go gc 源码
golang gc 代码
文件路径：/src/cmd/go/internal/work/gc.go
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package work
import (
"bufio"
"bytes"
"fmt"
"io"
"log"
"os"
"path/filepath"
"runtime"
"strings"
"cmd/go/internal/base"
"cmd/go/internal/cfg"
"cmd/go/internal/fsys"
"cmd/go/internal/load"
"cmd/go/internal/str"
"cmd/internal/objabi"
"cmd/internal/quoted"
"cmd/internal/sys"
"crypto/sha1"
)
// The 'path' used for GOROOT_FINAL when -trimpath is specified
const trimPathGoRootFinal string = "$GOROOT"
var runtimePackages = map[string]struct{}{
"internal/abi": struct{}{},
"internal/bytealg": struct{}{},
"internal/cpu": struct{}{},
"internal/goarch": struct{}{},
"internal/goos": struct{}{},
"runtime": struct{}{},
"runtime/internal/atomic": struct{}{},
"runtime/internal/math": struct{}{},
"runtime/internal/sys": struct{}{},
"runtime/internal/syscall": struct{}{},
}
// The Go toolchain.
type gcToolchain struct{}
func (gcToolchain) compiler() string {
return base.Tool("compile")
}
func (gcToolchain) linker() string {
return base.Tool("link")
}
func pkgPath(a *Action) string {
p := a.Package
ppath := p.ImportPath
if cfg.BuildBuildmode == "plugin" {
ppath = pluginPath(a)
} else if p.Name == "main" && !p.Internal.ForceLibrary {
ppath = "main"
}
return ppath
}
func (gcToolchain) gc(b *Builder, a *Action, archive string, importcfg, embedcfg []byte, symabis string, asmhdr bool, gofiles []string) (ofile string, output []byte, err error) {
p := a.Package
objdir := a.Objdir
if archive != "" {
ofile = archive
} else {
out := "_go_.o"
ofile = objdir + out
}
pkgpath := pkgPath(a)
defaultGcFlags := []string{"-p", pkgpath}
if p.Module != nil {
v := p.Module.GoVersion
if v == "" {
// We started adding a 'go' directive to the go.mod file unconditionally
// as of Go 1.12, so any module that still lacks such a directive must
// either have been authored before then, or have a hand-edited go.mod
// file that hasn't been updated by cmd/go since that edit.
//
// Unfortunately, through at least Go 1.16 we didn't add versions to
// vendor/modules.txt. So this could also be a vendored 1.16 dependency.
//
// Fortunately, there were no breaking changes to the language between Go
// 1.11 and 1.16, so if we assume Go 1.16 semantics we will not introduce
// any spurious errors — we will only mask errors, and not particularly
// important ones at that.
v = "1.16"
}
if allowedVersion(v) {
defaultGcFlags = append(defaultGcFlags, "-lang=go"+v)
}
}
if p.Standard {
defaultGcFlags = append(defaultGcFlags, "-std")
}
_, compilingRuntime := runtimePackages[p.ImportPath]
compilingRuntime = compilingRuntime && p.Standard
if compilingRuntime {
// runtime compiles with a special gc flag to check for
// memory allocations that are invalid in the runtime package,
// and to implement some special compiler pragmas.
defaultGcFlags = append(defaultGcFlags, "-+")
}
// If we're giving the compiler the entire package (no C etc files), tell it that,
// so that it can give good error messages about forward declarations.
// Exceptions: a few standard packages have forward declarations for
// pieces supplied behind-the-scenes by package runtime.
extFiles := len(p.CgoFiles) + len(p.CFiles) + len(p.CXXFiles) + len(p.MFiles) + len(p.FFiles) + len(p.SFiles) + len(p.SysoFiles) + len(p.SwigFiles) + len(p.SwigCXXFiles)
if p.Standard {
switch p.ImportPath {
case "bytes", "internal/poll", "net", "os":
fallthrough
case "runtime/metrics", "runtime/pprof", "runtime/trace":
fallthrough
case "sync", "syscall", "time":
extFiles++
}
}
if extFiles == 0 {
defaultGcFlags = append(defaultGcFlags, "-complete")
}
if cfg.BuildContext.InstallSuffix != "" {
defaultGcFlags = append(defaultGcFlags, "-installsuffix", cfg.BuildContext.InstallSuffix)
}
if a.buildID != "" {
defaultGcFlags = append(defaultGcFlags, "-buildid", a.buildID)
}
if p.Internal.OmitDebug || cfg.Goos == "plan9" || cfg.Goarch == "wasm" {
defaultGcFlags = append(defaultGcFlags, "-dwarf=false")
}
if strings.HasPrefix(RuntimeVersion, "go1") && !strings.Contains(os.Args[0], "go_bootstrap") {
defaultGcFlags = append(defaultGcFlags, "-goversion", RuntimeVersion)
}
if symabis != "" {
defaultGcFlags = append(defaultGcFlags, "-symabis", symabis)
}
gcflags := str.StringList(forcedGcflags, p.Internal.Gcflags)
if p.Internal.FuzzInstrument {
gcflags = append(gcflags, fuzzInstrumentFlags()...)
