Overriding -fiopenmp and -Qiopenmp with -fopenmp and -Qopenmp (#978)

Overriding  -fiopenmp with -fopenmp in cmake

The same with /Qiopenmp and /Qopenmp.  Due to minor correctness issues, reverting back to using -fopenmp and /Qopenmp for current versions of the icx/icpx compiler.

Signed-off-by: Dan Hoeflinger <[email protected]>

Author: danhoeflinger

CMakeLists.txt

@@ -288,7 +288,20 @@ elseif(ONEDPL_BACKEND MATCHES "^(omp)$")
     find_package(OpenMP)
     if (OpenMP_CXX_FOUND)
         message(STATUS "Compilation for the host due to OpenMP backend.")
-        target_link_libraries(oneDPL INTERFACE OpenMP::OpenMP_CXX)
+        # Due to minor correctness issues with -fiopenmp / -Qiopenmp, we are using -fopenmp / -Qopenmp until they are corrected.
+        # Once correctness issues are resolved, we will limit this workaround to affected versions of specific compilers.
+        if (OpenMP_CXX_FLAGS MATCHES ".*-fiopenmp.*")
+            set(_openmp_flag -fopenmp)
+        elseif (OpenMP_CXX_FLAGS MATCHES ".*[-/]Qiopenmp.*")
+            set(_openmp_flag /Qopenmp)
+        endif()
+        if (_openmp_flag)
+            message(STATUS "Using ${_openmp_flag} for openMP")
+            target_compile_options(oneDPL INTERFACE ${_openmp_flag})
+            target_link_libraries(oneDPL INTERFACE ${_openmp_flag})
+        else()
+            target_link_libraries(oneDPL INTERFACE OpenMP::OpenMP_CXX)
+        endif()
         target_compile_definitions(oneDPL INTERFACE
             ONEDPL_USE_TBB_BACKEND=0
             ONEDPL_USE_DPCPP_BACKEND=0

cmake/templates/oneDPLConfig.cmake.in

@@ -82,7 +82,20 @@ if (EXISTS "${_onedpl_headers}")
             elseif (OpenMP_CXX_FOUND)
                 set(ONEDPL_PAR_BACKEND openmp)
                 message(STATUS "oneDPL: ONEDPL_PAR_BACKEND=${ONEDPL_PAR_BACKEND}, disable oneTBB backend")
-                set_target_properties(oneDPL PROPERTIES INTERFACE_LINK_LIBRARIES OpenMP::OpenMP_CXX)
+                # Due to minor correctness issues with -fiopenmp / -Qiopenmp, we are using -fopenmp / -Qopenmp until they are corrected.
+                # Once correctness issues are resolved, we will limit this workaround to affected versions of specific compilers.
+                if (OpenMP_CXX_FLAGS MATCHES ".*-fiopenmp.*")
+                    set(_openmp_flag -fopenmp)
+                elseif (OpenMP_CXX_FLAGS MATCHES ".*[-/]Qiopenmp.*")
+                    set(_openmp_flag /Qopenmp)
+                endif()
+                if (_openmp_flag)
+                    message(STATUS "oneDPL: Using ${_openmp_flag} for openMP")
+                    set_target_properties(oneDPL PROPERTIES INTERFACE_COMPILE_OPTIONS ${_openmp_flag})
+                    set_target_properties(oneDPL PROPERTIES INTERFACE_LINK_LIBRARIES ${_openmp_flag})
+                else()
+                    set_target_properties(oneDPL PROPERTIES INTERFACE_LINK_LIBRARIES OpenMP::OpenMP_CXX)
+                endif()
                 set_property(TARGET oneDPL APPEND PROPERTY INTERFACE_COMPILE_DEFINITIONS ONEDPL_USE_TBB_BACKEND=0 ONEDPL_USE_OPENMP_BACKEND=1)
             endif()
         endif()