[PATCH] Return argv0-symlink.exp early if gdb can't load symlink

[Yao Qi <yao@codesourcery.com>]

We run argv0-symlink.exp on mingw32 host, and see the following error
in gdb.log

(gdb) file argv0-symlink-filelink^M
"argv0-symlink-filelink": not in executable format: File format not recognized
(gdb) ERROR: Couldn't load argv0-symlink-filelink into arm-none-eabi-gdb.

the rest of the test don't have to run.

This patch expands clean_restart so that we can check the return value
of gdb_load.  Return if return value of gdb_load isn't zero.

Note that originally I added a unsupported statement to mention that
symlink is not supported, but perror in gdb_file_cmd changes it to
unresolved, so I remove that unsupported statement.

gdb/testsuite:

2014-04-02  Yao Qi  <yao@codesourcery.com>

	* gdb.base/argv0-symlink.exp: Return early if GDB can't load
	symlink successfully.
---
 gdb/testsuite/gdb.base/argv0-symlink.exp |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/gdb/testsuite/gdb.base/argv0-symlink.exp b/gdb/testsuite/gdb.base/argv0-symlink.exp
index 0e0202d..5e16b00 100644
--- a/gdb/testsuite/gdb.base/argv0-symlink.exp
+++ b/gdb/testsuite/gdb.base/argv0-symlink.exp
@@ -29,7 +29,14 @@ if {[lindex $status 0] != 0} {
     return 0
 }
 
-clean_restart "$filelink"
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+
+if { [gdb_load [standard_output_file ${filelink}]] != 0 } {
+    # GDB can't load symlink successfully, skip it.
+    return 0
+}
 
 if ![runto_main] {
     untested "could not run to main"
-- 
1.7.7.6