}
if compilingRuntime {
// Remove -N, if present.
// It is not possible to build the runtime with no optimizations,
// because the compiler cannot eliminate enough write barriers.
for i := 0; i < len(gcflags); i++ {
if gcflags[i] == "-N" {
copy(gcflags[i:], gcflags[i+1:])
gcflags = gcflags[:len(gcflags)-1]
i--
}
}
}
// Add -c=N to use concurrent backend compilation, if possible.
if c := gcBackendConcurrency(gcflags); c > 1 {
gcflags = append(gcflags, fmt.Sprintf("-c=%d", c))
}
args := []any{cfg.BuildToolexec, base.Tool("compile"), "-o", ofile, "-trimpath", a.trimpath(), defaultGcFlags, gcflags}
if p.Internal.LocalPrefix == "" {
args = append(args, "-nolocalimports")
} else {
args = append(args, "-D", p.Internal.LocalPrefix)
}
if importcfg != nil {
if err := b.writeFile(objdir+"importcfg", importcfg); err != nil {
return "", nil, err
}
args = append(args, "-importcfg", objdir+"importcfg")
}
if embedcfg != nil {
if err := b.writeFile(objdir+"embedcfg", embedcfg); err != nil {
return "", nil, err
}
args = append(args, "-embedcfg", objdir+"embedcfg")
}
if ofile == archive {
args = append(args, "-pack")
}
if asmhdr {
args = append(args, "-asmhdr", objdir+"go_asm.h")
}
for _, f := range gofiles {
f := mkAbs(p.Dir, f)
// Handle overlays. Convert path names using OverlayPath
// so these paths can be handed directly to tools.
// Deleted files won't show up in when scanning directories earlier,
// so OverlayPath will never return "" (meaning a deleted file) here.
// TODO(#39958): Handle cases where the package directory
// doesn't exist on disk (this can happen when all the package's
// files are in an overlay): the code expects the package directory
// to exist and runs some tools in that directory.
// TODO(#39958): Process the overlays when the
// gofiles, cgofiles, cfiles, sfiles, and cxxfiles variables are
// created in (*Builder).build. Doing that requires rewriting the
// code that uses those values to expect absolute paths.
f, _ = fsys.OverlayPath(f)
args = append(args, f)
}
output, err = b.runOut(a, base.Cwd(), nil, args...)
return ofile, output, err
}
// gcBackendConcurrency returns the backend compiler concurrency level for a package compilation.
func gcBackendConcurrency(gcflags []string) int {
// First, check whether we can use -c at all for this compilation.
canDashC := concurrentGCBackendCompilationEnabledByDefault
switch e := os.Getenv("GO19CONCURRENTCOMPILATION"); e {
case "0":
canDashC = false
case "1":
canDashC = true
case "":
// Not set. Use default.
default:
log.Fatalf("GO19CONCURRENTCOMPILATION must be 0, 1, or unset, got %q", e)
}
CheckFlags:
for _, flag := range gcflags {
// Concurrent compilation is presumed incompatible with any gcflags,
// except for known commonly used flags.
// If the user knows better, they can manually add their own -c to the gcflags.
switch flag {
case "-N", "-l", "-S", "-B", "-C", "-I", "-shared":
// OK
default:
canDashC = false
break CheckFlags
}
}
// TODO: Test and delete these conditions.
if cfg.ExperimentErr != nil || cfg.Experiment.FieldTrack || cfg.Experiment.PreemptibleLoops {
canDashC = false
}
if !canDashC {
return 1
}
// Decide how many concurrent backend compilations to allow.
