Re: PATCH: Update default arch for x86

[Matthias Klose <doko at ubuntu dot com>]

On 27.02.2010 03:14, H.J. Lu wrote:
> On Fri, Feb 26, 2010 at 5:29 PM, Jack Howarth<howarth@bromo.med.uc.edu>  wrote:
> > On Fri, Feb 26, 2010 at 05:06:00PM -0500, Jason Merrill wrote:
> > > On 02/26/2010 03:56 PM, H.J. Lu wrote:
> > > > Here is the updated patch to replace arch_fpmath_pentium4 with
> > > > arch_without_sse2.  OK to install?
> > >
> > > OK.
> > >
> > > Jason
> >
> >    The current gcc trunk no longer allows darwin10 to build with the
> > configuration...
> >
> > ../gcc-4.5-20100226/configure --prefix=/sw --prefix=/sw/lib/gcc4.5 --mandir=/sw/share/man --infodir=/sw/share/info --enable-languages=c,c++,fortran,objc,obj-c++,java --with-gmp=/sw --with-libiconv-prefix=/sw --with-ppl=/sw --with-cloog=/sw --with-mpc=/sw --with-system-zlib --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib --disable-libjava-multilib --build=i686-apple-darwin10 --host=i686-apple-darwin10 --target=i686-apple-darwin10
> >
> > The build hangs in the x86_64 libgcc multilib subdirectory with the config.log errors there of...
>
> That will happen for all i[34567]86-*-* targets which also require 64bit ISA.
> This patch avoids setting the default arch if 64bit ISA is required and
> i[34567]86-*-* targets don't support 64bit ISA.

build of a biarch compiler on i486-linux-gnu fails, even with this patch applied:

--enable-shared --enable-threads=posix --enable-targets=all --with-arch-32=i486 
--with-tune=generic --enable-checking=yes --build=i486-linux-gnu 
--host=i486-linux-gnu --target=i486-linux-gnu

checking for x86_64-linux-gnu-gcc... 
/scratch/packages/gcc/4.5/u/gcc-4.5-4.5-20100227/build/./gcc/xgcc 
-B/scratch/packages/gcc/4.5/u/gcc-4.5-4.5-20100227/build/./gcc/ 
-B/usr/i486-linux-gnu/bin/ -B/usr/i486-linux-gnu/lib/ -isystem 
/usr/i486-linux-gnu/include -isystem /usr/i486-linux-gnu/sys-include  -m64
checking for suffix of object files... configure: error: in 
`/scratch/packages/gcc/4.5/u/gcc-4.5-4.5-20100227/build/i486-linux-gnu/64/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.
make[4]: *** [configure-stage1-target-libgcc] Error 1
make[4]: Leaving directory `/scratch/packages/gcc/4.5/u/gcc-4.5-4.5-20100227/build'
make[3]: *** [stage1-bubble] Error 2


configure:3232: /scratch/packages/gcc/4.5/u/gcc-4.5-4.5-20100227/build/./gcc/xgcc -
B/scratch/packages/gcc/4.5/u/gcc-4.5-4.5-20100227/build/./gcc/ -B/usr/i486-linux-gn
u/bin/ -B/usr/i486-linux-gnu/lib/ -isystem /usr/i486-linux-gnu/include -isystem /us
r/i486-linux-gnu/sys-include  -m64 -c -g -O2  conftest.c >&5
conftest.c:1:0: error: CPU you selected does not support x86-64 instruction set
configure:3236: $? = 1