[petsc-dev] CFLAGS and COPTFLAGS

[Jed Brown]

William Gropp <wgropp at illinois.edu> writes:

> If the MPI wrapper adds -O, its buggy.  

MPICH puts CFLAGS into the wrappers.  Since this is the standard way of
specifying optimization when building a package, many users have
wrappers configured this way.  MPICH must be configured using
MPICHLIB_CFLAGS (formerly MPICH2LIB_CFLAGS) if they do not want the
optimization to go into the wrappers.  This causes real confusion such
as in this thread.

http://www.open-mpi.org/community/lists/users/2008/10/6924.php
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