//
// If we allow too many, in theory we might end up with p concurrent processes,
// each with c concurrent backend compiles, all fighting over the same resources.
// However, in practice, that seems not to happen too much.
// Most build graphs are surprisingly serial, so p==1 for much of the build.
// Furthermore, concurrent backend compilation is only enabled for a part
// of the overall compiler execution, so c==1 for much of the build.
// So don't worry too much about that interaction for now.
//
// However, in practice, setting c above 4 tends not to help very much.
// See the analysis in CL 41192.
//
// TODO(josharian): attempt to detect whether this particular compilation
// is likely to be a bottleneck, e.g. when:
// - it has no successor packages to compile (usually package main)
// - all paths through the build graph pass through it
// - critical path scheduling says it is high priority
// and in such a case, set c to runtime.GOMAXPROCS(0).
// By default this is the same as runtime.NumCPU.
// We do this now when p==1.
// To limit parallelism, set GOMAXPROCS below numCPU; this may be useful
// on a low-memory builder, or if a deterministic build order is required.
c := runtime.GOMAXPROCS(0)
if cfg.BuildP == 1 {
// No process parallelism, do not cap compiler parallelism.
return c
}
// Some process parallelism. Set c to min(4, maxprocs).
if c > 4 {
c = 4
}
return c
}
// trimpath returns the -trimpath argument to use
// when compiling the action.
func (a *Action) trimpath() string {
// Keep in sync with Builder.ccompile
// The trimmed paths are a little different, but we need to trim in the
// same situations.
// Strip the object directory entirely.
objdir := a.Objdir
if len(objdir) > 1 && objdir[len(objdir)-1] == filepath.Separator {
objdir = objdir[:len(objdir)-1]
}
rewrite := ""
rewriteDir := a.Package.Dir
if cfg.BuildTrimpath {
importPath := a.Package.Internal.OrigImportPath
if m := a.Package.Module; m != nil && m.Version != "" {
rewriteDir = m.Path + "@" + m.Version + strings.TrimPrefix(importPath, m.Path)
} else {
rewriteDir = importPath
}
rewrite += a.Package.Dir + "=>" + rewriteDir + ";"
}
// Add rewrites for overlays. The 'from' and 'to' paths in overlays don't need to have
// same basename, so go from the overlay contents file path (passed to the compiler)
// to the path the disk path would be rewritten to.
cgoFiles := make(map[string]bool)
for _, f := range a.Package.CgoFiles {
cgoFiles[f] = true
}
// TODO(matloob): Higher up in the stack, when the logic for deciding when to make copies
// of c/c++/m/f/hfiles is consolidated, use the same logic that Build uses to determine
// whether to create the copies in objdir to decide whether to rewrite objdir to the
// package directory here.
var overlayNonGoRewrites string // rewrites for non-go files
hasCgoOverlay := false
if fsys.OverlayFile != "" {
for _, filename := range a.Package.AllFiles() {
path := filename
if !filepath.IsAbs(path) {
path = filepath.Join(a.Package.Dir, path)
}
base := filepath.Base(path)
isGo := strings.HasSuffix(filename, ".go") || strings.HasSuffix(filename, ".s")
isCgo := cgoFiles[filename] || !isGo
overlayPath, isOverlay := fsys.OverlayPath(path)
if isCgo && isOverlay {
hasCgoOverlay = true
}
if !isCgo && isOverlay {
rewrite += overlayPath + "=>" + filepath.Join(rewriteDir, base) + ";"
} else if isCgo {
// Generate rewrites for non-Go files copied to files in objdir.
if filepath.Dir(path) == a.Package.Dir {
// This is a file copied to objdir.
overlayNonGoRewrites += filepath.Join(objdir, base) + "=>" + filepath.Join(rewriteDir, base) + ";"
}
} else {
// Non-overlay Go files are covered by the a.Package.Dir rewrite rule above.
