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go: introduce support for "go build" with gccgo.

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The use of gccgo is triggered by GC=gccgo in environment. It
still needs the standard distribution to behave properly, but
allows using the test, build, run, install subcommands with
gccgo.

R=rsc, iant, fullung
CC=golang-dev, remy
https://golang.org/cl/5562045
This commit is contained in:
Rémy Oudompheng 2012-01-27 17:05:51 -05:00 committed by Russ Cox
parent c4303aa59f
commit 45a8fae996
3 changed files with 154 additions and 40 deletions
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177
src/cmd/go/build.go
View File

@ -354,7 +354,7 @@ func (b *builder) action(mode buildMode, depMode buildMode, p *Package) *action
}
a.objdir = filepath.Join(b.work, filepath.FromSlash(a.p.ImportPath+"/_obj")) + string(filepath.Separator)
a.objpkg = filepath.Join(b.work, filepath.FromSlash(a.p.ImportPath+".a"))
a.objpkg = buildToolchain.pkgpath(b.work, a.p)
a.link = p.Name == "main"
switch mode {
@ -557,17 +557,11 @@ func (b *builder) build(a *action) error {
// Compile Go.
if len(gofiles) > 0 {
out := "_go_." + b.arch
gcargs := []string{"-p", a.p.ImportPath}
if a.p.Standard && a.p.ImportPath == "runtime" {
// runtime compiles with a special 6g flag to emit
// additional reflect type data.
gcargs = append(gcargs, "-+")
}
if err := b.gc(a.p, obj+out, gcargs, inc, gofiles); err != nil {
if out, err := buildToolchain.gc(b, a.p, obj, inc, gofiles); err != nil {
return err
} else {
objects = append(objects, out)
}
objects = append(objects, out)
}
// Copy .h files named for goos or goarch or goos_goarch
@ -598,7 +592,7 @@ func (b *builder) build(a *action) error {
for _, file := range cfiles {
out := file[:len(file)-len(".c")] + "." + b.arch
if err := b.cc(a.p, obj, obj+out, file); err != nil {
if err := buildToolchain.cc(b, a.p, obj, obj+out, file); err != nil {
return err
}
objects = append(objects, out)
@ -607,7 +601,7 @@ func (b *builder) build(a *action) error {
// Assemble .s files.
for _, file := range sfiles {
out := file[:len(file)-len(".s")] + "." + b.arch
if err := b.asm(a.p, obj, obj+out, file); err != nil {
if err := buildToolchain.asm(b, a.p, obj, obj+out, file); err != nil {
return err
}
objects = append(objects, out)
@ -620,7 +614,7 @@ func (b *builder) build(a *action) error {
objects = append(objects, cgoObjects...)
// Pack into archive in obj directory
if err := b.gopack(a.p, obj, a.objpkg, objects); err != nil {
if err := buildToolchain.pack(b, a.p, obj, a.objpkg, objects); err != nil {
return err
}
@ -630,8 +624,7 @@ func (b *builder) build(a *action) error {
// linker needs the whole dependency tree.
all := actionList(a)
all = all[:len(all)-1] // drop a
inc := b.includeArgs("-L", all)
if err := b.ld(a.p, a.target, inc, a.objpkg); err != nil {
if err := buildToolchain.ld(b, a.p, a.target, all, a.objpkg, objects); err != nil {
return err
}
}
@ -685,6 +678,9 @@ func (b *builder) includeArgs(flag string, all []*action) []string {
// Finally, look in the installed package directories for each action.
for _, a1 := range all {
if dir := a1.pkgdir; dir == a1.p.t.PkgDir() && !incMap[dir] {
if _, ok := buildToolchain.(gccgoToolchain); ok {
dir = filepath.Join(filepath.Dir(dir), "gccgo", filepath.Base(dir))
}
incMap[dir] = true
inc = append(inc, flag, dir)
}
@ -935,27 +931,68 @@ func mkAbs(dir, f string) string {
return filepath.Join(dir, f)
}
// gc runs the Go compiler in a specific directory on a set of files
// to generate the named output file.
func (b *builder) gc(p *Package, ofile string, gcargs, importArgs []string, gofiles []string) error {
type toolchain interface {
// gc runs the compiler in a specific directory on a set of files
// and returns the name of the generated output file.
