early exit.

Author: trivialfis

cmake/FindOpenMPMacOS.cmake

@@ -3,11 +3,25 @@
 
 # lint_cmake: -package/consistency
 
+function(_is_clang result_out)
+  if (${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
+    set(${result_out} TRUE PARENT_SCOPE)
+  else()
+    set(${result_out} FALSE PARENT_SCOPE)
+  endif()
+endfunction()
+
 macro(find_openmp_macos)
   if(NOT APPLE)
     message(FATAL_ERROR "${CMAKE_CURRENT_FUNCTION}() must only be used on MacOS")
   endif()
 
+  _is_clang(_using_clang)
+  if(NOT _using_clang)
+    find_package(OpenMP REQUIRED C CXX)
+    return()
+  endif()
+
   if(NOT BUILD_WITH_SHARED_OPENMP)
     execute_process(COMMAND brew --prefix libomp
       OUTPUT_VARIABLE HOMEBREW_LIBOMP_PREFIX