libgo: update to Go1.12beta2

    
    Reviewed-on: https://go-review.googlesource.com/c/158019

gotools/:
	* Makefile.am (go_cmd_vet_files): Update for Go1.12beta2 release.
	(GOTOOLS_TEST_TIMEOUT): Increase to 600.
	(check-runtime): Export LD_LIBRARY_PATH before computing GOARCH
	and GOOS.
	(check-vet): Copy golang.org/x/tools into check-vet-dir.
	* Makefile.in: Regenerate.

gcc/testsuite/:
	* go.go-torture/execute/names-1.go: Stop using debug/xcoff, which
	is no longer externally visible.

From-SVN: r268084

1 files changed, 27 insertions, 1 deletions

diff --git a/libgo/go/os/path_unix.go b/libgo/go/os/path_unix.go
index 3cb0e3a..be373a5 100644
--- a/libgo/go/os/path_unix.go
+++ b/libgo/go/os/path_unix.go
@@ -16,7 +16,7 @@ func IsPathSeparator(c uint8) bool {
 	return PathSeparator == c
 }
 
-// basename removes trailing slashes and the leading directory name from path name
+// basename removes trailing slashes and the leading directory name from path name.
 func basename(name string) string {
 	i := len(name) - 1
 	// Remove trailing slashes
@@ -34,6 +34,32 @@ func basename(name string) string {
 	return name
 }
 
+// splitPath returns the base name and parent directory.
+func splitPath(path string) (string, string) {
+	// if no better parent is found, the path is relative from "here"
+	dirname := "."
+	// if no slashes in path, base is path
+	basename := path
+
+	i := len(path) - 1
+
+	// Remove trailing slashes
+	for ; i > 0 && path[i] == '/'; i-- {
+		path = path[:i]
+	}
+
+	// Remove leading directory path
+	for i--; i >= 0; i-- {
+		if path[i] == '/' {
+			dirname = path[:i+1]
+			basename = path[i+1:]
+			break
+		}
+	}
+
+	return dirname, basename
+}
+
 func fixRootDirectory(p string) string {
 	return p
 }