Add shortcut method for creating environments - close #149

Add env() method to create environments.
Process all environments created at build script top level before
executing any autoconf-enabled tasks, or if no tasks are specified by
the user.

build_tests/configure/autoconf_false.rb

@@ -1,3 +1,3 @@
 autoconf false
-Environment.new do |env|
+env do |env|
 end

build_tests/configure/autoconf_rebuild.rb

@@ -3,8 +3,6 @@ configure do
   check_c_header "stdio.h"
 end
 
-default do
-  Environment.new do |env|
-    env.Program("simple.exe", "simple.c")
-  end
+env do |env|
+  env.Program("simple.exe", "simple.c")
 end

build_tests/configure/check_c_header_cpppath.rb

@@ -3,8 +3,6 @@ configure do
   check_c_header "frobulous.h", check_cpppath: ["./usr2"]
 end
 
-default do
-  Environment.new do |env|
-    env.Object("test.o", "test.c")
-  end
+env do |env|
+  env.Object("test.o", "test.c")
 end

build_tests/configure/check_c_header_no_fail_set_define.rb

@@ -2,8 +2,6 @@ configure do
   check_c_header "not___found.h", set_define: "HAVE_NOT___FOUND_H"
 end
 
-default do
-  Environment.new(echo: :command) do |env|
-    env.Object("simple.o", "simple.c")
-  end
+env(echo: :command) do |env|
+  env.Object("simple.o", "simple.c")
 end

build_tests/configure/check_c_header_success_set_define.rb

@@ -2,8 +2,6 @@ configure do
   check_c_header "string.h", set_define: "HAVE_STRING_H"
 end
 
-default do
-  Environment.new(echo: :command) do |env|
-    env.Object("simple.o", "simple.c")
-  end
+env(echo: :command) do |env|
+  env.Object("simple.o", "simple.c")
 end

build_tests/configure/check_cfg.rb

@@ -2,8 +2,6 @@ configure do
   check_cfg program: "my-config"
 end
 
-default do
-  Environment.new(echo: :command) do |env|
-    env.Program("myconfigtest", "simple.c")
-  end
+env(echo: :command) do |env|
+  env.Program("myconfigtest", "simple.c")
 end

build_tests/configure/check_cfg_package.rb

@@ -2,8 +2,6 @@ configure do
   check_cfg package: "mypackage"
 end
 
-default do
-  Environment.new(echo: :command) do |env|
-    env.Program("myconfigtest", "simple.c")
-  end
+env(echo: :command) do |env|
+  env.Program("myconfigtest", "simple.c")
 end

build_tests/configure/check_cfg_use.rb

@@ -2,14 +2,12 @@ configure do
   check_cfg package: "mypackage", use: "myp"
 end
 
-default do
-  Environment.new(echo: :command) do |env|
-    env.Copy("myconfigtest1.c", "simple.c")
-    env.Program("myconfigtest1.exe", "myconfigtest1.c")
-  end
-
-  Environment.new(echo: :command, use: "myp") do |env|
-    env.Copy("myconfigtest2.c", "simple.c")
-    env.Program("myconfigtest2.exe", "myconfigtest2.c")
-  end
+env(echo: :command) do |env|
+  env.Copy("myconfigtest1.c", "simple.c")
+  env.Program("myconfigtest1.exe", "myconfigtest1.c")
+end
+
+env(echo: :command, use: "myp") do |env|
+  env.Copy("myconfigtest2.c", "simple.c")
+  env.Program("myconfigtest2.exe", "myconfigtest2.c")
 end

build_tests/configure/check_cxx_header_cpppath.rb

@@ -3,8 +3,6 @@ configure do
   check_cxx_header "frobulous.h", check_cpppath: ["./usr2"]
 end
 
-default do
-  Environment.new do |env|
-    env.Object("test.o", "test.cc")
-  end
+env do |env|
+  env.Object("test.o", "test.cc")
 end

build_tests/configure/check_d_import_d_import_path.rb

@@ -4,8 +4,6 @@ configure do
   check_d_import "frobulous", check_d_import_path: ["./usr2"]
 end
 
-default do
-  Environment.new do |env|
-    env.Object("test.o", "test.d")
-  end
+env do |env|
+  env.Object("test.o", "test.d")
 end

build_tests/configure/check_lib_libpath1.rb

@@ -1,5 +1,3 @@
-default do
-  Environment.new(echo: :command) do |env|
-    env.Library("usr2/libfrobulous.a", "two.c")
-  end
+env(echo: :command) do |env|
+  env.Library("usr2/libfrobulous.a", "two.c")
 end

build_tests/configure/check_lib_libpath2.rb

@@ -3,8 +3,6 @@ configure do
   check_lib "frobulous", check_libpath: ["./usr2"]
 end
 
-default do
-  Environment.new(echo: :command) do |env|
-    env.Program("simple.exe", "simple.c")
-  end
+env(echo: :command) do |env|
+  env.Program("simple.exe", "simple.c")
 end

build_tests/configure/check_lib_success.rb

@@ -2,8 +2,6 @@ configure do
   check_lib "m"
 end
 
-default do
-  Environment.new(echo: :command) do |env|
-    env.Program("simple.exe", "simple.c")
-  end
+env(echo: :command) do |env|
+  env.Program("simple.exe", "simple.c")
 end

build_tests/configure/check_lib_use.rb

@@ -2,14 +2,12 @@ configure do
   check_lib "m", use: :m
 end
 
-default do
-  Environment.new(echo: :command) do |env|
-    env.Copy("test1.c", "simple.c")
-    env.Program("test2.exe", "test1.c")
-  end
-
-  Environment.new(echo: :command, use: %w[m]) do |env|
-    env.Copy("test2.c", "simple.c")
-    env.Program("test2.exe", "test2.c")
-  end
+env(echo: :command) do |env|
+  env.Copy("test1.c", "simple.c")
+  env.Program("test2.exe", "test1.c")
+end
+
+env(echo: :command, use: %w[m]) do |env|
+  env.Copy("test2.c", "simple.c")
+  env.Program("test2.exe", "test2.c")
 end

build_tests/configure/check_lib_use_false.rb

@@ -2,9 +2,7 @@ configure do
   check_lib "m", use: false
 end
 
-default do
-  Environment.new(echo: :command) do |env|
-    env.Copy("test1.c", "simple.c")
-    env.Program("test2.exe", "test1.c")
-  end
+env(echo: :command) do |env|
+  env.Copy("test1.c", "simple.c")
+  env.Program("test2.exe", "test1.c")
 end

build_tests/configure/custom_config_check.rb

@@ -23,8 +23,6 @@ configure do
   end
 end
 
-default do
-  Environment.new do |env|
-    puts env["CPPDEFINES"]
-  end
+env do |env|
+  puts env["CPPDEFINES"]
 end

build_tests/configure/multiple_set_define.rb

@@ -3,8 +3,6 @@ configure do
   check_c_header "stdio.h", set_define: "HAVE_STDIO_H"
 end
 
-default do
-  Environment.new(echo: :command) do |env|
-    env.Object("simple.o", "simple.c")
-  end
+env(echo: :command) do |env|
+  env.Object("simple.o", "simple.c")
 end