misc/cgo/testsanitizers: accept compilers that don't report location

It appears that GCC before version 10 doesn't report file/line
location for asan errors.

Change-Id: I03ee24180ba365636596aa2384961df7ce6ed71f
Reviewed-on: https://go-review.googlesource.com/c/go/+/374874
Trust: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

misc/cgo/testsanitizers/asan_test.go

@@ -63,7 +63,11 @@ func TestASAN(t *testing.T) {
 					// symbolizer program and can't find it.
 					const noSymbolizer = "external symbolizer"
 					// Check if -asan option can correctly print where the error occured.
-					if tc.errorLocation != "" && !strings.Contains(out, tc.errorLocation) && !strings.Contains(out, noSymbolizer) {
+					if tc.errorLocation != "" &&
+						!strings.Contains(out, tc.errorLocation) &&
+						!strings.Contains(out, noSymbolizer) &&
+						compilerSupportsLocation() {
+
 						t.Errorf("%#q exited without expected location of the error\n%s; got failure\n%s", strings.Join(cmd.Args, " "), tc.errorLocation, out)
 					}
 					return

misc/cgo/testsanitizers/cc_test.go

@@ -218,6 +218,23 @@ func compilerVersion() (version, error) {
 	return compiler.version, compiler.err
 }
 
+// compilerSupportsLocation reports whether the compiler should be
+// able to provide file/line information in backtraces.
+func compilerSupportsLocation() bool {
+	compiler, err := compilerVersion()
+	if err != nil {
+		return false
+	}
+	switch compiler.name {
+	case "gcc":
+		return compiler.major >= 10
+	case "clang":
+		return true
+	default:
+		return false
+	}
+}
+
 type compilerCheck struct {
 	once sync.Once
 	err  error