Fix bootstrap/25672

[PaweÅ Sikora <pluto at agmk dot net>]

hi,

during crossbuild for ppc64 i get on an error
because xgcc pickups wrong cflags for target objects.

e.g.:

(...)
/home/users/pluto/rpm/BUILD/gcc-4_1-branch/obj-ppc64-pld-linux/./gcc/xgcc \
-B/home/users/pluto/rpm/BUILD/gcc-4_1-branch/obj-ppc64-pld-linux/./gcc/ \
-B/usr/ppc64-pld-linux/bin/ -B/usr/ppc64-pld-linux/lib/ \
-isystem /usr/ppc64-pld-linux/include -isystem /usr/ppc64-pld-linux/sys-include\
-O2 -O2 -march=x86-64 -O2 -pipe -Wall  -DIN_GCC -DCROSS_COMPILE \
-W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes \
-Wold-style-definition  -isystem ./include  -I. -I. -I../../gcc \
-I../../gcc/. -I../../gcc/../include -I../../gcc/../libcpp/include \
-g0 -finhibit-size-directive -fno-inline-functions -fno-exceptions \
-fno-zero-initialized-in-bss -fno-unit-at-a-time -Dinhibit_libc -msdata=none\
          -c ../../gcc/crtstuff.c -DCRT_BEGIN \
          -o crtbegin.o
cc1: error: unrecognized command line option "-march=x86-64"

attached patch fixes this bug for me.

--- gcc-4.1-20060106/Makefile.in.orig	2005-12-15 15:02:02.000000000 +0100
+++ gcc-4.1-20060106/Makefile.in	2006-01-08 19:27:18.406458250 +0100
@@ -329,9 +329,9 @@
 # CFLAGS will be just -g.  We want to ensure that TARGET libraries
 # (which we know are built with gcc) are built with optimizations so
 # prepend -O2 when setting CFLAGS_FOR_TARGET.
-CFLAGS_FOR_TARGET = -O2 $(CFLAGS) $(SYSROOT_CFLAGS_FOR_TARGET)
+CFLAGS_FOR_TARGET = -O2 $(SYSROOT_CFLAGS_FOR_TARGET)
 SYSROOT_CFLAGS_FOR_TARGET = @SYSROOT_CFLAGS_FOR_TARGET@
-CXXFLAGS_FOR_TARGET = $(CXXFLAGS) $(SYSROOT_CFLAGS_FOR_TARGET)
+CXXFLAGS_FOR_TARGET = -O2 $(SYSROOT_CFLAGS_FOR_TARGET)
 LIBCFLAGS_FOR_TARGET = $(CFLAGS_FOR_TARGET)
 LIBCXXFLAGS_FOR_TARGET = $(CXXFLAGS_FOR_TARGET) -fno-implicit-templates
 LDFLAGS_FOR_TARGET =