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Older versions of the OpenMP specification were not clear about what counted as device usage. Newer (like TR13) are rather clear. Hence, this commit adds GCC's target-used flag also when a 'declare target' or an 'interop' are encountered. (The latter only to Fortran as C/C++ parsing support is still missing.) TR13 also lists 'dispatch' as target-used construct (as it has the device clause) and 'device_safesync' as clause with global requirement property, but both are not yet supported in GCC. gcc/c/ChangeLog: * c-parser.cc (c_parser_omp_declare_target): Set target-used bit in omp_requires_mask. gcc/cp/ChangeLog: * parser.cc (cp_parser_omp_declare_target): Set target-used bit in omp_requires_mask. gcc/fortran/ChangeLog: * parse.cc (decode_omp_directive): Set target-used bit of omp_requires_mask when encountering the declare_target or interop directive. gcc/testsuite/ChangeLog: * gfortran.dg/gomp/interop-1.f90: Add dg-error for missing omp requires requirement and declare_variant usage. * gfortran.dg/gomp/requires-8.f90: Likewise.
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