]
       end
 
       true
@@ -256,19 +259,19 @@ module Rscons
           else
             calculate_checksum(target)
           end
-        deps = deps.map do |dep|
-          Util.absolute_path(dep)
-        end.uniq
+        puts "Cache: register_build(#{target}, #{target_checksum})"
         @cache["targets"][get_cache_key(target)] = {
           "command" => Digest::MD5.hexdigest(command.inspect),
           "checksum" => target_checksum,
           "deps" => deps.map do |dep|
+            dep = Util.absolute_path(dep)
             {
               "fname" => dep,
               "checksum" => lookup_checksum(dep),
             }
           end,
           "user_deps" => (env.get_user_deps(target) || []).map do |dep|
+            dep = Util.absolute_path(dep)
             {
               "fname" => dep,
               "checksum" => lookup_checksum(dep),
@@ -387,6 +390,8 @@ module Rscons
     #
     # @return [String] The file's checksum.
     def lookup_checksum(file)
+      file = Util.absolute_path(file)
+      puts "Cache: lookup_checksum(#{file})" if ENV["RSCONS_CACHE_DEBUG"]
       @lookup_checksums[file] || calculate_checksum(file)
     end
 
@@ -396,7 +401,10 @@ module Rscons
     #
     # @return [String] The file's checksum.
     def calculate_checksum(file)
-      @lookup_checksums[file] = Digest::MD5.hexdigest(File.read(file, mode: "rb")) rescue ""
+      file = Util.absolute_path(file)
+      cs = Digest::MD5.hexdigest(File.read(file, mode: "rb")) rescue ""
+      puts "Cache: calculate_checksum(#{file}) = #{cs}" if ENV["RSCONS_CACHE_DEBUG"]
+      @lookup_checksums[file] = cs
     end
 
   end

lib/rscons/default_construction_variables.rb

@@ -43,6 +43,8 @@ module Rscons
     "DFLAGS" => [],
     "DISASM_CMD" => %w[${OBJDUMP} ${DISASM_FLAGS} ${_SOURCES}],
     "DISASM_FLAGS" => %w[--disassemble --source],
+    "DPC_CMD:ldc" => %w[${DC} -H -Hf ${_TARGET} -o- ${INCPREFIX}${D_IMPORT_PATH} ${DFLAGS} ${_SOURCES}],
+    "DPC_CMD:gdc" => %w[${DC} -H -Hf ${_TARGET} -fsyntax-only ${INCPREFIX}${D_IMPORT_PATH} ${DFLAGS} ${_SOURCES}],
     "DSUFFIX" => %w[.d],
     "D_IMPORT_PATH" => [],
     "INCPREFIX" => "-I",

lib/rscons/environment.rb

@@ -291,6 +291,17 @@ module Rscons
       end
     end
 
+    # Get a path under the build root for precompile outputs.
+    #
+    # @param end_path [String]
+    #   Path to append to precompile build root.
+    #
+    # @return [String]
+    #   Precompile directory name.
+    def get_pc_build_dir(end_path)
+      "#{@build_root}/pc/#{Util.make_relative_path(end_path)}"
+    end
+
     # Build all build targets specified in the Environment.
     #
     # When a block is passed to Environment.new, this method is automatically
@@ -371,8 +382,8 @@ module Rscons
           @builder_sets << build_builder_set
         end
         @builder_sets.last << builder
-        @build_steps += 1 unless builder.is_a?(Rscons::Builders::Barrier)
-        @build_targets[builder.abstarget] = builder
+        @build_steps += 1
+        @build_targets[target] = builder
         builder
       else
         super
@@ -389,19 +400,19 @@ module Rscons
       if target.is_a?(Builder)
         target = target.target
       end
-      target = expand(target.to_s)
+      unless Rscons.phony_target?(target)
+        target = Util.absolute_path(expand(target))
+      end
       user_deps = user_deps.map do |ud|
         if ud.is_a?(Builder)
           ud = ud.target
         end
         expand(ud)
       end
-      target = Util.absolute_path(target)
       @user_deps[target] ||= []
-      user_deps.map! {|ud| Util.absolute_path(ud)}
       user_deps.each do |ud|
-        unless Rscons.phony_target?(ud) || @user_deps[target].include?(ud)
-          @user_deps[target] << ud
+        unless @user_deps[target].include?(ud)
+          @user_deps[target] << Util.absolute_path(ud)
         end
       end
       build_after(target, user_deps)
@@ -434,14 +445,16 @@ module Rscons
       targets = Array(targets)
       prerequisites = Array(prerequisites)
       targets.each do |target|
-        target = Util.absolute_path(expand(target))
+        unless Rscons.phony_target?(target)
+          target = Util.absolute_path(expand(target))
+        end
         @registered_build_dependencies[target] ||= Set.new
         prerequisites.each do |prerequisite|
           if prerequisite.is_a?(Builder)
             prerequisite = prerequisite.target
           end
-          prerequisite = Util.absolute_path(expand(prerequisite))
-          @registered_build_dependencies[target] << prerequisite
+          prerequisite = expand(prerequisite)
+          @registered_build_dependencies[target] << Util.absolute_path(prerequisite)
         end
       end
     end
@@ -456,9 +469,9 @@ module Rscons
     #
     # @return [void]
     def produces(target, *side_effects)
-      abstarget = Util.absolute_path(expand(target))
+      target = Util.absolute_path(expand(target))
       @builder_sets.reverse.each do |builder_set|
-        if builders = builder_set[abstarget]
+        if builders = builder_set[target]
           builders.last.produces(*side_effects)
           return
         end
@@ -475,7 +488,7 @@ module Rscons
     # @param side_effect [String]
     #   Side effect fiel name.
     def register_side_effect(side_effect)
-      @side_effects << Util.absolute_path(side_effect)
+      @side_effects << side_effect
     end
 
