Add variants - #137

Add build script methods: variant, variant_group, with_variants

build_tests/variants/Rsconscript

@@ -0,0 +1,13 @@
+variant "debug"
+variant "release"
+
+with_variants do
+  env "prog" do |env|
+    if variant("debug")
+      env["CPPDEFINES"] << "DEBUG"
+    else
+      env["CPPDEFINES"] << "NDEBUG"
+    end
+    env.Program("^/prog.exe", "prog.c")
+  end
+end

build_tests/variants/error_nested_with_variants.rb

@@ -0,0 +1,5 @@
+variant "foo"
+with_variants do
+  with_variants do
+  end
+end

build_tests/variants/error_with_variants_with_empty_variant_group.rb

@@ -0,0 +1,5 @@
+variant_group
+variant_group
+variant "foo"
+with_variants do
+end

build_tests/variants/error_with_variants_without_variants.rb

@@ -0,0 +1,2 @@
+with_variants do
+end

build_tests/variants/multiple_groups.rb

@@ -0,0 +1,27 @@
+variant_group "desktop-environment" do
+  variant "kde"
+  variant "gnome"
+end
+
+variant_group "debug" do
+  variant "debug"
+  variant "release"
+end
+
+with_variants do
+  env "prog" do |env|
+    if variant("kde")
+      env["CPPDEFINES"] << "KDE"
+    end
+    if variant("gnome")
+      env["CPPDEFINES"] << "GNOME"
+    end
+    if variant("debug")
+      env["CPPDEFINES"] << "DEBUG"
+    end
+    if variant("release")
+      env["CPPDEFINES"] << "NDEBUG"
+    end
+    env.Program("^/prog.exe", "prog.c")
+  end
+end

build_tests/variants/nil_key.rb

@@ -0,0 +1,13 @@
+variant "debug"
+variant "release", key: nil
+
+with_variants do
+  env "prog" do |env|
+    if variant("debug")
+      env["CPPDEFINES"] << "DEBUG"
+    else
+      env["CPPDEFINES"] << "NDEBUG"
+    end
+    env.Program("^/prog.exe", "prog.c")
+  end
+end

build_tests/variants/prog.c

@@ -0,0 +1,4 @@
+int main(int argc, char * argv[])
+{
+    return 42;
+}