Re: [ros-dev] GCC 4.4.x -- What's missing?

[Alex Ionescu]

Colin, on OS X I built RosBE for 32-bits, and I think we should force that for the
moment...

On 2010-01-01, at 8:26 AM, Colin Finck wrote:

>   Dmitry Gorbachev wrote:
> >   What does not work?
> >  
> >  ./configure CFLAGS="..." ABI=32 
>  
>  Well, this would require us to build the entire RosBE-Unix toolchain for
>  32-bit as well (while all other RosBE-Unix versions built native 64-bit
>  binaries on 64-bit machines so far). It would also make RosBE more
>  CPU-dependent, a thing I'd like to avoid.
>  If you look into GMP's configure script, you'll also see that there are many
>  architectures which don't support a simple ABI=32 value. Even if these
>  architectures might currently not be interesting for us, they can certainly
>  be in the future.
>  
>  GMP's ABI detection seems to be entirely based on the host CPU, but doesn't
>  consider the host OS. So if you're running a 32-bit OS on a 64-bit CPU, GMP
>  will detect ABI=64 and fail.
>  The only workaround I can currently think of would be checking `uname -m`
>  for "i*86" and setting ABI=32 in this case. Otherwise we'll let GMP
>  autodetect the ABI value.
>  
>  But maybe someone else has better ideas.
>  I'd be surprised if I'm the first to notice that the common build procedure
>  "configure && make && make install" fails for such a simple
> configuration as
>  having a 32-bit OS running on a 64-bit CPU.
>  
>  Best regards,
>  
>  Colin
>  
>  
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Best regards,
Alex Ionescu