[mvapich-discuss] Building MVAPICH2 1.8a2/1.7 difficulties with PGI 12.2

[Jonathan Perkins]

On Fri, Feb 24, 2012 at 09:09:27AM -0500, Thompson, Matt (GSFC-610.1)[SCIENCE SYSTEMS AND APPLICATIONS INC] wrote:
> I have been having difficulty building MVAPICH2 1.8a2 (and, indeed
> MVAPICH2 1.7) with PGI 12.2, while I can build with PGI 11.10 (and
> others can with 12.1). When you build with:

Thanks for the report, we have not yet updated to PGI 12.2 in our
testing environment but will do so soon.

> 
> env CC=pgcc CXX=pgCC FC=pgfortran F77=pgfortran ./configure
> --prefix=/home/user/mvapich2-18a2-nemesis --with-device=ch3:nemesis | &
> tee configure.log
> 
> The make fails with:
> 
>  make[5]: Entering directory
> `/home/user/src/mvapich2-1.8a2/src/pm/hydra/tools/topo/hwloc/hwloc/src'
>    CC     topology.lo
>    CC     traversal.lo
>    CC     distances.lo
>  PGC-S-0039-Use of undeclared variable __FLT_MAX__ (distances.c: 325)
>  PGC-S-0039-Use of undeclared variable __FLT_MIN__ (distances.c: 325)
>  PGC/x86-64 Linux 12.2-0: compilation completed with severe errors
> 
> I have been able to determine that this is due to a new ifndef in
> float.h with PGI 12.2:
> 
> (214) > diff /opt/pgi/linux86-64/11.10/include/float.h
> /opt/pgi/linux86-64/12.2/include/float.h
> 15a16
> > #if !defined(_GNU_SOURCE)
> 50a52
> > #endif
> 
> which surrounds the code containing these macros. I've inquired with PGI
> as to why this ifndef is now included with 12.2.
> 
> But, in the meantime, I did try to configure adding
> CPPFLAGS=-D_GNU_SOURCE but that didn't help as the make still failed as
> above. hwloc does have its own complex system of ifdefs and ifndefs,
> perhaps that might be clearing this out? Plus, there might be bad
> effects to setting _GNU_SOURCE by fiat on the rest of MVAPICH2!

Yes, bad things have happened in the past.

> 
> Can anyone here think of a workaround (aside from editing PGI's float.h)
> that would allow this build to proceed for now?

I don't have a patch yet but we'll look into this and see if there is
some quick fix where a more localized _GNU_SOURCE definition is placed
for hwloc.

-- 
Jonathan Perkins
http://www.cse.ohio-state.edu/~perkinjo