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.. _compiler-notes-section-label:
Compiler Notes
==============
* PMIx requires a C99-capable compiler to build.
* PMIx requires a compiler that either supports C11 atomics or the GCC
``__atomic`` atomics (e.g., GCC >= v4.8.x).
* 32-bit platforms are not currently supported.
* In general, the latest versions of compilers of a given vendor's
series have the least bugs. We have seen cases where Vendor XYZ's
compiler version A.B fails to compile PMIx, but version A.C
(where C>B) works just fine. If you run into a compile failure, you
might want to double check that you have the latest bug fixes and
patches for your compiler.
* PMIx does not support the PGI compiler suite on OS X or MacOS.
See issues below for more details:
* https://github.com/open-mpi/ompi/issues/2604
* https://github.com/open-mpi/ompi/issues/2605
* At least some versions of the Intel 8.1 compiler seg fault while
compiling certain PMIx source code files. As such, it is not
supported.
* It has been reported that the Intel 9.1 and 10.0 compilers fail to
compile PMIx on IA64 platforms. As of 12 Sep 2012, there is
very little (if any) testing performed on IA64 platforms (with any
compiler). Support is "best effort" for these platforms, but it is
doubtful that any effort will be expended to fix the Intel 9.1 /
10.0 compiler issuers on this platform.
* Early versions of the Intel 12.1 Linux compiler suite on x86_64 seem
to have a bug that prevents PMIx from working. Symptoms
including immediate segv of the wrapper compiler (``pmixcc``) and
PMIx-based applications. If you upgrade to the latest
version of the Intel 12.1 Linux compiler suite, the problem will go
away.
* The Portland Group compilers prior to version 7.0 require the
``-Msignextend`` compiler flag to extend the sign bit when converting
from a shorter to longer integer. This is different than other
compilers (such as GNU). When compiling PMIx with the Portland
compiler suite, the following flags should be passed to PMIx's
``configure`` script:
.. code-block:: sh
shell$ ./configure CFLAGS=-Msignextend \
--with-wrapper-cflags=-Msignextend ...
This will both compile PMIx with the proper compile flags and
also automatically add ``-Msignextend`` when the C wrapper
compiler is used to compile user PMIx-based applications.
* It has been reported that Pathscale 5.0.5 and 6.0.527 compilers
give an internal compiler error when trying to build PMIx.
* As of July 2017, the Pathscale compiler suite apparently has no
further commercial support, and it does not look like there will be
further releases. Any issues discovered regarding building /
running PMIx with the Pathscale compiler suite therefore may not
be able to be resolved.
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