PR23235, make check uses system installed ld

[Alan Modra]

This patch doesn't stop the build-id and debuglink tests using the
installed ld, it just prevents a compiler failure from resulting in a
test fail.  We could move the tests to the ld testsuite but it doesn't
seem all that important.

	PR 23235
	* testsuite/binutils-all/compress.exp (test_gnu_debuglink): Return
	unsupported rather than fail on compile errors.
	* testsuite/binutils-all/objdump.exp (test_build_id_debuglink):
	Likewise.  Save and restore CFLAGS_FOR_TARGET.

diff --git a/binutils/testsuite/binutils-all/compress.exp b/binutils/testsuite/binutils-all/compress.exp
index 12a43b025c..edbe9dd5ca 100644
--- a/binutils/testsuite/binutils-all/compress.exp
+++ b/binutils/testsuite/binutils-all/compress.exp
@@ -692,7 +692,7 @@ proc test_gnu_debuglink {} {
     }
 
     if { [target_compile $srcdir/$subdir/testprog.c tmpdir/testprog exectuable debug] != "" } {
-	fail "$test (build)"
+	unsupported "$test (build)"
 	return
     }
     set got [remote_exec host "$OBJDUMP -S tmpdir/testprog" "" "/dev/null" "tmpdir/testprog.dump"]
diff --git a/binutils/testsuite/binutils-all/objdump.exp b/binutils/testsuite/binutils-all/objdump.exp
index b9232e9229..d9d07138aa 100644
--- a/binutils/testsuite/binutils-all/objdump.exp
+++ b/binutils/testsuite/binutils-all/objdump.exp
@@ -363,14 +363,21 @@ proc test_build_id_debuglink {} {
     }
 
     # Use a fixed build-id.
+    if { [info exists CFLAGS_FOR_TARGET] } {
+	set save_CFLAGS_FOR_TARGET $CFLAGS_FOR_TARGET
+    }
     set CFLAGS_FOR_TARGET "-g -Wl,--build-id=0x12345678abcdef01"
 
     if { [target_compile $srcdir/$subdir/testprog.c tmpdir/testprog exectuable debug] != "" } {
-	fail "$test (build)"
+	unsupported "$test (build)"
 	return
     }
 
-    # FIXME: Do we need to restore CFLAGS_FOR_TARGET to its old value ?
+    if { [info exists save_CFLAGS_FOR_TARGET] } {
+	set CFLAGS_FOR_TARGET $save_CFLAGS_FOR_TARGET
+    } else {
+	unset CFLAGS_FOR_TARGET
+    }
 
     if { [binutils_run $STRIP "--strip-debug --remove-section=.comment tmpdir/testprog -o tmpdir/testprog.strip"] != "" } {
 	fail "$test (strip debug info)"

-- 
Alan Modra
Australia Development Lab, IBM