update build_tests_spec to invoke rscons in a subprocess for each test

build_tests/build_dir/Rsconsfile

@@ -0,0 +1,5 @@
+Rscons::Environment.new do |env|
+  env.append('CPPPATH' => Dir['src/**/*/'].sort)
+  env.build_dir(%r{^src/([^/]+)/}, 'build_\\1/')
+  env.Program('build_dir.exe', Dir['src/**/*.c'])
+end

build_tests/build_dir/build_dirs_and_root.rb

@@ -0,0 +1,6 @@
+env = Rscons::Environment.new do |env|
+  env.append('CPPPATH' => Dir['src/**/*/'].sort)
+  env.build_dir("src", "build")
+  env.build_root = "build_root"
+  env.Program('build_dir.exe', Dir['src/**/*.c'])
+end

build_tests/build_dir/build_hooks.rb

@@ -0,0 +1,12 @@
+Rscons::Environment.new(echo: :command) do |env|
+  env.append('CPPPATH' => Dir['src/**/*/'].sort)
+  env.build_dir(%r{^src/([^/]+)/}, 'build_\\1/')
+  env.add_build_hook do |build_op|
+    if build_op[:target] =~ %r{build_one/.*\.o}
+      build_op[:vars]["CFLAGS"] << "-O1"
+    elsif build_op[:target] =~ %r{build_two/.*\.o}
+      build_op[:vars]["CFLAGS"] << "-O2"
+    end
+  end
+  env.Program('build_hook.exe', Dir['src/**/*.c'].sort)
+end

build_tests/build_dir/carat.rb

@@ -0,0 +1,8 @@
+Rscons::Environment.new(echo: :command) do |env|
+  env.append('CPPPATH' => Dir['src/**/*/'].sort)
+  env.build_root = "build_root"
+  FileUtils.mkdir_p(env.build_root)
+  FileUtils.mv("src/one/one.c", "build_root")
+  env.Object("^/one.o", "^/one.c")
+  env.Program("build_dir.exe", Dir['src/**/*.c'] + ["^/one.o"])
+end

build_tests/build_dir/copy.rb

@@ -0,0 +1,3 @@
+Rscons::Environment.new do |env|
+  env.Copy("inst.exe", "copy.rb")
+end

build_tests/build_dir/csuffix.rb

@@ -0,0 +1,6 @@
+Rscons::Environment.new do |env|
+  env["CSUFFIX"] = %w[.yargh .c]
+  env["CFLAGS"] += %w[-x c]
+  env["CPPPATH"] += Dir["src/**/"]
+  env.Program("build_dir.exe", Dir["src/**/*.{c,yargh}"])
+end

build_tests/build_dir/install.rb

@@ -0,0 +1,3 @@
+Rscons::Environment.new do |env|
+  env.Install("inst.exe", "install.rb")
+end

build_tests/build_dir/install_directory.rb

@@ -0,0 +1,9 @@
+Rscons::Environment.new do |env|
+  env.Directory("inst")
+  env.Install("inst", "install_directory.rb")
+
+  env.Install("noexist/src", "src")
+
+  env.Directory("exist/src")
+  env.Install("exist/src", "src")
+end

build_tests/build_dir/multiple_targets_same_name.rb

@@ -0,0 +1,5 @@
+Rscons::Environment.new do |env|
+  env["CPPPATH"] << "src/two"
+  env.Object("one.o", "src/one/one.c")
+  env.Object("one.o", "src/two/two.c")
+end

build_tests/build_dir/no_match_build_dir.rb

@@ -0,0 +1,6 @@
+Rscons::Environment.new do |env|
+  env.append('CPPPATH' => Dir['src/**/*/'].sort)
+  env.build_dir("src2", "build")
+  env.build_root = "build_root"
+  env.Program('build_dir.exe', Dir['src/**/*.c'])
+end

build_tests/build_dir/post_build_hook_expansion.rb

@@ -0,0 +1,10 @@
+Rscons::Environment.new do |env|
+  env["CPPPATH"] << "src/two"
+  env.Object("one.o", "src/one/one.c")
+  env.add_post_build_hook do |build_op|
+    if build_op[:target] == "one.o"
+      env["MODULE"] = "two"
+      env.Object("${MODULE}.o", "src/${MODULE}/${MODULE}.c")
+    end
+  end
+end

build_tests/build_dir/slashes.rb

@@ -0,0 +1,6 @@
+Rscons::Environment.new do |env|
+  env.append("CPPPATH" => Dir["src/**/*/"].sort)
+  env.build_dir("src/one/", "build_one/")
+  env.build_dir("src/two", "build_two")
+  env.Program("build_dir.exe", Dir["src/**/*.c"])
+end