}
}
}
if hasCgoOverlay {
rewrite += overlayNonGoRewrites
}
rewrite += objdir + "=>"
return rewrite
}
func asmArgs(a *Action, p *load.Package) []any {
// Add -I pkg/GOOS_GOARCH so #include "textflag.h" works in .s files.
inc := filepath.Join(cfg.GOROOT, "pkg", "include")
pkgpath := pkgPath(a)
args := []any{cfg.BuildToolexec, base.Tool("asm"), "-p", pkgpath, "-trimpath", a.trimpath(), "-I", a.Objdir, "-I", inc, "-D", "GOOS_" + cfg.Goos, "-D", "GOARCH_" + cfg.Goarch, forcedAsmflags, p.Internal.Asmflags}
if p.ImportPath == "runtime" && cfg.Goarch == "386" {
for _, arg := range forcedAsmflags {
if arg == "-dynlink" {
args = append(args, "-D=GOBUILDMODE_shared=1")
}
}
}
if objabi.IsRuntimePackagePath(pkgpath) {
args = append(args, "-compiling-runtime")
}
if cfg.Goarch == "386" {
// Define GO386_value from cfg.GO386.
args = append(args, "-D", "GO386_"+cfg.GO386)
}
if cfg.Goarch == "amd64" {
// Define GOAMD64_value from cfg.GOAMD64.
args = append(args, "-D", "GOAMD64_"+cfg.GOAMD64)
}
if cfg.Goarch == "mips" || cfg.Goarch == "mipsle" {
// Define GOMIPS_value from cfg.GOMIPS.
args = append(args, "-D", "GOMIPS_"+cfg.GOMIPS)
}
if cfg.Goarch == "mips64" || cfg.Goarch == "mips64le" {
// Define GOMIPS64_value from cfg.GOMIPS64.
args = append(args, "-D", "GOMIPS64_"+cfg.GOMIPS64)
}
return args
}
func (gcToolchain) asm(b *Builder, a *Action, sfiles []string) ([]string, error) {
p := a.Package
args := asmArgs(a, p)
var ofiles []string
for _, sfile := range sfiles {
overlayPath, _ := fsys.OverlayPath(mkAbs(p.Dir, sfile))
ofile := a.Objdir + sfile[:len(sfile)-len(".s")] + ".o"
ofiles = append(ofiles, ofile)
args1 := append(args, "-o", ofile, overlayPath)
if err := b.run(a, p.Dir, p.ImportPath, nil, args1...); err != nil {
return nil, err
}
}
return ofiles, nil
}
func (gcToolchain) symabis(b *Builder, a *Action, sfiles []string) (string, error) {
mkSymabis := func(p *load.Package, sfiles []string, path string) error {
args := asmArgs(a, p)
args = append(args, "-gensymabis", "-o", path)
for _, sfile := range sfiles {
if p.ImportPath == "runtime/cgo" && strings.HasPrefix(sfile, "gcc_") {
continue
}
op, _ := fsys.OverlayPath(mkAbs(p.Dir, sfile))
args = append(args, op)
}
// Supply an empty go_asm.h as if the compiler had been run.
// -gensymabis parsing is lax enough that we don't need the
// actual definitions that would appear in go_asm.h.
if err := b.writeFile(a.Objdir+"go_asm.h", nil); err != nil {
return err
}
return b.run(a, p.Dir, p.ImportPath, nil, args...)
}
var symabis string // Only set if we actually create the file
p := a.Package
if len(sfiles) != 0 {
symabis = a.Objdir + "symabis"
if err := mkSymabis(p, sfiles, symabis); err != nil {
return "", err
}
}
return symabis, nil
}
// toolVerify checks that the command line args writes the same output file
// if run using newTool instead.
// Unused now but kept around for future use.
func toolVerify(a *Action, b *Builder, p *load.Package, newTool string, ofile string, args []any) error {
newArgs := make([]any, len(args))
copy(newArgs, args)
newArgs[1] = base.Tool(newTool)
newArgs[3] = ofile + ".new" // x.6 becomes x.6.new
if err := b.run(a, p.Dir, p.ImportPath, nil, newArgs...); err != nil {
return err
}
data1, err := os.ReadFile(ofile)
if err != nil {
return err
}
data2, err := os.ReadFile(ofile + ".new")
if err != nil {
return err
}
if !bytes.Equal(data1, data2) {
return fmt.Errorf("%s and %s produced different output files:\n%s\n%s", filepath.Base(args[1].(string)), newTool, strings.Join(str.StringList(args...), " "), strings.Join(str.StringList(newArgs...), " "))
}
os.Remove(ofile + ".new")
return nil
}
func (gcToolchain) pack(b *Builder, a *Action, afile string, ofiles []string) error {
var absOfiles []string
for _, f := range ofiles {
absOfiles = append(absOfiles, mkAbs(a.Objdir, f))
}
absAfile := mkAbs(a.Objdir, afile)
// The archive file should have been created by the compiler.