     # Return the list of user dependencies for a given target.
@@ -486,7 +499,6 @@ module Rscons
     #   List of user-specified dependencies for the target, or nil if none were
     #   specified.
     def get_user_deps(target)
-      target = Util.absolute_path(target)
       @user_deps[target]
     end
 
@@ -510,11 +522,10 @@ module Rscons
     # @return [String]
     #   Output file name.
     def register_dependency_build(target, source, suffix, vars, builder_class)
-      target = Util.absolute_path(target)
       output_fname = get_build_fname(source, suffix, builder_class)
       self.__send__(builder_class.name, output_fname, source, vars)
       @registered_build_dependencies[target] ||= Set.new
-      @registered_build_dependencies[target] << Util.absolute_path(output_fname)
+      @registered_build_dependencies[target] << output_fname
       output_fname
     end
 
@@ -591,7 +602,6 @@ module Rscons
     # @return [Builder, nil]
     #   The {Builder} for target, or +nil+ if none found.
     def builder_for(target)
-      target = Util.absolute_path(target)
       @build_targets[target]
     end
 
@@ -605,6 +615,42 @@ module Rscons
       @builder_sets << build_builder_set
     end
 
+    # Set up builders and barrier for a precompile phase if needed.
+    #
+    # @param sources [Array<String>]
+    #   Sources for the build operation.
+    #
+    # @return [Symbol, nil]
+    #   Barrier target name if a precompile phase is needed, otherwise nil.
+    def setup_precompile(sources)
+      barrier_target = nil
+      precompile_paths = Set.new
+      sources.each do |source|
+        next unless source.end_with?(".d")
+        unless barrier_target
+          barrier_target = Rscons.gen_phony_target
+          self.Barrier(barrier_target)
+        end
+        next unless module_name = Util.get_module_name(source)
+        next unless import_path = Util.find_import_path_for_d_source(self["D_IMPORT_PATH"], source, module_name)
+        precompile_path = get_pc_build_dir(import_path)
+        unless precompile_paths.include?(precompile_path)
+          Util.clean_d_precompile_path(precompile_path, import_path)
+          precompile_paths << precompile_path
+        end
+        unless self["D_IMPORT_PATH"].include?(precompile_path)
+          # Put the precompile path containing the .di files for the given
+          # import path immediately before the import path.
+          index = self["D_IMPORT_PATH"].find_index {|ip| ip == import_path}
+          self["D_IMPORT_PATH"].insert(index, precompile_path)
+        end
+        pctarget = "#{precompile_path}/#{module_name.gsub(".", "/")}.di"
+        self.Precompile(pctarget, source)
+        self.depends(barrier_target, pctarget)
+      end
+      barrier_target
+    end
+
     private
 
     # Build a BuilderSet.
@@ -735,7 +781,7 @@ module Rscons
       # If no builder was found to run yet and there are threads available, try
       # to get a runnable builder from the builder set.
       targets_still_building = @threads.reduce([]) do |result, (thread, obj)|
-        result << builder_for_thread(thread).abstarget
+        result << Util.absolute_path(builder_for_thread(thread).target)
       end
       if @builder_sets.size > 0
         if builder = @builder_sets[0].get_next_builder_to_run(targets_still_building)

lib/rscons/script.rb

@@ -34,15 +34,7 @@ module Rscons
       #
       # @return [Array<String>] Paths matching the specified pattern(s).
       def glob(*patterns)
-        require "pathname"
-        patterns.reduce([]) do |result, pattern|
-          if pattern.end_with?("/**")
-            pattern += "/"
-          end
-          result += Dir.glob(pattern).map do |path|
-            Pathname.new(path.gsub("\\", "/")).cleanpath.to_s
-          end
-        end.sort
+        Util.glob(*patterns)
       end
 
