On Feb 24, 2006, at 5:25 AM, Pierre Valiron wrote:

I have tried to build the 1.0.2a8 version on Solaris Opteron with Sun Studio 11. The configure fails on attempting to guess the largest fortran integer. I attach my build script, and output from configure.

Hopefully there is a simple fix.

Open MPI has both a Fortran 77 and Fortran 90 bindings layer, so we configure and test both compilers. You need to add two more environment variables to get Open MPI configured correctly:

F77=f77
FCFLAGS="-O -xtarget=opteron -xarch=amd64"

The F77 / FFLAGS set the Fortran 77 compiler and its associated flags. FC / FCFLAGS set the Fortran (90,95,03) compiler and its associated flags.

Because F77 was unset, configure tried using the g77 it found in your path. But because FFLAGS *was* set, it tried using the arguments in FFLAGS, which are for Sun's compiler, not gcc.

Hope this makes sense,

Brian


--
  Brian Barrett
  Open MPI developer
  http://www.open-mpi.org/


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