GCC build failure, HEAD@170139 on native

[GCC regression tester]

With your recent patch, GCC HEAD revision 170139 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 170138.

Log information for changes since the last build:
------------------------------------------------------------------------
r170139 | jakub | 2011-02-14 08:40:38 -0800 (Mon, 14 Feb 2011) | 5 lines
Changed paths:
   M /trunk/libquadmath/ChangeLog
   M /trunk/libquadmath/configure
   M /trunk/libquadmath/configure.ac
   M /trunk/libquadmath/printf/printf_fp.c
   M /trunk/libquadmath/printf/quadmath-printf.h

	* configure.ac (HAVE_HIDDEN_VISIBILITY): Test with -Werror in CFLAGS.
	* printf/printf_fp.c: Don't include <alloca.h>.
	* printf/quadmath-printf.h (_itoa): Redefine to __quadmath_itoa.
	* configure: Regenerated.

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

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

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				INSTALL_PROGRAM="/usr/bin/install -c" \
				INSTALL_SCRIPT="/usr/bin/install -c" \
				all); then \
		  true; \
		else \
		  exit 1; \
		fi; \
	      else true; \
	      fi; \
	    fi; \
	  done; \
	fi
make[5]: Leaving directory `/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3'
make[4]: Leaving directory `/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3'
make[3]: Leaving directory `/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3'
make[2]: Leaving directory `/home/regress/tbox/native/build/i686-pc-linux-gnu/libstdc++-v3'
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.)