Drop custom HAS_OPENMP define

Author: allnes

CMakeLists.txt

@@ -40,7 +40,6 @@ if(ITLABAI_ENABLE_OPENMP)
 
     if(OpenMP_FOUND)
         message(STATUS "OpenMP found - enabling parallel support")
-        add_definitions(-DHAS_OPENMP)
         link_libraries(OpenMP::OpenMP_CXX)
     else()
         message(STATUS "OpenMP not found - parallel features disabled")

include/parallel/backends.hpp

@@ -92,7 +92,7 @@ inline void impl_tbb(std::size_t count,
   }, oneapi::tbb::auto_partitioner());
 }
 
-#ifdef HAS_OPENMP
+#ifdef _OPENMP
 inline void impl_omp(std::size_t count,
                      const std::function<void(std::size_t)>& func,
                      const Options& opt) {

include/parallel/parallel.hpp

@@ -5,7 +5,7 @@ namespace it_lab_ai {
 namespace parallel {
 
 constexpr bool kHasOmp =
-#ifdef HAS_OPENMP
+#ifdef _OPENMP
     true;
 #else
     false;
@@ -16,7 +16,7 @@ inline Backend resolve_default_backend(std::size_t n, const Options& opt) {
     return Backend::kSeq;
   }
 
-#ifdef HAS_OPENMP
+#ifdef _OPENMP
   return Backend::kOmp;
 #else
   return Backend::kTbb;

include/perf/benchmarking.hpp

@@ -2,7 +2,7 @@
 
 #pragma once
 
-#if defined(HAS_OPENMP)
+#if defined(_OPENMP)
 #  include <omp.h>
 #endif
 
@@ -29,7 +29,7 @@ DurationContainerType elapsed_time(Function&& func, Args&&... args) {
 // returns time in seconds
 template <class Function, typename... Args>
 double elapsed_time_omp(Function&& func, Args&&... args) {
-#if defined(HAS_OPENMP)
+#if defined(_OPENMP)
   double start = omp_get_wtime();
   std::forward<Function>(func)(std::forward<Args>(args)...);
   double end = omp_get_wtime();
@@ -58,7 +58,7 @@ DurationContainerType elapsed_time_avg(const size_t iters, Function&& func,
 template <class Function, typename... Args>
 double elapsed_time_omp_avg(const size_t iters, Function&& func,
                             Args&&... args) {
-#if defined(HAS_OPENMP)
+#if defined(_OPENMP)
   double start = omp_get_wtime();
   for (size_t i = 0; i < iters; i++) {
     std::forward<Function>(func)(std::forward<Args>(args)...);