Re: [bgl-discuss] blrts_xlc and configure

[Anthony Chan <chan@xxxxxxxxxxx>]

On Wed, 9 Feb 2005, Robert Latham wrote:

> On Tue, Feb 08, 2005 at 12:19:20AM -0600, Boyana Norris wrote:
> > When I use the blrts_xlc script instead of xlc directly, configure is 
> > unable to determine the size of short (and crashes, I haven't had time 
> > to investigate which of the three abnormal exits happens). Has anyone 
> > run into this problem? The relevant ac macro is AC_CHECK_SIZEOF(short), 
> > and this particular configure is in netCDF 3.6.0, generated using 
> > autoconf version >= 2.59.
> 
> Guess i'm a little late to the party...
> 
> We ran into a problem like this with PVFS2. If we run configure like
> this: 
> 
> configure --build powerpc32-unknown-gnu --host powerpc-suse-linux
> 
> then through some magic i don't fully understand autoconf does not use
> runtime tests to figure out sizes.  
>

AC_CHECK_SIZEOF test does not require MPI's runtime, it can run with 
xlc (not blrts_xlc or xlc -F /etc/opt/ibmcmp/blrts-ppcfloor.cfg).
If the configure.in switches between xlc and blrts_xlc when invoking 
runtime tests like AC_CHECK_SIZEOF, AC_C_BIGENDIAN, autoconf runtime tests 
should work fine on bgl.  One example, MPE's configure take 2 set of 
compilers: CC/F77 for serial tests and MPI_CC/MPI_F77/MPI_INC/MPI_LIBS for 
MPI related tests.  I was able to configure MPE for bgl's MPI without 
invoking its cross-compilation support. 

A.Chan

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