[openfabrics-ewg] RE: Open-MPI issue on PPC64 platform

[Pavel Shamis (Pasha)]

Ok, Vlad will add these flags to OFED build scripts.

But I think that for this platform the "-m64" flag should be added 
automatically by open-mpi configure script, because without this flag 
,the installation (mpicc and other wrappers) will not be functional from 
user point of view.

Regards,
Pasha.

Jeff Squyres (jsquyres) wrote:
> If you need additional flags to also be passed through the wrapper
> compilers, you need to use the following flags to Open MPI's configure:
> 
>   --with-wrapper-cflags   Extra flags to add to CFLAGS when using mpicc
>   --with-wrapper-cxxflags Extra flags to add to CXXFLAGS when using
> mpic++/mpiCC
>   --with-wrapper-fflags   Extra flags to add to FFLAGS when using mpif77
>   --with-wrapper-fcflags  Extra flags to add to FCFLAGS when using
> mpif90
> 
> Specifically, Open MPI does not automatically pass all flags supplied by
> CFLAGS, CXXFLAGS (etc.) specified by configure to the wrapper compiler
> because there are many cases where you want Open MPI built with one set
> of flags and your user app built with another (e.g., build an optimized
> MPI but build your application with -g).  So if you specify:
> 
>     ./configure --with-wrapper-cflags=-m64 --with-wrapper-cxxflags=-m64
> ...etc.
> 
> Then the wrapper flags will include -m64 and the user codes won't need
> to include that on their compile/link command lines.
> 
> 
>> -----Original Message-----
>> From: Pavel Shamis (Pasha) [mailto:pasha at mellanox.co.il] 
>> Sent: Sunday, May 21, 2006 1:02 PM
>> To: Jeff Squyres (jsquyres)
>> Cc: openfabrics-ewg-bounces at openib.org; vlad at mellanox.co.il
>> Subject: Open-MPI issue on PPC64 platform
>>
>> Hi Jeff,
>> We figured out the following issue with Open-Mpi installation 
>> on Fedora 
>> Core 4 PPC64 platform:
>> open-mpi passes the installation without problem and it 
>> builds 64bit mpi 
>> library. But if we try build some benchmarks (in our case mpitest 
>> package) the mpicc fails on linkage. On Fedora C4 PPC64 by 
>> default gcc 
>> use -m32 (!?) flag so in order to build 64bit binary you 
>> should add -m64 
>> flag and mpicc doesn't add it.
>>
>> Regards,
>> Pasha
>>
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