[PING]^N Fix ppc64 bootstrap with a -m32 host compiler

[Richard Guenther]

On Thu, 22 Jun 2006, DJ Delorie wrote:

> 
> >         * Makefile.in: Use correct libiberty if bootstrapping
> >         in a semi-cross environment.
> 
> Why is the build_libiberty inappropriate?

Because it is a 32bit object.  The host compiler that builds stage1
defaults to 32bit code generation while config.guess (correctly) sees
a powerpc64-unknown-linux-gnu host.  So you get linker failures building
stage2:

/abuild/obj/./prev-gcc/xgcc -B/abuild/obj/./prev-gcc/ 
-B/usr/local/powerpc64-unknown-linux-gnu/bin/   -g -O2 -DIN_GCC   -W -Wall 
-Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic 
-Wno-long-long -Wno-variadic-macros -Wold-style-definition 
-Wmissing-format-attribute -Werror -fno-common   -DHAVE_CONFIG_H 
-DGENERATOR_FILE  -o build/genmodes \
 build/genmodes.o build/errors.o 
../build-powerpc64-unknown-linux-gnu/libiberty/libiberty.a
collect2: ld terminated with signal 11 [Segmentation fault]
/usr/bin/ld: warning: powerpc:common architecture of input file 
`../build-powerpc64-unknown-linux-gnu/libiberty/libiberty.a(xmalloc.o)' is 
incompatible with powerpc:common64 output
...


You can try to work around this by building a cross compiler using
--host=powerpc-linux-gnu --target=powerpc64-linux-gnu, but the you run
into

make[2]: *** No rule to make target 
`/usr/local/bin/powerpc64-linux-gnu-as', needed by `stamp-as'.  Stop.
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory `/abuild/obj2/gcc'

because, well - it's appearantly more complicated to set it up


Working around this by specifying CC="gcc -m64" works though.

Richard.

--
Richard Guenther <rguenther@suse.de>
Novell / SUSE Labs