// Since it used to not work that way, verify.
if !cfg.BuildN {
if _, err := os.Stat(absAfile); err != nil {
base.Fatalf("os.Stat of archive file failed: %v", err)
}
}
p := a.Package
if cfg.BuildN || cfg.BuildX {
cmdline := str.StringList(base.Tool("pack"), "r", absAfile, absOfiles)
b.Showcmd(p.Dir, "%s # internal", joinUnambiguously(cmdline))
}
if cfg.BuildN {
return nil
}
if err := packInternal(absAfile, absOfiles); err != nil {
b.showOutput(a, p.Dir, p.Desc(), err.Error()+"\n")
return errPrintedOutput
}
return nil
}
func packInternal(afile string, ofiles []string) error {
dst, err := os.OpenFile(afile, os.O_WRONLY|os.O_APPEND, 0)
if err != nil {
return err
}
defer dst.Close() // only for error returns or panics
w := bufio.NewWriter(dst)
for _, ofile := range ofiles {
src, err := os.Open(ofile)
if err != nil {
return err
}
fi, err := src.Stat()
if err != nil {
src.Close()
return err
}
// Note: Not using %-16.16s format because we care
// about bytes, not runes.
name := fi.Name()
if len(name) > 16 {
name = name[:16]
} else {
name += strings.Repeat(" ", 16-len(name))
}
size := fi.Size()
fmt.Fprintf(w, "%s%-12d%-6d%-6d%-8o%-10d`\n",
name, 0, 0, 0, 0644, size)
n, err := io.Copy(w, src)
src.Close()
if err == nil && n < size {
err = io.ErrUnexpectedEOF
} else if err == nil && n > size {
err = fmt.Errorf("file larger than size reported by stat")
}
if err != nil {
return fmt.Errorf("copying %s to %s: %v", ofile, afile, err)
}
if size&1 != 0 {
w.WriteByte(0)
}
}
if err := w.Flush(); err != nil {
return err
}
return dst.Close()
}
// setextld sets the appropriate linker flags for the specified compiler.
func setextld(ldflags []string, compiler []string) ([]string, error) {
for _, f := range ldflags {
if f == "-extld" || strings.HasPrefix(f, "-extld=") {
// don't override -extld if supplied
return ldflags, nil
}
}
joined, err := quoted.Join(compiler)
if err != nil {
return nil, err
}
return append(ldflags, "-extld="+joined), nil
}
// pluginPath computes the package path for a plugin main package.
//
// This is typically the import path of the main package p, unless the
// plugin is being built directly from source files. In that case we
// combine the package build ID with the contents of the main package
// source files. This allows us to identify two different plugins
// built from two source files with the same name.
func pluginPath(a *Action) string {
p := a.Package
if p.ImportPath != "command-line-arguments" {
return p.ImportPath
}
h := sha1.New()
buildID := a.buildID
if a.Mode == "link" {
// For linking, use the main package's build ID instead of
// the binary's build ID, so it is the same hash used in
// compiling and linking.
// When compiling, we use actionID/actionID (instead of
// actionID/contentID) as a temporary build ID to compute
// the hash. Do the same here. (See buildid.go:useCache)
// The build ID matters because it affects the overall hash
// in the plugin's pseudo-import path returned below.
// We need to use the same import path when compiling and linking.
id := strings.Split(buildID, buildIDSeparator)
buildID = id[1] + buildIDSeparator + id[1]
}
fmt.Fprintf(h, "build ID: %s\n", buildID)
for _, file := range str.StringList(p.GoFiles, p.CgoFiles, p.SFiles) {
data, err := os.ReadFile(filepath.Join(p.Dir, file))
if err != nil {
base.Fatalf("go: %s", err)
}
h.Write(data)
}
return fmt.Sprintf("plugin/unnamed-%x", h.Sum(nil))
}
func (gcToolchain) ld(b *Builder, root *Action, out, importcfg, mainpkg string) error {
cxx := len(root.Package.CXXFiles) > 0 || len(root.Package.SwigCXXFiles) > 0
for _, a := range root.Deps {
if a.Package != nil && (len(a.Package.CXXFiles) > 0 || len(a.Package.SwigCXXFiles) > 0) {
cxx = true
}
}
var ldflags []string
if cfg.BuildContext.InstallSuffix != "" {
ldflags = append(ldflags, "-installsuffix", cfg.BuildContext.InstallSuffix)
}
if root.Package.Internal.OmitDebug {
ldflags = append(ldflags, "-s", "-w")
}
if cfg.BuildBuildmode == "plugin" {
ldflags = append(ldflags, "-pluginpath", pluginPath(root))
}
// Store BuildID inside toolchain binaries as a unique identifier of the
// tool being run, for use by content-based staleness determination.
if root.Package.Goroot && strings.HasPrefix(root.Package.ImportPath, "cmd/") {
// External linking will include our build id in the external
// linker's build id, which will cause our build id to not
// match the next time the tool is built.
