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Merged
merged 2 commits into from
Jan 21, 2023
Merged

Have configure abort if building for 32 bit #11282

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8529eb8
configure.ac: disable 32-bit builds
jsquyres Jan 9, 2023
48e557c
docs: remove mentions of 32-bit support
jsquyres Jan 9, 2023
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6 changes: 5 additions & 1 deletion configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@
# University of Stuttgart. All rights reserved.
# Copyright (c) 2004-2005 The Regents of the University of California.
# All rights reserved.
# Copyright (c) 2006-2022 Cisco Systems, Inc. All rights reserved
# Copyright (c) 2006-2023 Cisco Systems, Inc. All rights reserved.
# Copyright (c) 2006-2008 Sun Microsystems, Inc. All rights reserved.
# Copyright (c) 2006-2017 Los Alamos National Security, LLC. All rights
# reserved.
Expand Down Expand Up @@ -458,6 +458,10 @@ AC_CHECK_SIZEOF(double _Complex)
AC_CHECK_SIZEOF(long double _Complex)

AC_CHECK_SIZEOF(void *)
AS_IF([test "$ac_cv_sizeof_void_p" -eq 4],
[AC_MSG_WARN([Open MPI no longer supports 32 bit builds.])
AC_MSG_WARN([Please use Open MPI v4.x or earlier if you need 32 bit support.])
AC_MSG_ERROR([Cannot continue])])
AC_CHECK_SIZEOF(size_t)
if test "$ac_cv_type_ssize_t" = yes ; then
AC_CHECK_SIZEOF(ssize_t)
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13 changes: 0 additions & 13 deletions docs/faq/supported-systems.rst
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Expand Up @@ -153,19 +153,6 @@ releases continually improve reliability and performance of
multi-threaded MPI applications.


/////////////////////////////////////////////////////////////////////////

Does Open MPI support 32 bit environments?
------------------------------------------

As far as we know, yes. 64 bit architectures have effectively taken
over the world, though, so 32-bit is not tested nearly as much as
64-bit.

Specifically, most of the Open MPI developers only have 64-bit
machines, and therefore only test 32-bit in emulation mode.


/////////////////////////////////////////////////////////////////////////

Does Open MPI support 64 bit environments?
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5 changes: 3 additions & 2 deletions docs/release-notes/platform.rst
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Expand Up @@ -22,8 +22,7 @@ Platform Notes

* Other systems have been lightly (but not fully) tested:

* Linux (various flavors/distros), 32 bit, with gcc
* Cygwin 32 & 64 bit with gcc
* Cygwin 64 bit with gcc
* ARMv6, ARMv7, ARMv9
* Other 64 bit platforms.
* OpenBSD. Requires configure options ``--enable-mca-no-build=patcher``
Expand All @@ -32,6 +31,8 @@ Platform Notes
using the clang-4.0 system compiler. A workaround is to build
Open MPI using the GNU compiler.

.. note:: 32-bit environments are no longer supported.

* The run-time systems that are currently supported are:

* ssh / rsh
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