Adding upstream version 1.20.14.upstream/1.20.14upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 442 insertions, 0 deletions

diff --git a/src/cmd/go/internal/work/init.go b/src/cmd/go/internal/work/init.go
new file mode 100644
index 0000000..cd99a33
--- /dev/null
+++ b/src/cmd/go/internal/work/init.go
@@ -0,0 +1,442 @@
+// 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 (
+	"bytes"
+	"cmd/go/internal/base"
+	"cmd/go/internal/cfg"
+	"cmd/go/internal/fsys"
+	"cmd/go/internal/modload"
+	"cmd/internal/quoted"
+	"fmt"
+	"internal/platform"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"runtime"
+	"strconv"
+	"sync"
+)
+
+var buildInitStarted = false
+
+func BuildInit() {
+	if buildInitStarted {
+		base.Fatalf("go: internal error: work.BuildInit called more than once")
+	}
+	buildInitStarted = true
+	base.AtExit(closeBuilders)
+
+	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: evaluating -pkgdir: %v\n", err)
+			base.SetExitStatus(2)
+			base.Exit()
+		}
+		cfg.BuildPkgdir = p
+	}
+
+	if cfg.BuildP <= 0 {
+		base.Fatalf("go: -p must be a positive integer: %v\n", cfg.BuildP)
+	}
+
+	// Make sure CC, CXX, and FC are absolute paths.
+	for _, key := range []string{"CC", "CXX", "FC"} {
+		value := cfg.Getenv(key)
+		args, err := quoted.Split(value)
+		if err != nil {
+			base.Fatalf("go: %s environment variable could not be parsed: %v", key, err)
+		}
+		if len(args) == 0 {
+			continue
+		}
+		path := args[0]
+		if !filepath.IsAbs(path) && path != filepath.Base(path) {
+			base.Fatalf("go: %s environment variable is relative; must be absolute path: %s\n", key, path)
+		}
+	}
+
+	// Set covermode if not already set.
+	// Ensure that -race and -covermode are compatible.
+	if cfg.BuildCoverMode == "" {
+		cfg.BuildCoverMode = "set"
+		if cfg.BuildRace {
+			// Default coverage mode is atomic when -race is set.
+			cfg.BuildCoverMode = "atomic"
+		}
+	}
+	if cfg.BuildRace && cfg.BuildCoverMode != "atomic" {
+		base.Fatalf(`-covermode must be "atomic", not %q, when -race is enabled`, cfg.BuildCoverMode)
+	}
+}
+
+// fuzzInstrumentFlags returns compiler flags that enable fuzzing instrumation
+// on supported platforms.
+//
+// On unsupported platforms, fuzzInstrumentFlags returns nil, meaning no
+// instrumentation is added. 'go test -fuzz' still works without coverage,
+// but it generates random inputs without guidance, so it's much less effective.
+func fuzzInstrumentFlags() []string {
+	if !platform.FuzzInstrumented(cfg.Goos, cfg.Goarch) {
+		return nil
+	}
+	return []string{"-d=libfuzzer"}
+}
+
+func instrumentInit() {
+	if !cfg.BuildRace && !cfg.BuildMSan && !cfg.BuildASan {
+		return
+	}
+	if cfg.BuildRace && cfg.BuildMSan {
+		fmt.Fprintf(os.Stderr, "go: may not use -race and -msan simultaneously\n")
+		base.SetExitStatus(2)
+		base.Exit()
+	}
+	if cfg.BuildRace && cfg.BuildASan {
+		fmt.Fprintf(os.Stderr, "go: may not use -race and -asan simultaneously\n")
+		base.SetExitStatus(2)
+		base.Exit()
+	}
+	if cfg.BuildMSan && cfg.BuildASan {
+		fmt.Fprintf(os.Stderr, "go: may not use -msan and -asan simultaneously\n")
+		base.SetExitStatus(2)
+		base.Exit()
+	}
+	if cfg.BuildMSan && !platform.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 && !platform.RaceDetectorSupported(cfg.Goos, cfg.Goarch) {
+		fmt.Fprintf(os.Stderr, "-race is not supported on %s/%s\n", cfg.Goos, cfg.Goarch)
+		base.SetExitStatus(2)
+		base.Exit()
+	}
+	if cfg.BuildASan && !platform.ASanSupported(cfg.Goos, cfg.Goarch) {
+		fmt.Fprintf(os.Stderr, "-asan is not supported on %s/%s\n", cfg.Goos, cfg.Goarch)
+		base.SetExitStatus(2)
+		base.Exit()
+	}
+	// The current implementation is only compatible with the ASan library from version
+	// v7 to v9 (See the description in src/runtime/asan/asan.go). Therefore, using the
+	// -asan option must use a compatible version of ASan library, which requires that
+	// the gcc version is not less than 7 and the clang version is not less than 9,
+	// otherwise a segmentation fault will occur.
