GCC build failure, HEAD@193947 on native

[GCC regression tester]

With your recent patch, GCC HEAD revision 193947 had problems on:
native: build (about the same as the previous build)
Attached is build output for those targets.
The previous build was of revision 193945.

Log information for changes since the last build:
------------------------------------------------------------------------
r193946 | ktietz | 2012-11-29 10:40:27 -0800 (Thu, 29 Nov 2012) | 5 lines
Changed paths:
   M /trunk/gcc/ChangeLog
   M /trunk/gcc/prefix.c

	PR target/53912
	* prefix.c (lookup_key): Replace xmalloc/xrealloc
	use by XNEWVEC/XRESIZEVEC.


------------------------------------------------------------------------

For more information, see <http://glutton.geoffk.org/HEAD/>.

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libtool: compile: unrecognized option `-D_GNU_SOURCE'
libtool: compile: unrecognized option `-D_GNU_SOURCE'
libtool: compile: Try `libtool --help' for more information.
libtool: compile: Try `libtool --help' for more information.
make[4]: *** [interception_linux.lo] Error 1
make[4]: *** Waiting for unfinished jobs....
make[4]: *** [interception_win.lo] Error 1
libtool: compile: unrecognized option `-D_GNU_SOURCE'
libtool: compile: Try `libtool --help' for more information.
make[4]: *** [interception_mac.lo] Error 1
make[4]: Leaving directory `/home/regress/tbox/native/build/i686-pc-linux-gnu/libsanitizer/interception'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/home/regress/tbox/native/build/i686-pc-linux-gnu/libsanitizer'
make[2]: *** [all-stage1-target-libsanitizer] Error 2
make[2]: Leaving directory `/home/regress/tbox/native/build'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/home/regress/tbox/native/build'
make: *** [bootstrap] Error 2
+ '[' -s .bad_compare ']'
+ exit 1
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-- 
Geoffrey Keating <geoffk@geoffk.org> 
(via an automated GCC regression-testing script.)