GCC build failure, HEAD@193945 on native

[GCC regression tester]

With your recent patch, GCC HEAD revision 193945 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 193944.

Log information for changes since the last build:
------------------------------------------------------------------------
r193945 | ian | 2012-11-29 10:11:17 -0800 (Thu, 29 Nov 2012) | 7 lines
Changed paths:
   M /trunk/gcc/go/ChangeLog
   M /trunk/gcc/go/Make-lang.in
   M /trunk/gcc/go/go-gcc.cc
   M /trunk/gcc/go/gofrontend/backend.h
   M /trunk/gcc/go/gofrontend/expressions.cc
   M /trunk/gcc/go/gofrontend/expressions.h
   M /trunk/gcc/go/gofrontend/gogo-tree.cc
   M /trunk/gcc/go/gofrontend/gogo.cc
   M /trunk/gcc/go/gofrontend/gogo.h
   M /trunk/gcc/go/gofrontend/runtime.def
   M /trunk/libgo/Makefile.am
   M /trunk/libgo/Makefile.in
   M /trunk/libgo/go/runtime/debug.go
   A /trunk/libgo/runtime/go-fieldtrack.c

compiler, runtime: Track fields with tag go:"track".

	* go-gcc.cc: Include "output.h".
	(global_variable): Add is_unique_section parameter.
	(global_variable_set_init): Adjust unique section if necessary.
	* Make-lang.in (go/go-gcc.o): Add dependency on output.h.

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

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

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libtool: compile: unrecognized option `-D_GNU_SOURCE'
libtool: compile: Try `libtool --help' for more information.
make[4]: *** [interception_linux.lo] Error 1
make[4]: *** Waiting for unfinished jobs....
libtool: compile: unrecognized option `-D_GNU_SOURCE'
libtool: compile: Try `libtool --help' for more information.
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.)