       # Download a file.

lib/rscons/util.rb

@@ -16,18 +16,39 @@ module Rscons
         end
       end
 
-      # Return the absolute path for a given target if not a phony target.
+      # Get the absolute path for a given path.
       #
-      # @param path [String, Symbol, nil]
-      #   Given target name.
+      # If the path is a phony target, leave it as is.
       #
-      # @return [String, Symbol, nil]
-      #   Absolute path of given target.
+      # @param path [String, Symbol]
+      #   Input path.
+      #
+      # @return [String, Symbol]
+      #   Output path.
       def absolute_path(path)
-        if path.is_a?(String)
-          File.expand_path(path)
-        else
+        if Rscons.phony_target?(path)
           path
+        else
+          File.expand_path(path)
+        end
+      end
+
+      # Remove any stale .di files from the precompile path.
+      #
+      # @param pc_path [String]
+      #   Path to precompile build directory containing .di generated
+      #   interface files.
+      # @param import_path [String]
+      #   D import path containing .d source files.
+      #
+      # @return [void]
+      def clean_d_precompile_path(pc_path, import_path)
+        glob("#{pc_path}/**/*.di").each do |di_path|
+          end_path = di_path[(pc_path.size+1)..]
+          path = "#{import_path}/#{end_path}".sub(/\.di$/, ".d")
+          unless File.exist?(path)
+            FileUtils.rm_f(path)
+          end
         end
       end
 
@@ -135,6 +156,29 @@ module Rscons
         end
       end
 
+      # Find the D import path that will be used to import the given module.
+      #
+      # @param import_paths [Array<String>]
+      #   Import paths.
+      # @param source [String]
+      #   Source file name.
+      # @param module_name [String]
+      #   Module name.
+      #
+      # @return [String, nil]
+      #   Import path used to import the given module.
+      def find_import_path_for_d_source(import_paths, source, module_name)
+        source = source.gsub("\\", "/")
+        module_path = module_name.gsub(".", "/") + ".d"
+        import_paths.each do |import_path|
+          path = "#{import_path}/#{module_path}".gsub("\\", "/")
+          if path == source
+            return import_path
+          end
+        end
+        nil
+      end
+
       # Format an elapsed time in human-readable format.
       #
       # @return [String]
@@ -156,6 +200,52 @@ module Rscons
         result
       end
 
+      # Get the module name for a D source file.
+      #
+      # @param source_path [String]
+      #   D source file.
+      #
+      # @return [String, nil]
+      #   Module name.
+      def get_module_name(source_path)
+        if File.exist?(source_path)
+          if File.binread(source_path) =~ /^\s*module\s(\S*);/
+            return $1
+          end
+          name = File.basename(source_path).sub(/\.d$/, "")
+          if name =~ /^\w+$/
+            return name
+          end
+        end
+      end
+
+      # Return a list of paths matching the specified pattern(s).
+      #
+      # A pattern can contain a "/**" component to recurse through directories.
+      # If the pattern ends with "/**" then only the recursive list of
+      # directories will be returned.
+      #
+      # Examples:
+      # - "src/**": return all directories under "src", recursively (including
+      #   "src" itself).
+      # - "src/**/*": return all files and directories recursively under the src
+      #   directory.
+      # - "src/**/*.c": return all .c files recursively under the src directory.
+      # - "dir/*/": return all directories in dir, but no files.
+      #
+      # @return [Array<String>] Paths matching the specified pattern(s).
+      def glob(*patterns)
+        require "pathname"
+        patterns.reduce([]) do |result, pattern|
+          if pattern.end_with?("/**")
+            pattern += "/"
+          end
+          result += Dir.glob(pattern).map do |path|
+            Pathname.new(path.gsub("\\", "/")).cleanpath.to_s
+          end
+        end.sort
+      end
+
       # Make a relative path corresponding to a possibly absolute one.
       #
       # @param path [String]

spec/rscons/environment_spec.rb

@@ -138,6 +138,27 @@ module Rscons
       end
     end
 
+    describe "#depends" do
+      it "records the given dependencies in @user_deps" do
+        env = Environment.new
+        env.depends("foo", "bar", "baz")
+        expect(env.instance_variable_get(:@user_deps)).to eq({"foo" => ["bar", "baz"]})
+      end
+      it "records user dependencies only once" do
+        env = Environment.new
+        env.instance_variable_set(:@user_deps, {"foo" => ["bar"]})
+        env.depends("foo", "bar", "baz")
+        expect(env.instance_variable_get(:@user_deps)).to eq({"foo" => ["bar", "baz"]})
+      end
+      it "expands arguments for construction variable references" do
+        env = Environment.new
+        env["foo"] = "foo.exe"
+        env["bar"] = "bar.c"
+        env.depends("${foo}", "${bar}", "a.h")
+        expect(env.instance_variable_get(:@user_deps)).to eq({"foo.exe" => ["bar.c", "a.h"]})
+      end
+    end
+
     describe "#shell" do
       it "executes the given shell command and returns the results" do
         env = Environment.new

spec/spec_helper.rb

@@ -1,12 +1,8 @@
 if ENV["rscons_dist_specs"]
-  require_relative "../test_run/rscons"
+  require_relative "../test/rscons"
 else
   require "simplecov"
 
-  class MyFormatter
-    def format(*args)
-    end
-  end
   SimpleCov.start do
     add_filter "/spec/"
     add_filter "/.bundle/"
@@ -15,10 +11,9 @@ else
     else
       command_name "RSpec"
     end
-    add_filter "test_run/rscons.rb"
+    add_filter "test/rscons.rb"
     project_name "Rscons"
     merge_timeout 3600
-    formatter(MyFormatter)
   end
 
   require "rscons"