if err != nil {
			t.Fatal(err)
		}
	}
}

// generateUsageTestFiles create nFolders * nFiles files of size bytes each.
func generateUsageTestFiles(t *testing.T, base, bucket string, nFolders, nFiles, size int) {
	pl := make([]byte, size)
	for i := 0; i < nFolders; i++ {
		name := filepath.Join(base, bucket, fmt.Sprint(i), "0.txt")
		err := os.MkdirAll(filepath.Dir(name), os.ModePerm)
		if err != nil {

			f(cu, fi.File(i))
		}
		for i, ninl := 0, int(fi.NumInlTree()); i < ninl; i++ {
			call := fi.InlTree(i)
			f(cu, call.File)
		}
	}
}

// generateFilenameTabs creates LUTs needed for filename lookup. Returns a slice
// of the index at which each CU begins in runtime.cutab.
//
// Function objects keep track of the files they reference to print the stack.

	}
	return nil
}

func (tools gccgoToolchain) asm(b *Builder, a *Action, sfiles []string) ([]string, error) {
	p := a.Package
	var ofiles []string
	for _, sfile := range sfiles {
		base := filepath.Base(sfile)
		ofile := a.Objdir + base[:len(base)-len(".s")] + ".o"
		ofiles = append(ofiles, ofile)
		sfile, _ = fsys.OverlayPath(mkAbs(p.Dir, sfile))
		defs := []string{"-D", "GOOS_" + cfg.Goos, "-D", "GOARCH_" + cfg.Goarch}

}

func (gcToolchain) asm(b *Builder, a *Action, sfiles []string) ([]string, error) {
	p := a.Package
	args := asmArgs(a, p)

	var ofiles []string
	for _, sfile := range sfiles {
		overlayPath, _ := fsys.OverlayPath(mkAbs(p.Dir, sfile))
		ofile := a.Objdir + sfile[:len(sfile)-len(".s")] + ".o"
		ofiles = append(ofiles, ofile)
		args1 := append(args, "-o", ofile, overlayPath)

	}
	more = len(ci.frames) > 0
	if frame.funcInfo.valid() {
		// Compute file/line just before we need to return it,
		// as it can be expensive. This avoids computing file/line
		// for the Frame we find but don't return. See issue 32093.
		file, line := funcline1(frame.funcInfo, frame.PC, false)
		frame.File, frame.Line = file, int(line)
	}
	return
}

  public static boolean equal(File file1, File file2) throws IOException {
    checkNotNull(file1);
    checkNotNull(file2);
    if (file1 == file2 || file1.equals(file2)) {
      return true;
    }

    /*
     * Some operating systems may return zero as the length for files denoting system-dependent
     * entities such as devices or pipes, in which case we must fall back on comparing the bytes
     * directly.
     */

  public static boolean equal(File file1, File file2) throws IOException {
    checkNotNull(file1);
    checkNotNull(file2);
    if (file1 == file2 || file1.equals(file2)) {
      return true;
    }

    /*
     * Some operating systems may return zero as the length for files denoting system-dependent
     * entities such as devices or pipes, in which case we must fall back on comparing the bytes
     * directly.
     */

				return err
			}
		}
	}

	for _, file := range cfiles {
		out := file[:len(file)-len(".c")] + ".o"
		if err := BuildToolchain.cc(b, a, objdir+out, file); err != nil {
			return err
		}
		objects = append(objects, out)
	}

	// Assemble .s files.
	if len(sfiles) > 0 {
		ofiles, err := BuildToolchain.asm(b, a, sfiles)
		if err != nil {

    def "can filter the elements of a file collection using a closure hitting the filesystem"() {
        given:
        file("files/file0.txt") << ""
        file("files/dir1/file1.txt") << ""
        file("files/dir2/file2.txt") << ""

        and:
        buildFile """
            def files = files("files/file0.txt", "files/dir1", "files/dir2", "files/dir3").elements.map {
                it.findAll { file ->

			}

			pkg, err := context.Import(pkgName, "", 0)
			if err != nil {
				t.Fatal(err)
			}
			if len(pkg.SFiles) == 0 {
				continue
			}
			t.Errorf("package %s has purego assembly files on %s: %v", pkgName, GOARCH, pkg.SFiles)
		}
	}