[dev.cc] cmd/dist, cmd/go: stop building C implementations of compilers, assemblers

Also stop building objwriter, which was only used by them.

Change-Id: Ia2353abd9426026a81a263cb46a72dd39c360ce4
Reviewed-on: https://go-review.googlesource.com/5634Reviewed-by: Rob Pike <r@golang.org>

src/cmd/dist/build.go

@@ -536,21 +536,6 @@ var deptab = []struct {
 		"anames8.c",
 		"anames9.c",
 	}},
-	{"cmd/gc", []string{
-		"opnames.h",
-	}},
-	{"cmd/5g", []string{
-		"$GOROOT/pkg/obj/${GOHOSTOS}_$GOHOSTARCH/libgc.a",
-	}},
-	{"cmd/6g", []string{
-		"$GOROOT/pkg/obj/${GOHOSTOS}_$GOHOSTARCH/libgc.a",
-	}},
-	{"cmd/8g", []string{
-		"$GOROOT/pkg/obj/${GOHOSTOS}_$GOHOSTARCH/libgc.a",
-	}},
-	{"cmd/9g", []string{
-		"$GOROOT/pkg/obj/${GOHOSTOS}_$GOHOSTARCH/libgc.a",
-	}},
 	{"cmd/5l", []string{
 		"$GOROOT/pkg/obj/${GOHOSTOS}_$GOHOSTARCH/libld.a",
 	}},
@@ -589,7 +574,6 @@ var gentab = []struct {
 	nameprefix string
 	gen        func(string, string)
 }{
-	{"opnames.h", gcopnames},
 	{"anames5.c", mkanames},
 	{"anames6.c", mkanames},
 	{"anames8.c", mkanames},
@@ -656,10 +640,10 @@ func install(dir string) {
 	case "lib9", "libbio", "liblink", "cmd/gc", "cmd/ld":
 		islib = true
 		isgo = false
-	case "cmd/5a", "cmd/5g", "cmd/5l",
-		"cmd/6a", "cmd/6g", "cmd/6l",
-		"cmd/8a", "cmd/8g", "cmd/8l",
-		"cmd/9a", "cmd/9g", "cmd/9l":
+	case "cmd/5l",
+		"cmd/6l",
+		"cmd/8l",
+		"cmd/9l":
 		isgo = false
 	}
 
@@ -1134,12 +1118,8 @@ var buildorder = []string{
 	"lib9",
 	"libbio",
 	"liblink",
-
-	"cmd/gc",  // must be before g
 	"cmd/ld",  // must be before l
 	"cmd/%sl", // must be before a, g
-	"cmd/%sa",
-	"cmd/%sg",
 
 	// Go libraries and programs for bootstrap.
 	"runtime",
@@ -1184,12 +1164,6 @@ var buildorder = []string{
 	"text/template",
 	"go/doc",
 	"go/build",
-	"cmd/internal/obj",
-	"cmd/internal/obj/arm",
-	"cmd/internal/obj/i386",
-	"cmd/internal/obj/ppc64",
-	"cmd/internal/obj/x86",
-	"cmd/objwriter",
 	"cmd/go",
 }
 
@@ -1210,7 +1184,6 @@ var cleantab = []string{
 	"cmd/9a",
 	"cmd/9g",
 	"cmd/9l",
-	"cmd/gc",
 	"cmd/go",
 	"lib9",
 	"libbio",

src/cmd/dist/buildtool.go

@@ -23,6 +23,14 @@ import (
 // which are commands, and entries beginning with internal/, which are
 // packages supporting the commands.
 var bootstrapDirs = []string{
+	"5a",
+	"5g",
+	"6a",
+	"6g",
+	"8a",
+	"8g",
+	"9a",
+	"9g",
 	"asm",
 	"asm/internal/arch",
 	"asm/internal/asm",
@@ -35,15 +43,6 @@ var bootstrapDirs = []string{
 	"internal/obj/i386",
 	"internal/obj/ppc64",
 	"internal/obj/x86",
-	"new5a",
-	"new6a",
-	"new8a",
-	"new9a",
-	"new5g",
-	"new6g",
-	"new8g",
-	"new9g",
-	"objwriter",
 }
 
 func bootstrapBuildTools() {

src/cmd/go/build.go

@@ -1645,11 +1645,6 @@ func (gcToolchain) linker() string {
 	return tool(archChar + "l")
 }
 
-// verifyCompiler specifies whether to check the compilers written in Go
-// against the assemblers written in C. If set, asm will run both (say) 6g and new6g
-// and fail if the two produce different output files.
-const verifyCompiler = true
-
 func (gcToolchain) gc(b *builder, p *Package, archive, obj string, asmhdr bool, importArgs []string, gofiles []string) (ofile string, output []byte, err error) {
 	if archive != "" {
 		ofile = archive
@@ -1695,11 +1690,6 @@ func (gcToolchain) gc(b *builder, p *Package, archive, obj string, asmhdr bool,
 	}
 
 	output, err = b.runOut(p.Dir, p.ImportPath, nil, args...)
-	if err == nil && verifyCompiler {
-		if err := toolVerify(b, p, "new"+archChar+"g", ofile, args); err != nil {
-			return ofile, output, err
-		}
-	}
 	return ofile, output, err
 }
 
@@ -1717,9 +1707,6 @@ func (gcToolchain) asm(b *builder, p *Package, obj, ofile, sfile string) error {
 		return err
 	}
 	if verifyAsm {
-		if err := toolVerify(b, p, "new"+archChar+"a", ofile, args); err != nil {
-			return err
-		}
 		if err := toolVerify(b, p, "asm", ofile, args); err != nil {
 			return err
 		}

src/cmd/go/pkg.go

@@ -391,6 +391,14 @@ const (
 
 // goTools is a map of Go program import path to install target directory.
 var goTools = map[string]targetDir{
+	"cmd/5a":                               toTool,
+	"cmd/5g":                               toTool,
+	"cmd/6a":                               toTool,
+	"cmd/6g":                               toTool,
+	"cmd/8a":                               toTool,
+	"cmd/8g":                               toTool,
+	"cmd/9a":                               toTool,
+	"cmd/9g":                               toTool,
 	"cmd/addr2line":                        toTool,
 	"cmd/api":                              toTool,
 	"cmd/asm":                              toTool,
@@ -398,17 +406,8 @@ var goTools = map[string]targetDir{
 	"cmd/dist":                             toTool,
 	"cmd/fix":                              toTool,
 	"cmd/link":                             toTool,
-	"cmd/new5a":                            toTool,
-	"cmd/new6a":                            toTool,
-	"cmd/new8a":                            toTool,
-	"cmd/new9a":                            toTool,
-	"cmd/new5g":                            toTool,
-	"cmd/new6g":                            toTool,
-	"cmd/new8g":                            toTool,
-	"cmd/new9g":                            toTool,
 	"cmd/nm":                               toTool,
 	"cmd/objdump":                          toTool,
-	"cmd/objwriter":                        toTool,
 	"cmd/pack":                             toTool,
 	"cmd/pprof":                            toTool,
 	"cmd/trace":                            toTool,