Current File : //usr/local/go/src/cmd/go/internal/work/init.go
// Copyright 2017 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.
// Build initialization (after flag parsing).
package work
import (
"cmd/go/internal/base"
"cmd/go/internal/cfg"
"cmd/go/internal/fsys"
"cmd/go/internal/modload"
"cmd/internal/sys"
"flag"
"fmt"
"os"
"path/filepath"
"runtime"
)
func BuildInit() {
modload.Init()
instrumentInit()
buildModeInit()
if err := fsys.Init(base.Cwd()); err != nil {
base.Fatalf("go: %v", err)
}
// Make sure -pkgdir is absolute, because we run commands
// in different directories.
if cfg.BuildPkgdir != "" && !filepath.IsAbs(cfg.BuildPkgdir) {
p, err := filepath.Abs(cfg.BuildPkgdir)
if err != nil {
fmt.Fprintf(os.Stderr, "go %s: evaluating -pkgdir: %v\n", flag.Args()[0], err)
base.SetExitStatus(2)
base.Exit()
}
cfg.BuildPkgdir = p
}
// Make sure CC and CXX are absolute paths
for _, key := range []string{"CC", "CXX"} {
if path := cfg.Getenv(key); !filepath.IsAbs(path) && path != "" && path != filepath.Base(path) {
base.Fatalf("go %s: %s environment variable is relative; must be absolute path: %s\n", flag.Args()[0], key, path)
}
}
}
func instrumentInit() {
if !cfg.BuildRace && !cfg.BuildMSan {
return
}
if cfg.BuildRace && cfg.BuildMSan {
fmt.Fprintf(os.Stderr, "go %s: may not use -race and -msan simultaneously\n", flag.Args()[0])
base.SetExitStatus(2)
base.Exit()
}
if cfg.BuildMSan && !sys.MSanSupported(cfg.Goos, cfg.Goarch) {
fmt.Fprintf(os.Stderr, "-msan is not supported on %s/%s\n", cfg.Goos, cfg.Goarch)
base.SetExitStatus(2)
base.Exit()
}
if cfg.BuildRace {
if !sys.RaceDetectorSupported(cfg.Goos, cfg.Goarch) {
fmt.Fprintf(os.Stderr, "go %s: -race is only supported on linux/amd64, linux/ppc64le, linux/arm64, freebsd/amd64, netbsd/amd64, darwin/amd64, darwin/arm64, and windows/amd64\n", flag.Args()[0])
base.SetExitStatus(2)
base.Exit()
}
}
mode := "race"
if cfg.BuildMSan {
mode = "msan"
// MSAN does not support non-PIE binaries on ARM64.
// See issue #33712 for details.
if cfg.Goos == "linux" && cfg.Goarch == "arm64" && cfg.BuildBuildmode == "default" {
cfg.BuildBuildmode = "pie"
}
}
modeFlag := "-" + mode
if !cfg.BuildContext.CgoEnabled {
if runtime.GOOS != cfg.Goos || runtime.GOARCH != cfg.Goarch {
fmt.Fprintf(os.Stderr, "go %s: %s requires cgo\n", flag.Args()[0], modeFlag)
} else {
fmt.Fprintf(os.Stderr, "go %s: %s requires cgo; enable cgo by setting CGO_ENABLED=1\n", flag.Args()[0], modeFlag)
}
base.SetExitStatus(2)
base.Exit()
}
forcedGcflags = append(forcedGcflags, modeFlag)
forcedLdflags = append(forcedLdflags, modeFlag)
if cfg.BuildContext.InstallSuffix != "" {
cfg.BuildContext.InstallSuffix += "_"
}
cfg.BuildContext.InstallSuffix += mode
cfg.BuildContext.BuildTags = append(cfg.BuildContext.BuildTags, mode)
}
func buildModeInit() {
gccgo := cfg.BuildToolchainName == "gccgo"
var codegenArg string
// Configure the build mode first, then verify that it is supported.
// That way, if the flag is completely bogus we will prefer to error out with
// "-buildmode=%s not supported" instead of naming the specific platform.
switch cfg.BuildBuildmode {
case "archive":
pkgsFilter = pkgsNotMain
case "c-archive":
pkgsFilter = oneMainPkg
if gccgo {
codegenArg = "-fPIC"
} else {
switch cfg.Goos {
case "darwin", "ios":
switch cfg.Goarch {
case "arm64":
codegenArg = "-shared"
}
case "dragonfly", "freebsd", "illumos", "linux", "netbsd", "openbsd", "solaris":
// Use -shared so that the result is
// suitable for inclusion in a PIE or
// shared library.
