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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Date: Fri, 22 May 2020 08:37:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D93826

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #4 from Tobias Burnus <burnus at gcc dot gnu.org> ---
OpenMP 5 lists under changes:

"The collapse of associated loops that are imperfectly nested loops was def=
ined
for the worksharing-loop (see Section 2.9.2 on page 10), simd (see Section
2.9.3.1 on page 110), taskloop (see Section 2.10.2 on page 140) and distrib=
ute
(see Section 2.9.4.2 on page 123) constructs."

worksharing: https://www.openmp.org/spec-html/5.0/openmpsu41.html
simd:        https://www.openmp.org/spec-html/5.0/openmpsu42.html
taskloop:    https://www.openmp.org/spec-html/5.0/openmpsu47.html
distribute:  https://www.openmp.org/spec-html/5.0/openmpsu43.html

Both C and Fortran example compile with PGI, PGI does set the variable to
"x=3D5".=20

The Intel compiler rejects C + Fortran code, Clang rejects the C example.

Hence:
=E2=80=93 OpenMP 4.5:
  * gfortran has accept-invalid+diagnostic bug
- OpenMP 5:
  * gfortran needs to diagnose 'order(concurrent)'
    (once the 'order' clause is implemented)
  * gcc/g++/gfortran needs to handle intervening code in the other cases.
- OpenACC: need to reject the code.=