Merge topic 'FindOpenMP-IntelLLVM-Windows' into release-3.20

6fd014a4b6 FindOpenMP: Use -Qiopenmp instead of -fiopenmp for IntelLLVM on Windows

Acked-by: Kitware Robot <[email protected]>
Merge-request: !5904

Modules/FindOpenMP.cmake

@@ -113,7 +113,12 @@ function(_OPENMP_FLAG_CANDIDATES LANG)
     else()
       set(OMP_FLAG_Intel "-qopenmp")
     endif()
-    set(OMP_FLAG_IntelLLVM "-fiopenmp")
+    if(CMAKE_${LANG}_COMPILER_ID STREQUAL "IntelLLVM" AND
+      "x${CMAKE_${LANG}_COMPILER_FRONTEND_VARIANT}" STREQUAL "xMSVC")
+      set(OMP_FLAG_IntelLLVM "-Qiopenmp")
+    else()
+      set(OMP_FLAG_IntelLLVM "-fiopenmp")
+    endif()
     set(OMP_FLAG_MSVC "-openmp")
     set(OMP_FLAG_PathScale "-openmp")
     set(OMP_FLAG_NAG "-openmp")