https://bugs.llvm.org/show_bug.cgi?id=42298
Bug ID: 42298
Summary: -fopenmp-simd is incorrectly required for _OPENMP to
be defined to 201511
Product: OpenMP
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Clang Compiler Support
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
When OpenMP is enabled (via -fopenmp) the Macro _OPENMP should be defined to
the current standard supported in clang, i.e., 201511.
However, currently (as of clang 8.0) -fopenmp-simd needs to also be set to
define _OPENMP to 201511:
> clang -fopenmp -dM -E - < /dev/null | grep -i openmp
#define _OPENMP 201107
> clang -fopenmp-simd -fopenmp -dM -E - < /dev/null | grep -i openmp
#define _OPENMP 201511
One of the main reasons to do this is that OpenMP 4.5 includes things other
than simd operations (e.g. taskloops).
gcc (v7.4.0) and the intel compiler(2019) do it accordingly:
> g++ -fopenmp-simd -fopenmp -dD -E - < /dev/null | grep -i openmp
#define _OPENMP 201511
> g++ -fopenmp -dD -E - < /dev/null | grep -i openmp
#define _OPENMP 201511
> icpc -dD -E -qopenmp -qopenmp-simd - </dev/null | grep -i openmp
#define _OPENMP 201611
> icpc -dD -E -qopenmp - </dev/null | grep -i openmp
#define _OPENMP 201611
see also: https://bugs.llvm.org/show_bug.cgi?id=37536
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