+	if cfg.BuildASan {
+		if err := compilerRequiredAsanVersion(); err != nil {
+			fmt.Fprintf(os.Stderr, "%v\n", err)
+			base.SetExitStatus(2)
+			base.Exit()
+		}
+	}
+
+	mode := "race"
+	if cfg.BuildMSan {
+		mode = "msan"
+		// MSAN needs PIE on all platforms except linux/amd64.
+		// https://github.com/llvm/llvm-project/blob/llvmorg-13.0.1/clang/lib/Driver/SanitizerArgs.cpp#L621
+		if cfg.BuildBuildmode == "default" && (cfg.Goos != "linux" || cfg.Goarch != "amd64") {
+			cfg.BuildBuildmode = "pie"
+		}
+	}
+	if cfg.BuildASan {
+		mode = "asan"
+	}
+	modeFlag := "-" + mode
+
+	// Check that cgo is enabled.
+	// Note: On macOS, -race does not require cgo. -asan and -msan still do.
+	if !cfg.BuildContext.CgoEnabled && (cfg.Goos != "darwin" || cfg.BuildASan || cfg.BuildMSan) {
+		if runtime.GOOS != cfg.Goos || runtime.GOARCH != cfg.Goarch {
+			fmt.Fprintf(os.Stderr, "go: %s requires cgo\n", modeFlag)
+		} else {
+			fmt.Fprintf(os.Stderr, "go: %s requires cgo; enable cgo by setting CGO_ENABLED=1\n", 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.ToolTags = append(cfg.BuildContext.ToolTags, 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":
+			if cfg.BuildRace {
+				ldBuildmode = "exe"
+			} else {
+				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 !platform.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 !platform.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")
+		}
+	}
+}
+
+type version struct {
+	name         string
+	major, minor int
+}
+
+var compiler struct {
+	sync.Once
+	version
+	err error
+}
+
+// compilerVersion detects the version of $(go env CC).
+// It returns a non-nil error if the compiler matches a known version schema but
+// the version could not be parsed, or if $(go env CC) could not be determined.
+func compilerVersion() (version, error) {
+	compiler.Once.Do(func() {
+		compiler.err = func() error {
+			compiler.name = "unknown"
+			cc := os.Getenv("CC")
+			out, err := exec.Command(cc, "--version").Output()
+			if err != nil {
+				// Compiler does not support "--version" flag: not Clang or GCC.
+				return err
+			}
+
+			var match [][]byte
+			if bytes.HasPrefix(out, []byte("gcc")) {
+				compiler.name = "gcc"
+				out, err := exec.Command(cc, "-v").CombinedOutput()
+				if err != nil {
+					// gcc, but does not support gcc's "-v" flag?!
+					return err
+				}
+				gccRE := regexp.MustCompile(`gcc version (\d+)\.(\d+)`)
+				match = gccRE.FindSubmatch(out)
+			} else {
+				clangRE := regexp.MustCompile(`clang version (\d+)\.(\d+)`)
+				if match = clangRE.FindSubmatch(out); len(match) > 0 {
+					compiler.name = "clang"
+				}
+			}
+
+			if len(match) < 3 {
+				return nil // "unknown"
+			}
+			if compiler.major, err = strconv.Atoi(string(match[1])); err != nil {
+				return err
+			}
+			if compiler.minor, err = strconv.Atoi(string(match[2])); err != nil {
+				return err
+			}
+			return nil
+		}()
+	})
+	return compiler.version, compiler.err
+}
+
+// compilerRequiredAsanVersion is a copy of the function defined in
+// misc/cgo/testsanitizers/cc_test.go
+// compilerRequiredAsanVersion reports whether the compiler is the version
+// required by Asan.
+func compilerRequiredAsanVersion() error {
+	compiler, err := compilerVersion()
+	if err != nil {
+		return fmt.Errorf("-asan: the version of $(go env CC) could not be parsed")
+	}
+
+	switch compiler.name {
+	case "gcc":
+		if runtime.GOARCH == "ppc64le" && compiler.major < 9 {
+			return fmt.Errorf("-asan is not supported with %s compiler %d.%d\n", compiler.name, compiler.major, compiler.minor)
+		}
+		if compiler.major < 7 {
+			return fmt.Errorf("-asan is not supported with %s compiler %d.%d\n", compiler.name, compiler.major, compiler.minor)
+		}
+	case "clang":
+		if compiler.major < 9 {
+			return fmt.Errorf("-asan is not supported with %s compiler %d.%d\n", compiler.name, compiler.major, compiler.minor)
+		}
+	default:
+		return fmt.Errorf("-asan: C compiler is not gcc or clang")
+	}
+	return nil
+}