gc(b *builder, p *Package, obj string, importArgs []string, gofiles []string) (ofile string, err error)
// cc runs the toolchain's C compiler in a directory on a C file
// to produce an output file.
cc(b *builder, p *Package, objdir, ofile, cfile string) error
// asm runs the assembler in a specific directory on a specific file
// to generate the named output file.
asm(b *builder, p *Package, obj, ofile, sfile string) error
// pkgpath creates the appropriate destination path for a package file.
pkgpath(basedir string, p *Package) string
// pack runs the archive packer in a specific directory to create
// an archive from a set of object files.
// typically it is run in the object directory.
pack(b *builder, p *Package, objDir, afile string, ofiles []string) error
// ld runs the linker to create a package starting at mainpkg.
ld(b *builder, p *Package, out string, allactions []*action, mainpkg string, ofiles []string) error
}
type goToolchain struct{}
type gccgoToolchain struct{}
var buildToolchain toolchain
func init() {
if os.Getenv("GC") == "gccgo" {
buildToolchain = gccgoToolchain{}
} else {
buildToolchain = goToolchain{}
}
}
// The Go toolchain.
func (goToolchain) gc(b *builder, p *Package, obj string, importArgs []string, gofiles []string) (ofile string, err error) {
out := "_go_." + b.arch
ofile = obj + out
gcargs := []string{"-p", p.ImportPath}
if p.Standard && p.ImportPath == "runtime" {
// runtime compiles with a special 6g flag to emit
// additional reflect type data.
gcargs = append(gcargs, "-+")
}
args := stringList(b.arch+"g", "-o", ofile, b.gcflags, gcargs, importArgs)
for _, f := range gofiles {
args = append(args, mkAbs(p.Dir, f))
}
return b.run(p.Dir, p.ImportPath, args)
return ofile, b.run(p.Dir, p.ImportPath, args)
}
// asm runs the assembler in a specific directory on a specific file
// to generate the named output file.
func (b *builder) asm(p *Package, obj, ofile, sfile string) error {
func (goToolchain) asm(b *builder, p *Package, obj, ofile, sfile string) error {
sfile = mkAbs(p.Dir, sfile)
return b.run(p.Dir, p.ImportPath, b.arch+"a", "-I", obj, "-o", ofile, "-DGOOS_"+b.goos, "-DGOARCH_"+b.goarch, sfile)
}
// gopack runs the assembler in a specific directory to create
// an archive from a set of object files.
// typically it is run in the object directory.
func (b *builder) gopack(p *Package, objDir, afile string, ofiles []string) error {
func (goToolchain) pkgpath(basedir string, p *Package) string {
return filepath.Join(basedir, filepath.FromSlash(p.ImportPath+".a"))
}
func (goToolchain) pack(b *builder, p *Package, objDir, afile string, ofiles []string) error {
var absOfiles []string
for _, f := range ofiles {
absOfiles = append(absOfiles, mkAbs(objDir, f))
@ -963,14 +1000,12 @@ func (b *builder) gopack(p *Package, objDir, afile string, ofiles []string) erro
return b.run(p.Dir, p.ImportPath, "gopack", "grc", mkAbs(objDir, afile), absOfiles)
}
// ld runs the linker to create a package starting at mainpkg.
func (b *builder) ld(p *Package, out string, importArgs []string, mainpkg string) error {
func (goToolchain) ld(b *builder, p *Package, out string, allactions []*action, mainpkg string, ofiles []string) error {
importArgs := b.includeArgs("-L", allactions)
return b.run(p.Dir, p.ImportPath, b.arch+"l", "-o", out, importArgs, mainpkg)
}
// cc runs the gc-toolchain C compiler in a directory on a C file
// to produce an output file.
func (b *builder) cc(p *Package, objdir, ofile, cfile string) error {
func (goToolchain) cc(b *builder, p *Package, objdir, ofile, cfile string) error {
inc := filepath.Join(b.goroot, "pkg", fmt.Sprintf("%s_%s", b.goos, b.goarch))
cfile = mkAbs(p.Dir, cfile)
return b.run(p.Dir, p.ImportPath, b.arch+"c", "-FVw",
@ -978,6 +1013,71 @@ func (b *builder) cc(p *Package, objdir, ofile, cfile string) error {
