GO111MODULE
		Controls whether the go command runs in module-aware mode or GOPATH mode.
		May be "off", "on", or "auto".
		See https://golang.org/ref/mod#mod-commands.
	GCCGO
		The gccgo command to run for 'go build -compiler=gccgo'.
	GOARCH
		The architecture, or processor, for which to compile code.
		Examples are amd64, 386, arm, ppc64.
	GOBIN
		The directory where 'go install' will install a command.
	GOCACHE

		env = os.Getenv("GOROOT")
	}
	if env != "" {
		return filepath.Clean(env)
	}
	def := ""
	if r := runtime.GOROOT(); r != "" {
		def = filepath.Clean(r)
	}
	if runtime.Compiler == "gccgo" {
		// gccgo has no real GOROOT, and it certainly doesn't
		// depend on the executable's location.
		return def
	}

	// canonical returns a directory path that represents
	// the same directory as dir,

	if err == nil {
		return mi.Package(relPath(pkgdir, modroot)), nil
	}
	if !errors.Is(err, errNotFromModuleCache) {
		return nil, err
	}
	if cfg.BuildContext.Compiler == "gccgo" && str.HasPathPrefix(modroot, cfg.GOROOTsrc) {
		return nil, err // gccgo has no sources for GOROOT packages.
	}
	return openIndexPackage(modroot, pkgdir)
}

// GetModule returns the Module for the given modroot.

		generated output.
	-gccgo
		Generate output for the gccgo compiler rather than the
		gc compiler.
	-gccgoprefix prefix
		The -fgo-prefix option to be used with gccgo.
	-gccgopkgpath path
		The -fgo-pkgpath option to be used with gccgo.
	-gccgo_define_cgoincomplete
		Define cgo.Incomplete locally rather than importing it from
		the "runtime/cgo" package. Used for old gccgo versions.
	-godefs

		case "GODEBUG":
			env[i].Changed = env[i].Value != ""
		}
	}

	if work.GccgoBin != "" {
		env = append(env, cfg.EnvVar{Name: "GCCGO", Value: work.GccgoBin, Changed: true})
	} else {
		env = append(env, cfg.EnvVar{Name: "GCCGO", Value: work.GccgoName})
	}

	goarch, val, changed := cfg.GetArchEnv()
	if goarch != "" {
		env = append(env, cfg.EnvVar{Name: goarch, Value: val, Changed: changed})

func (sh *Shell) runOut(dir string, env []string, cmdargs ...any) ([]byte, error) {
	a := sh.action

	cmdline := str.StringList(cmdargs...)

	for _, arg := range cmdline {
		// GNU binutils commands, including gcc and gccgo, interpret an argument
		// @foo anywhere in the command line (even following --) as meaning
		// "read and insert arguments from the file named foo."
		// Don't say anything that might be misinterpreted that way.

	}

	b.id.Lock()
	b.toolIDCache[name] = id
	b.id.Unlock()

	return id
}

// gccToolID returns the unique ID to use for a tool that is invoked
// by the GCC driver. This is used particularly for gccgo, but this can also
// be used for gcc, g++, gfortran, etc.; those tools all use the GCC
// driver under different names. The approach used here should also
// work for sufficiently new versions of clang. Unlike toolID, the

	}
}

// issue 8331 part 1

func issue8331a() C.issue8331 {
	return issue8331Var
}

// issue 10303

func test10303(t *testing.T, n int) {
	if runtime.Compiler == "gccgo" {
		t.Skip("gccgo permits C pointers on the stack")
	}

	// Run at a few different stack depths just to avoid an unlucky pass
	// due to variables ending up on different pages.
	if n > 0 {
		test10303(t, n-1)

					panic("last non-emptyRest entry is emptyOne")
				}
				k++
			}
		}
	}
}

func RunGetgThreadSwitchTest() {
	// Test that getg works correctly with thread switch.
	// With gccgo, if we generate getg inlined, the backend
	// may cache the address of the TLS variable, which
	// will become invalid after a thread switch. This test
	// checks that the bad caching doesn't happen.

var laxGoVersionRE = lazyregexp.New(`^v?(([1-9][0-9]*)\.(0|[1-9][0-9]*))([^0-9].*)$`)

// Toolchains must be named beginning with `go1`,
// like "go1.20.3" or "go1.20.3-gccgo". As a special case, "default" is also permitted.
// Note that this regexp is a much looser condition than go/version.IsValid,
// for forward compatibility.