blob: eb9981533875706c9b059ad035603747b12239ca [file] [log] [blame]
// 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/load"
"flag"
"fmt"
"os"
"path/filepath"
"strings"
)
func BuildInit() {
load.ModInit()
instrumentInit()
buildModeInit()
// 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)
os.Exit(2)
}
cfg.BuildPkgdir = p
}
}
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])
os.Exit(2)
}
if cfg.BuildMSan && (cfg.Goos != "linux" || cfg.Goarch != "amd64" && cfg.Goarch != "arm64") {
fmt.Fprintf(os.Stderr, "-msan is not supported on %s/%s\n", cfg.Goos, cfg.Goarch)
os.Exit(2)
}
if cfg.BuildRace {
platform := cfg.Goos + "/" + cfg.Goarch
switch platform {
default:
fmt.Fprintf(os.Stderr, "go %s: -race is only supported on linux/amd64, linux/ppc64le, freebsd/amd64, netbsd/amd64, darwin/amd64 and windows/amd64\n", flag.Args()[0])
os.Exit(2)
case "linux/amd64", "linux/ppc64le", "freebsd/amd64", "netbsd/amd64", "darwin/amd64", "windows/amd64":
// race supported on these platforms
}
}
mode := "race"
if cfg.BuildMSan {
mode = "msan"
}
modeFlag := "-" + mode
if !cfg.BuildContext.CgoEnabled {
fmt.Fprintf(os.Stderr, "go %s: %s requires cgo; enable cgo by setting CGO_ENABLED=1\n", flag.Args()[0], modeFlag)
os.Exit(2)
}
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
platform := cfg.Goos + "/" + cfg.Goarch
switch cfg.BuildBuildmode {
case "archive":
pkgsFilter = pkgsNotMain
case "c-archive":
pkgsFilter = oneMainPkg
switch platform {
case "darwin/arm", "darwin/arm64":
codegenArg = "-shared"
default:
switch cfg.Goos {
case "dragonfly", "freebsd", "linux", "netbsd", "openbsd", "solaris":
if platform == "linux/ppc64" {
base.Fatalf("-buildmode=c-archive not supported on %s\n", platform)
}
// 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 platform {
case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/ppc64le", "linux/s390x",
"android/amd64", "android/arm", "android/arm64", "android/386",
"freebsd/amd64":
codegenArg = "-shared"
case "darwin/amd64", "darwin/386":
case "windows/amd64", "windows/386":
// Do not add usual .exe suffix to the .dll file.
cfg.ExeSuffix = ""
default:
base.Fatalf("-buildmode=c-shared not supported on %s\n", platform)
}
}
ldBuildmode = "c-shared"
case "default":
switch platform {
case "android/arm", "android/arm64", "android/amd64", "android/386":
codegenArg = "-shared"
ldBuildmode = "pie"
case "darwin/arm", "darwin/arm64":
codegenArg = "-shared"
fallthrough
default:
ldBuildmode = "exe"
}
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 {
base.Fatalf("-buildmode=pie not supported by gccgo")
} else {
switch platform {
case "linux/386", "linux/amd64", "linux/arm", "linux/arm64", "linux/ppc64le", "linux/s390x",
"android/amd64", "android/arm", "android/arm64", "android/386",
"freebsd/amd64":
codegenArg = "-shared"
case "darwin/amd64":
codegenArg = "-shared"
default:
base.Fatalf("-buildmode=pie not supported on %s\n", platform)
}
}
ldBuildmode = "pie"
case "shared":
pkgsFilter = pkgsNotMain
if gccgo {
codegenArg = "-fPIC"
} else {
switch platform {
case "linux/386", "linux/amd64", "linux/arm", "linux/arm64", "linux/ppc64le", "linux/s390x":
default:
base.Fatalf("-buildmode=shared not supported on %s\n", platform)
}
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 {
switch platform {
case "linux/amd64", "linux/arm", "linux/arm64", "linux/386", "linux/s390x", "linux/ppc64le",
"android/amd64", "android/arm", "android/arm64", "android/386":
case "darwin/amd64":
// Skip DWARF generation due to #21647
forcedLdflags = append(forcedLdflags, "-w")
default:
base.Fatalf("-buildmode=plugin not supported on %s\n", platform)
}
codegenArg = "-dynlink"
}
cfg.ExeSuffix = ".so"
ldBuildmode = "plugin"
default:
base.Fatalf("buildmode=%s not supported", cfg.BuildBuildmode)
}
if cfg.BuildLinkshared {
if gccgo {
codegenArg = "-fPIC"
} else {
switch platform {
case "linux/386", "linux/amd64", "linux/arm", "linux/arm64", "linux/ppc64le", "linux/s390x":
forcedAsmflags = append(forcedAsmflags, "-D=GOBUILDMODE_shared=1")
default:
base.Fatalf("-linkshared not supported on %s\n", platform)
}
codegenArg = "-dynlink"
// 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 "":
// ok
case "readonly", "vendor":
if load.ModLookup == nil && !inGOFLAGS("-mod") {
base.Fatalf("build flag -mod=%s only valid when using modules", cfg.BuildMod)
}
default:
base.Fatalf("-mod=%s not supported (can be '', 'readonly', or 'vendor')", cfg.BuildMod)
}
}
func inGOFLAGS(flag string) bool {
for _, goflag := range base.GOFLAGS() {
name := goflag
if strings.HasPrefix(name, "--") {
name = name[1:]
}
if i := strings.Index(name, "="); i >= 0 {
name = name[:i]
}
if name == flag {
return true
}
}
return false
}