All -- Unless someone has a strong reason for keeping support for GCC 4.4.7 (i.e., the default GCC compiler that shipped in RHEL 6), Open MPI is going to drop support for it in v5.0.0.
The reason for this is that PRTE and PMIX no longer compile successfully with GCC 4.4.7 (and Open MPI gets a lot of compiler warnings with GCC 4.4.7). These packages ***could be updated to support GCC 4.4.7 if someone cares***. But we'll need someone to contribute pull requests to do so. If no one plans to contribute pull requests for this in the near future, we're doing to drop support for GCC 4.4.7 in Open MPI v5.0.0. See https://github.com/open-mpi/ompi/pull/9398. * Note that RHEL 7 ships with GCC v4.8.5. * The Open MPI community regularly tests with GCC v4.8.1. Hence, Open MPI >= v5.0.0 will support GCC >= v4.8.1. Specifically: Open MPI's configure script will abort with helpful error message for versions of GCC < v4.8.1. Finally, note that this announcement is solely about Open MPI >= v5.0.0. The Open MPI v4.0.x and v4.1.x series will continue to support GCC 4.4.7. -- Jeff Squyres jsquy...@cisco.com
