OpenMP SIMD compiler support detection in CMake #1334
Description
Detect if the compiler supports OpenMP and #pragma omp simd then set an HAVE_OPEN_SIMD=1 flag accordingly. The HAVE_OPEN_SIMD flag could be used in #1331 and later on for any SIMD vectorization in the project.
The basic CMake for this would look something like:
- Check if compiler/toolchain supports basic OpenMP with FindOpenMP
- If supported, set CMake OpenMP compiler flags
However detecting support for #pragma omp simd specifically could require more checks as different compilers support the SIMD subset of OpenMP unevenly, see clang has limited support for vectorization.
Using a try_compile method could be a good option, I will update this issue as I try out some solutions.