goinstall: handle .s files with gc

As a data point, with this change goinstall is able to
fully build package big out of the box.

R=rsc
CC=golang-dev
https://golang.org/cl/4264049

src/cmd/goinstall/make.go

@@ -67,12 +67,12 @@ func makeMakefile(dir, pkg string) ([]byte, os.Error) {
 		isCgo[file] = true
 	}
 
-	oFiles := make([]string, 0, len(dirInfo.cFiles))
+	cgoOFiles := make([]string, 0, len(dirInfo.cFiles))
 	for _, file := range dirInfo.cFiles {
 		if !safeName(file) {
 			return nil, os.ErrorString("unsafe name: " + file)
 		}
-		oFiles = append(oFiles, file[:len(file)-2]+".o")
+		cgoOFiles = append(cgoOFiles, file[:len(file)-2]+".o")
 	}
 
 	goFiles := make([]string, 0, len(dirInfo.goFiles))
@@ -85,8 +85,16 @@ func makeMakefile(dir, pkg string) ([]byte, os.Error) {
 		}
 	}
 
+	oFiles := make([]string, 0, len(dirInfo.sFiles))
+	for _, file := range dirInfo.sFiles {
+		if !safeName(file) {
+			return nil, os.ErrorString("unsafe name: " + file)
+		}
+		oFiles = append(oFiles, file[:len(file)-2]+".$O")
+	}
+
 	var buf bytes.Buffer
-	md := makedata{pkg, goFiles, cgoFiles, oFiles}
+	md := makedata{pkg, goFiles, oFiles, cgoFiles, cgoOFiles}
 	if err := makefileTemplate.Execute(&buf, &md); err != nil {
 		return nil, err
 	}
@@ -106,10 +114,11 @@ func safeName(s string) bool {
 
 // makedata is the data type for the makefileTemplate.
 type makedata struct {
-	Pkg      string   // package import path
-	GoFiles  []string // list of non-cgo .go files
-	CgoFiles []string // list of cgo .go files
-	OFiles   []string // list of ofiles for cgo
+	Pkg       string   // package import path
+	GoFiles   []string // list of non-cgo .go files
+	OFiles    []string // list of .$O files
+	CgoFiles  []string // list of cgo .go files
+	CgoOFiles []string // list of cgo .o files, without extension
 }
 
 var makefileTemplate = template.MustParse(`
@@ -123,6 +132,13 @@ GOFILES=\
 	{@}\
 {.end}
 
+{.end}
+{.section OFiles}
+OFILES=\
+{.repeated section OFiles}
+	{@}\
+{.end}
+
 {.end}
 {.section CgoFiles}
 CGOFILES=\
@@ -131,9 +147,9 @@ CGOFILES=\
 {.end}
 
 {.end}
-{.section OFiles}
+{.section CgoOFiles}
 CGO_OFILES=\
-{.repeated section OFiles}
+{.repeated section CgoOFiles}
 	{@}\
 {.end}
 

src/cmd/goinstall/parse.go

@@ -22,6 +22,7 @@ type dirInfo struct {
 	goFiles  []string // .go files within dir (including cgoFiles)
 	cgoFiles []string // .go files that import "C"
 	cFiles   []string // .c files within dir
+	sFiles   []string // .s files within dir
 	imports  []string // All packages imported by goFiles
 	pkgName  string   // Name of package within dir
 }
@@ -51,6 +52,7 @@ func scanDir(dir string, allowMain bool) (info *dirInfo, err os.Error) {
 	goFiles := make([]string, 0, len(dirs))
 	cgoFiles := make([]string, 0, len(dirs))
 	cFiles := make([]string, 0, len(dirs))
+	sFiles := make([]string, 0, len(dirs))
 	importsm := make(map[string]bool)
 	pkgName := ""
 	for i := range dirs {
@@ -61,13 +63,22 @@ func scanDir(dir string, allowMain bool) (info *dirInfo, err os.Error) {
 		if !goodOSArch(d.Name) {
 			continue
 		}
-		if strings.HasSuffix(d.Name, ".c") {
+
+		switch filepath.Ext(d.Name) {
+		case ".go":
+			if strings.HasSuffix(d.Name, "_test.go") {
+				continue
+			}
+		case ".c":
 			cFiles = append(cFiles, d.Name)
 			continue
-		}
-		if !strings.HasSuffix(d.Name, ".go") || strings.HasSuffix(d.Name, "_test.go") {
+		case ".s":
+			sFiles = append(sFiles, d.Name)
+			continue
+		default:
 			continue
 		}
+
 		filename := filepath.Join(dir, d.Name)
 		pf, err := parser.ParseFile(fset, filename, nil, parser.ImportsOnly)
 		if err != nil {
@@ -110,7 +121,7 @@ func scanDir(dir string, allowMain bool) (info *dirInfo, err os.Error) {
 		imports[i] = p
 		i++
 	}
-	return &dirInfo{goFiles, cgoFiles, cFiles, imports, pkgName}, nil
+	return &dirInfo{goFiles, cgoFiles, cFiles, sFiles, imports, pkgName}, nil
 }
 
 // goodOSArch returns false if the filename contains a $GOOS or $GOARCH