https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106670
Bug ID: 106670
Summary: [OpenMP][5.2] Warn for unknown '!$ompx' (!$omx')
sentinels
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Keywords: diagnostic, openmp
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: burnus at gcc dot gnu.org
CC: jakub at gcc dot gnu.org
Target Milestone: ---
OpenMP 5.2 reserves 'ompx' ('!$ompx') and for fixed-form Fortran !/*/c + $omx',
used "for implementation-defined extensions to the OpenMP directives."
For C/C++, those are diagnosed – either by default (-Wattributes) or with
some flag (-Wunknown-pragmas), implied by -Wall:
foo.C:1: warning: ignoring ‘#pragma ompx nothing2’ [-Wunknown-pragmas]
1 | #pragma ompx nothing2
|
foo.C:2:1: warning: attribute ignored [-Wattributes]
2 | [[ompx::directive (nothing2)]];
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
However, for Fortran, !$ompx is silently ignored. I think it would be useful to
have some flag to warn about unknown '!$ompx' that can be silenced.
We currently support:
!$omp<space> → -fopenmp
!$<space> → -fopenmp (Conditional Compilation Sentinel)
!$acc<space> → -fopenacc
!GCC$ →
https://gcc.gnu.org/onlinedocs/gfortran/GNU-Fortran-Compiler-Directives.html
Questions:
* What to warn for – only !$ompx/!$omx or more?
* Which -W... to use for this? Especially when only warning for
Examples:
!$omp nothing2 ! only free form
!$omx nothing2 ! only fixed form