// Rely on the external build id instead.
if !sys.MustLinkExternal(cfg.Goos, cfg.Goarch) {
ldflags = append(ldflags, "-X=cmd/internal/objabi.buildID="+root.buildID)
}
}
// If the user has not specified the -extld option, then specify the
// appropriate linker. In case of C++ code, use the compiler named
// by the CXX environment variable or defaultCXX if CXX is not set.
// Else, use the CC environment variable and defaultCC as fallback.
var compiler []string
if cxx {
compiler = envList("CXX", cfg.DefaultCXX(cfg.Goos, cfg.Goarch))
} else {
compiler = envList("CC", cfg.DefaultCC(cfg.Goos, cfg.Goarch))
}
ldflags = append(ldflags, "-buildmode="+ldBuildmode)
if root.buildID != "" {
ldflags = append(ldflags, "-buildid="+root.buildID)
}
ldflags = append(ldflags, forcedLdflags...)
ldflags = append(ldflags, root.Package.Internal.Ldflags...)
ldflags, err := setextld(ldflags, compiler)
if err != nil {
return err
}
// On OS X when using external linking to build a shared library,
// the argument passed here to -o ends up recorded in the final
// shared library in the LC_ID_DYLIB load command.
// To avoid putting the temporary output directory name there
// (and making the resulting shared library useless),
// run the link in the output directory so that -o can name
// just the final path element.
// On Windows, DLL file name is recorded in PE file
// export section, so do like on OS X.
dir := "."
if (cfg.Goos == "darwin" || cfg.Goos == "windows") && cfg.BuildBuildmode == "c-shared" {
dir, out = filepath.Split(out)
}
env := []string{}
if cfg.BuildTrimpath {
env = append(env, "GOROOT_FINAL="+trimPathGoRootFinal)
}
return b.run(root, dir, root.Package.ImportPath, env, cfg.BuildToolexec, base.Tool("link"), "-o", out, "-importcfg", importcfg, ldflags, mainpkg)
}
func (gcToolchain) ldShared(b *Builder, root *Action, toplevelactions []*Action, out, importcfg string, allactions []*Action) error {
ldflags := []string{"-installsuffix", cfg.BuildContext.InstallSuffix}
ldflags = append(ldflags, "-buildmode=shared")
ldflags = append(ldflags, forcedLdflags...)
ldflags = append(ldflags, root.Package.Internal.Ldflags...)
cxx := false
for _, a := range allactions {
if a.Package != nil && (len(a.Package.CXXFiles) > 0 || len(a.Package.SwigCXXFiles) > 0) {
cxx = true
}
}
// If the user has not specified the -extld option, then specify the
// appropriate linker. In case of C++ code, use the compiler named
// by the CXX environment variable or defaultCXX if CXX is not set.
// Else, use the CC environment variable and defaultCC as fallback.
var compiler []string
if cxx {
compiler = envList("CXX", cfg.DefaultCXX(cfg.Goos, cfg.Goarch))
} else {
compiler = envList("CC", cfg.DefaultCC(cfg.Goos, cfg.Goarch))
}
ldflags, err := setextld(ldflags, compiler)
if err != nil {
return err
}
for _, d := range toplevelactions {
if !strings.HasSuffix(d.Target, ".a") { // omit unsafe etc and actions for other shared libraries
continue
}
ldflags = append(ldflags, d.Package.ImportPath+"="+d.Target)
}
return b.run(root, ".", out, nil, cfg.BuildToolexec, base.Tool("link"), "-o", out, "-importcfg", importcfg, ldflags)
}
func (gcToolchain) cc(b *Builder, a *Action, ofile, cfile string) error {
return fmt.Errorf("%s: C source files not supported without cgo", mkAbs(a.Package.Dir, cfile))
}
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