Re: Re: Debian powerpc binary compatibility?

[Xavier Grave <grave@ipno.in2p3.fr>]

Hi,



> However, the auxiliary math routins in libgcc.a (.so) will be the same,
and
> not optimized for the given CPU type.
> Gcc compiler should be build with "multilib" support enabled, in this case
> the build provides specialized libgcc.a and startup .o modules for each
> possible "-mcpu", in separate subdirs in 
> /usr/lib/gcc//gcc-/.

Under squeeze :
$ apt-file search libgcc.a
gcc-4.1: /usr/lib/gcc/x86_64-linux-gnu/4.1/libgcc.a
gcc-4.1-multilib: /usr/lib/gcc/x86_64-linux-gnu/4.1.2/32/libgcc.a
gcc-4.1-multilib: /usr/lib/gcc/x86_64-linux-gnu/4.1/32/libgcc.a
gcc-4.3: /usr/lib/gcc/x86_64-linux-gnu/4.3/libgcc.a
gcc-4.3-multilib: /usr/lib/gcc/x86_64-linux-gnu/4.3/32/libgcc.a
gcc-4.4: /usr/lib/gcc/x86_64-linux-gnu/4.4/libgcc.a
gcc-4.4-multilib: /usr/lib/gcc/x86_64-linux-gnu/4.4/32/libgcc.a

So with apt-build you can rebuild libgcc.a with the options you want.

> (I wonder - is it the big gain having them optimized?)

Only the rigour of experimental tests will tell you :) (raw translation of
"Seul de la rigueur expérimentale naîtra la vérité" :) )

> Thanks a lot for reply.

You are welcome,
xavier