William Gropp <[email protected]> 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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