[gdb/testsuite] Allow nodebug srcfile in gdb.base/unwind-on-each-insn.exp

Test-case gdb.base/unwind-on-each-insn.exp compiles $srcfile with debug info, and
$srcfile2 without.

Occasionally, I try both files with debug info:
...
-             $srcfile $debug_flags $srcfile2 $nodebug_flags]]} {
+             $srcfile $debug_flags $srcfile2 $debug_flags]]} {
...
and both files without:
...
-             $srcfile $debug_flags $srcfile2 $nodebug_flags]]} {
+             $srcfile $nodebug_flags $srcfile2 $nodebug_flags]]} {
...

In the latter case, I run into:
...
FAIL: gdb.base/unwind-on-each-insn.exp: foo: instruction 1: bt 2
FAIL: gdb.base/unwind-on-each-insn.exp: foo: instruction 1: up
...
due to a mismatch between the regexp and the different output due to using
nodebug.

Fix this by making the regexp less strict.

Tested on x86_64-linux.

1 files changed, 2 insertions, 2 deletions

diff --git a/gdb/testsuite/gdb.base/unwind-on-each-insn.exp b/gdb/testsuite/gdb.base/unwind-on-each-insn.exp
index a5e43c6..d6f90dd 100644
--- a/gdb/testsuite/gdb.base/unwind-on-each-insn.exp
+++ b/gdb/testsuite/gdb.base/unwind-on-each-insn.exp
@@ -111,11 +111,11 @@ proc do_test { function step_cmd } {
 		"check frame-id matches"
 
 	    # Check that the previous frame is 'main'.
-	    gdb_test "bt 2" "\r\n#1\\s+\[^\r\n\]+ in main \\(\\) .*"
+	    gdb_test "bt 2" "\r\n#1\\s+\[^\r\n\]+ in main \\(\\)( .*)?"
 
 	    # Move up the stack (to main).
 	    gdb_test "up" \
-		"\r\n#1\\s+\[^\r\n\]+ in main \\(\\) .*"
+		"\r\n#1\\s+\[^\r\n\]+ in main \\(\\)( .*)?"
 
 	    # Check we can unwind the stack-pointer and the frame base
 	    # address correctly.