[patch] Handle absent "/usr/sbin/" in prelink error output.

[dje@google.com (Doug Evans)]

Hi.

I'm seeing the following output from prelink:

prelink: /g3/gnu/sourceware/pretty-printers/build/obj64/gdb/testsuite/gdb.base/attach-pie-misread.d/ld-linux-x86-64.so.2 does not have .gnu.prelink_undo section

which causes attach-pie-misread.exp to fail with:

FAIL: gdb.base/attach-pie-misread.exp: unprelink ld-linux-x86-64.so.2 pre-unprelink

I will check in the following patch in two days if there are no objections.

2010-11-16  Doug Evans  <dje@google.com>

	* lib/prelink-support.exp (prelink_no): Handle absent "/usr/sbin/"
	in prelink error output.

Index: lib/prelink-support.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/lib/prelink-support.exp,v
retrieving revision 1.3
diff -u -p -r1.3 prelink-support.exp
--- lib/prelink-support.exp	12 Oct 2010 18:12:49 -0000	1.3
+++ lib/prelink-support.exp	16 Nov 2010 21:06:58 -0000
@@ -221,7 +221,7 @@ proc prelink_no {arg {name {}}} {
     }
     # Last line does miss the trailing \n.  There can be multiple such messages
     # as ARG may list multiple files.
-    if {$result == 1 && [regexp {^(/usr/sbin/prelink[^\r\n]*: [^ ]* does not have .gnu.prelink_undo section\n?)*$} $output]} {
+    if {$result == 1 && [regexp {^((/usr/sbin/)?prelink[^\r\n]*: [^ ]* does not have .gnu.prelink_undo section\n?)*$} $output]} {
 	pass $test
 	return 1
     } else {