Add support for Windows Message Compiler

We've only got one user of this currently, but since it needs the
location of the toolchain, and different flags based on 32 vs 64-bit,
it's easier just to add support than to get this into a genrule.

Test: Convert external/mdnsresponder to Soong, build
Change-Id: I6c19a82bc14f6ab556f6cc5f37164862ba5f9083

cc/builder.go

@@ -158,6 +158,13 @@ var (
 		},
 		"asFlags")
 
+	windres = pctx.AndroidStaticRule("windres",
+		blueprint.RuleParams{
+			Command:     "$windresCmd $flags -I$$(dirname $in) -i $in -o $out",
+			CommandDeps: []string{"$windresCmd"},
+		},
+		"windresCmd", "flags")
+
 	_ = pctx.SourcePathVariable("sAbiDumper", "prebuilts/build-tools/${config.HostPrebuiltTag}/bin/header-abi-dumper")
 
 	// -w has been added since header-abi-dumper does not need to produce any sort of diagnostic information.
@@ -332,7 +339,8 @@ func TransformSourceToObj(ctx android.ModuleContext, subdir string, srcFiles and
 
 		objFiles[i] = objFile
 
-		if srcFile.Ext() == ".asm" {
+		switch srcFile.Ext() {
+		case ".asm":
 			ctx.ModuleBuild(pctx, android.ModuleBuildParams{
 				Rule:        yasm,
 				Description: "yasm " + srcFile.Rel(),
@@ -344,6 +352,19 @@ func TransformSourceToObj(ctx android.ModuleContext, subdir string, srcFiles and
 				},
 			})
 			continue
+		case ".rc":
+			ctx.ModuleBuild(pctx, android.ModuleBuildParams{
+				Rule:        windres,
+				Description: "windres " + srcFile.Rel(),
+				Output:      objFile,
+				Input:       srcFile,
+				OrderOnly:   deps,
+				Args: map[string]string{
+					"windresCmd": gccCmd(flags.toolchain, "windres"),
+					"flags":      flags.toolchain.WindresFlags(),
+				},
+			})
+			continue
 		}
 
 		var moduleCflags string

cc/compiler.go

@@ -429,6 +429,11 @@ func (compiler *baseCompiler) compilerFlags(ctx ModuleContext, flags Flags) Flag
 			"-I"+android.PathForModuleGen(ctx, "yacc", ctx.ModuleDir()).String())
 	}
 
+	if compiler.hasSrcExt(".mc") {
+		flags.GlobalFlags = append(flags.GlobalFlags,
+			"-I"+android.PathForModuleGen(ctx, "windmc", ctx.ModuleDir()).String())
+	}
+
 	if compiler.hasSrcExt(".aidl") {
 		if len(compiler.Properties.Aidl.Local_include_dirs) > 0 {
 			localAidlIncludeDirs := android.PathsForModuleSrc(ctx, compiler.Properties.Aidl.Local_include_dirs)

cc/config/toolchain.go

@@ -70,6 +70,8 @@ type Toolchain interface {
 
 	YasmFlags() string
 
+	WindresFlags() string
+
 	Is64Bit() bool
 
 	ShlibSuffix() string
@@ -135,6 +137,10 @@ func (toolchainBase) YasmFlags() string {
 	return ""
 }
 
+func (toolchainBase) WindresFlags() string {
+	return ""
+}
+
 func (toolchainBase) SanitizerRuntimeLibraryArch() string {
 	return ""
 }

cc/config/x86_windows_host.go

@@ -172,6 +172,14 @@ func (t *toolchainWindows) IncludeFlags() string {
 	return "${config.WindowsIncludeFlags}"
 }
 
+func (t *toolchainWindowsX86) WindresFlags() string {
+	return "-F pe-i386"
+}
+
+func (t *toolchainWindowsX8664) WindresFlags() string {
+	return "-F pe-x86-64"
+}
+
 func (t *toolchainWindows) ClangSupported() bool {
 	return false
 }

cc/gen.go

@@ -54,6 +54,13 @@ var (
 			Deps:        blueprint.DepsGCC,
 		},
 		"aidlFlags", "outDir")
+
+	windmc = pctx.AndroidStaticRule("windmc",
+		blueprint.RuleParams{
+			Command:     "$windmcCmd -r$$(dirname $out) -h$$(dirname $out) $in",
+			CommandDeps: []string{"$windmcCmd"},
+		},
+		"windmcCmd")
 )
 
 func genYacc(ctx android.ModuleContext, yaccFile android.Path, outFile android.ModuleGenPath, yaccFlags string) (headerFile android.ModuleGenPath) {
@@ -100,6 +107,26 @@ func genLex(ctx android.ModuleContext, lexFile android.Path, outFile android.Mod
 	})
 }
 
+func genWinMsg(ctx android.ModuleContext, srcFile android.Path, flags builderFlags) (android.Path, android.Path) {
+	headerFile := android.GenPathWithExt(ctx, "windmc", srcFile, "h")
+	rcFile := android.GenPathWithExt(ctx, "windmc", srcFile, "rc")
+
+	windmcCmd := gccCmd(flags.toolchain, "windmc")
+
+	ctx.ModuleBuild(pctx, android.ModuleBuildParams{
+		Rule:           windmc,
+		Description:    "windmc " + srcFile.Rel(),
+		Output:         rcFile,
+		ImplicitOutput: headerFile,
+		Input:          srcFile,
+		Args: map[string]string{
+			"windmcCmd": windmcCmd,
+		},
+	})
+
+	return rcFile, headerFile
+}
+
 func genSources(ctx android.ModuleContext, srcFiles android.Paths,
 	buildFlags builderFlags) (android.Paths, android.Paths) {
 
@@ -137,6 +164,10 @@ func genSources(ctx android.ModuleContext, srcFiles android.Paths,
 			cppFile := rsGeneratedCppFile(ctx, srcFile)
 			rsFiles = append(rsFiles, srcFiles[i])
 			srcFiles[i] = cppFile
+		case ".mc":
+			rcFile, headerFile := genWinMsg(ctx, srcFile, buildFlags)
+			srcFiles[i] = rcFile
+			deps = append(deps, headerFile)
 		}
 	}