"-DGOOS_"+b.goos, "-DGOARCH_"+b.goarch, cfile)
}
// The Gccgo toolchain.
func (gccgoToolchain) gc(b *builder, p *Package, obj string, importArgs []string, gofiles []string) (ofile string, err error) {
out := p.Name + ".o"
ofile = obj + out
gcargs := []string{"-g"}
if p.Name != "main" {
if p.fake {
gcargs = append(gcargs, "-fgo-prefix=fake_"+p.ImportPath)
} else {
gcargs = append(gcargs, "-fgo-prefix=go_"+p.ImportPath)
}
}
args := stringList("gccgo", importArgs, "-c", b.gcflags, gcargs, "-o", ofile)
for _, f := range gofiles {
args = append(args, mkAbs(p.Dir, f))
}
return ofile, b.run(p.Dir, p.ImportPath, args)
}
func (gccgoToolchain) asm(b *builder, p *Package, obj, ofile, sfile string) error {
sfile = mkAbs(p.Dir, sfile)
return b.run(p.Dir, p.ImportPath, "gccgo", "-I", obj, "-o", ofile, "-DGOOS_"+b.goos, "-DGOARCH_"+b.goarch, sfile)
}
func (gccgoToolchain) pkgpath(basedir string, p *Package) string {
afile := filepath.Join(basedir, filepath.FromSlash(p.ImportPath+".a"))
// prepend "lib" to the basename
return filepath.Join(filepath.Dir(afile), "lib"+filepath.Base(afile))
}
func (gccgoToolchain) pack(b *builder, p *Package, objDir, afile string, ofiles []string) error {
var absOfiles []string
for _, f := range ofiles {
absOfiles = append(absOfiles, mkAbs(objDir, f))
}
return b.run(p.Dir, p.ImportPath, "ar", "cru", mkAbs(objDir, afile), absOfiles)
}
func (tools gccgoToolchain) ld(b *builder, p *Package, out string, allactions []*action, mainpkg string, ofiles []string) error {
// gccgo needs explicit linking with all package dependencies,
// and all LDFLAGS from cgo dependencies
afiles := []string{}
ldflags := []string{}
seen := map[*Package]bool{}
for _, a := range allactions {
if a.p != nil && !seen[a.p] {
seen[a.p] = true
if !a.p.Standard {
afiles = append(afiles, a.target)
}
ldflags = append(ldflags, a.p.CgoLDFLAGS...)
}
}
return b.run(p.Dir, p.ImportPath, "gccgo", "-o", out, ofiles, "-Wl,-(", afiles, ldflags, "-Wl,-)")
}
func (gccgoToolchain) cc(b *builder, p *Package, objdir, ofile, cfile string) error {
inc := filepath.Join(b.goroot, "pkg", fmt.Sprintf("%s_%s", b.goos, b.goarch))
cfile = mkAbs(p.Dir, cfile)
return b.run(p.Dir, p.ImportPath, "gcc", "-Wall", "-g",
"-I", objdir, "-I", inc, "-o", ofile,
"-DGOOS_"+b.goos, "-DGOARCH_"+b.goarch, "-c", cfile)
}
// gcc runs the gcc C compiler to create an object from a single C file.
func (b *builder) gcc(p *Package, out string, flags []string, cfile string) error {
cfile = mkAbs(p.Dir, cfile)
@ -1056,19 +1156,24 @@ func (b *builder) cgo(p *Package, cgoExe, obj string, gccfiles []string) (outGo,
cfiles = append(cfiles, f+"cgo2.c")
}
defunC := obj + "_cgo_defun.c"
cgoflags := []string{}
// TODO: make cgo not depend on $GOARCH?
var runtimeFlag []string
if p.Standard && p.ImportPath == "runtime/cgo" {
runtimeFlag = []string{"-import_runtime_cgo=false"}
cgoflags = append(cgoflags, "-import_runtime_cgo=false")
}
if err := b.run(p.Dir, p.ImportPath, cgoExe, "-objdir", obj, runtimeFlag, "--", p.CgoFiles); err != nil {
if _, ok := buildToolchain.(gccgoToolchain); ok {
cgoflags = append(cgoflags, "-gccgo")
}
if err := b.run(p.Dir, p.ImportPath, cgoExe, "-objdir", obj, cgoflags, "--", p.CgoFiles); err != nil {
return nil, nil, err
}
outGo = append(outGo, gofiles...)
// cc _cgo_defun.c
defunObj := obj + "_cgo_defun." + b.arch
if err := b.cc(p, obj, defunObj, defunC); err != nil {
if err := buildToolchain.cc(b, p, obj, defunObj, defunC); err != nil {
return nil, nil, err
}
outObj = append(outObj, defunObj)
@ -1106,7 +1211,7 @@ func (b *builder) cgo(p *Package, cgoExe, obj string, gccfiles []string) (outGo,
// cc _cgo_import.ARCH
importObj := obj + "_cgo_import." + b.arch
if err := b.cc(p, obj, importObj, importC); err != nil {
if err := buildToolchain.cc(b, p, obj, importObj, importC); err != nil {
return nil, nil, err
}

