mpopcnt just for cpp

Author: galabovaa

CMakeLists.txt

@@ -401,11 +401,12 @@ if (NOT HIGHS_COVERAGE AND NOT APPLE)
       check_cxx_compiler_flag("-mpopcntd" COMPILER_SUPPORTS_POPCNTD)
       if(COMPILER_SUPPORTS_POPCNTD)
           set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mpopcntd")
+          add_compile_options("$<$<COMPILE_LANGUAGE:CXX>:-mpopcntd>")
       endif()
   else()
       check_cxx_compiler_flag("-mpopcnt" COMPILER_SUPPORTS_POPCNT)
       if(COMPILER_SUPPORTS_POPCNT)
-          add_compile_options(-mpopcnt)
+          add_compile_options("$<$<COMPILE_LANGUAGE:CXX>:-mpopcnt>")
       endif()
   endif()
 endif()