[testsuite/guality] Fix tcl error on gdb -v failure

2018-06-25  Tom de Vries  <tdevries@suse.de>

	* lib/gcc-gdb-test.exp (report_gdb): Handle gdb -v failure.

From-SVN: r262021

gcc/testsuite/ChangeLog

+2018-06-25  Tom de Vries  <tdevries@suse.de>
+
+	* lib/gcc-gdb-test.exp (report_gdb): Handle gdb -v failure.
+
 2018-06-25  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/84786

gcc/testsuite/lib/gcc-gdb-test.exp

@@ -151,6 +151,12 @@ proc report_gdb { gdb loc } {
     }
     set gdb [exec which $gdb]
     send_log "gdb used in $loc: $gdb\n"
-    set gdb_version [exec $gdb -v]
-    send_log "gdb used in $loc: version:\n---\n$gdb_version\n---\n"
+
+    send_log "gdb used in $loc: "
+    if { [catch { exec $gdb -v } gdb_version] } {
+	send_log "getting version failed:\n"
+    } else {
+	send_log "version:\n"
+    }
+    send_log -- "---\n$gdb_version\n---\n"
 }