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Add infrastructure for openmp4 compat

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This commit is contained in:
Michael Lamparski
2019-08-28 11:09:57 -04:00
parent 54c2381632
commit 9a1b4a8edb
5 changed files with 46 additions and 35 deletions
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8
doc/src/Build_basics.rst
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@ -145,11 +145,9 @@ Some compilers do not fully support the ``default(none)`` directive
and others (e.g. GCC version 9 and beyond) may implement OpenMP 4.0
semantics, which are incompatible with the OpenMP 3.1 semantics used
in LAMMPS (for maximal compatibility with compiler versions in use).
In those case, all ``default(none)`` directives (which aid in detecting
incorrect and unwanted sharing) can be replaced with ``default(shared)``
while dropping all ``shared()`` directives. The script
'src/USER-OMP/hack_openmp_for_pgi_gcc9.sh' can be used to automate
this conversion.
LAMMPS will try to detect compilers that use OpenMP 4.0 semantics and
change the directives accordingly, but if your compiler is not
detected, you may set the CMake variable ``-D LMP_OMP_COMPAT=4``.
----------