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.

	}
	return buf[growStack(n-1)]
}

func issue7978go() {
	C.issue7978c((*C.uint32_t)(&issue7978sync))
	issue7978wait(7, 8)
}

func test7978(t *testing.T) {
	if runtime.Compiler == "gccgo" {
		t.Skip("gccgo can not do stack traces of C code")
	}
	debug.SetTraceback("2")
	issue7978sync = 0
	go issue7978go()
	// test in c code, before callback
	issue7978wait(0, 1)

		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

				cancel()
				<-c.Done()
			},
			limit:      8,
			gccgoLimit: 25,
		},
	} {
		limit := test.limit
		if runtime.Compiler == "gccgo" {
			// gccgo does not yet do escape analysis.
			// TODO(iant): Remove this when gccgo does do escape analysis.
			limit = test.gccgoLimit
		}
		numRuns := 100
		if testing.Short() {
			numRuns = 10
		}

		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.

	}
	return module.Version{}, false
}

func ModInfoProg(info string, isgccgo bool) []byte {
	// Inject an init function to set runtime.modinfo.
	// This is only used for gccgo - with gc we hand the info directly to the linker.
	// The init function has the drawback that packages may want to
	// look at the module info in their init functions (see issue 29628),
	// which won't work. See also issue 30344.

	}

	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

			test(tt.name, tt.in, tt.want)
		}
	})

	// The numbers below are only valid for 64-bit interface word sizes,
	// and gc. With 32-bit words there are more convT2E allocs, and
	// with gccgo, only pointers currently go in interface data.
	// So only care on amd64 gc for now.
	measureAllocs := false
	switch runtime.GOARCH {
	case "amd64", "arm64":
		measureAllocs = runtime.Compiler == "gc"
	}