codegenArg = "-shared"
}
}
cfg.ExeSuffix = ".a"
ldBuildmode = "c-archive"
case "c-shared":
pkgsFilter = oneMainPkg
if gccgo {
codegenArg = "-fPIC"
} else {
switch cfg.Goos {
case "linux", "android", "freebsd":
codegenArg = "-shared"
case "windows":
// Do not add usual .exe suffix to the .dll file.
cfg.ExeSuffix = ""
}
}
ldBuildmode = "c-shared"
case "default":
switch cfg.Goos {
case "android":
codegenArg = "-shared"
ldBuildmode = "pie"
case "windows":
ldBuildmode = "pie"
case "ios":
codegenArg = "-shared"
ldBuildmode = "pie"
case "darwin":
switch cfg.Goarch {
case "arm64":
codegenArg = "-shared"
}
fallthrough
default:
ldBuildmode = "exe"
}
if gccgo {
codegenArg = ""
}
case "exe":
pkgsFilter = pkgsMain
ldBuildmode = "exe"
// Set the pkgsFilter to oneMainPkg if the user passed a specific binary output
// and is using buildmode=exe for a better error message.
// See issue #20017.
if cfg.BuildO != "" {
pkgsFilter = oneMainPkg
}
case "pie":
if cfg.BuildRace {
base.Fatalf("-buildmode=pie not supported when -race is enabled")
}
if gccgo {
codegenArg = "-fPIE"
} else {
switch cfg.Goos {
case "aix", "windows":
default:
codegenArg = "-shared"
}
}
ldBuildmode = "pie"
case "shared":
pkgsFilter = pkgsNotMain
if gccgo {
codegenArg = "-fPIC"
} else {
codegenArg = "-dynlink"
}
if cfg.BuildO != "" {
base.Fatalf("-buildmode=shared and -o not supported together")
}
ldBuildmode = "shared"
case "plugin":
pkgsFilter = oneMainPkg
if gccgo {
codegenArg = "-fPIC"
} else {
codegenArg = "-dynlink"
}
cfg.ExeSuffix = ".so"
ldBuildmode = "plugin"
default:
base.Fatalf("buildmode=%s not supported", cfg.BuildBuildmode)
}
if !sys.BuildModeSupported(cfg.BuildToolchainName, cfg.BuildBuildmode, cfg.Goos, cfg.Goarch) {
base.Fatalf("-buildmode=%s not supported on %s/%s\n", cfg.BuildBuildmode, cfg.Goos, cfg.Goarch)
}
if cfg.BuildLinkshared {
if !sys.BuildModeSupported(cfg.BuildToolchainName, "shared", cfg.Goos, cfg.Goarch) {
base.Fatalf("-linkshared not supported on %s/%s\n", cfg.Goos, cfg.Goarch)
}
if gccgo {
codegenArg = "-fPIC"
} else {
forcedAsmflags = append(forcedAsmflags, "-D=GOBUILDMODE_shared=1",
"-linkshared")
codegenArg = "-dynlink"
forcedGcflags = append(forcedGcflags, "-linkshared")
// TODO(mwhudson): remove -w when that gets fixed in linker.
forcedLdflags = append(forcedLdflags, "-linkshared", "-w")
}
}
if codegenArg != "" {
if gccgo {
forcedGccgoflags = append([]string{codegenArg}, forcedGccgoflags...)
} else {
forcedAsmflags = append([]string{codegenArg}, forcedAsmflags...)
forcedGcflags = append([]string{codegenArg}, forcedGcflags...)
}
// Don't alter InstallSuffix when modifying default codegen args.
if cfg.BuildBuildmode != "default" || cfg.BuildLinkshared {
if cfg.BuildContext.InstallSuffix != "" {
cfg.BuildContext.InstallSuffix += "_"
}
cfg.BuildContext.InstallSuffix += codegenArg[1:]
}
}
switch cfg.BuildMod {
case "":
// Behavior will be determined automatically, as if no flag were passed.
case "readonly", "vendor", "mod":
if !cfg.ModulesEnabled && !base.InGOFLAGS("-mod") {
base.Fatalf("build flag -mod=%s only valid when using modules", cfg.BuildMod)
}
default:
base.Fatalf("-mod=%s not supported (can be '', 'mod', 'readonly', or 'vendor')", cfg.BuildMod)
}
if !cfg.ModulesEnabled {
if cfg.ModCacheRW && !base.InGOFLAGS("-modcacherw") {
base.Fatalf("build flag -modcacherw only valid when using modules")
}
if cfg.ModFile != "" && !base.InGOFLAGS("-mod") {
base.Fatalf("build flag -modfile only valid when using modules")
}
}
}
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