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Add Windows OpenMP 2.0 compatibility #53

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Add Windows OpenMP 2.0 compatibility #53

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4be3c49
Add Windows support for GNU-style Clang and OpenMP 2.0 compatibility
tony-davis Jan 29, 2026
8f7876b
Simplify to only OpenMP 2.0 compatibility fix
tony-davis Jan 29, 2026
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16 changes: 16 additions & 0 deletions frame/thread/bli_thread.c
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Expand Up @@ -35,6 +35,22 @@

#include "blis.h"

// OpenMP 2.0 compatibility: Provide fallbacks for OpenMP 3.0 functions
// Some compilers (e.g., MSVC, older GCC) only support OpenMP 2.0 which lacks:
// - omp_get_active_level() (OpenMP 3.0)
// - omp_get_max_active_levels() (OpenMP 3.0)
// The _OPENMP macro is set to version-specific values by OpenMP-compliant compilers:
// 200203 = OpenMP 2.0, 200811 = OpenMP 3.0, 201107 = OpenMP 3.1, etc.
// Note: omp.h is already included by blis.h when BLIS_ENABLE_OPENMP is defined
#if defined(BLIS_ENABLE_OPENMP) && defined(_OPENMP) && _OPENMP < 200811
static inline int omp_get_active_level(void) {
return 0; // Always assume top-level (no nested parallelism support)
}
static inline int omp_get_max_active_levels(void) {
return 1; // OpenMP 2.0 doesn't support nested parallelism
}
#endif

thrinfo_t BLIS_PACKM_SINGLE_THREADED = {};
thrinfo_t BLIS_GEMM_SINGLE_THREADED = {};
thrcomm_t BLIS_SINGLE_COMM = {};
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