10
src/cmd/go/pkg.go
View File

@ -270,6 +270,16 @@ func scanPackage(ctxt *build.Context, t *build.Tree, arg, importPath, dir string
p.target = filepath.Join(t.PkgDir(), filepath.FromSlash(importPath)+".a")
}
// For gccgo, rewrite p.target with the expected library name. We won't do
// that for the standard library for the moment.
if !p.Standard {
dir := t.PkgDir()
if _, ok := buildToolchain.(gccgoToolchain); ok {
dir = filepath.Join(filepath.Dir(dir), "gccgo", filepath.Base(dir))
}
p.target = buildToolchain.pkgpath(dir, p)
}
var built time.Time
if fi, err := os.Stat(p.target); err == nil {
built = fi.ModTime()

7
src/cmd/go/test.go
View File

@ -330,8 +330,7 @@ func (b *builder) test(p *Package) (buildAction, runAction, printAction *action,
// We write the external test package archive to
// $WORK/unicode/utf8/_test/unicode/utf8_test.a.
testDir := filepath.Join(b.work, filepath.FromSlash(p.ImportPath+"/_test"))
ptestObj := filepath.Join(testDir, filepath.FromSlash(p.ImportPath+".a"))
pxtestObj := filepath.Join(testDir, filepath.FromSlash(p.ImportPath+"_test.a"))
ptestObj := buildToolchain.pkgpath(testDir, p)
// Create the directory for the .a files.
ptestDir, _ := filepath.Split(ptestObj)
@ -380,8 +379,8 @@ func (b *builder) test(p *Package) (buildAction, runAction, printAction *action,
pxtest.imports = append(pxtest.imports, ptest)
a := b.action(modeBuild, modeBuild, pxtest)
a.objdir = testDir + string(filepath.Separator)
a.objpkg = pxtestObj
a.target = pxtestObj
a.objpkg = buildToolchain.pkgpath(testDir, pxtest)
a.target = a.objpkg
}
// Action for building test.out.