Build using clang (not clang-cl)

Signed-off-by: HS <hs@apotell.com>

Author: hs-apotell

runtime/Cpp/CMakeLists.txt

@@ -75,7 +75,7 @@ if(WITH_DEMO)
   endif()
 endif(WITH_DEMO)
 
-if(MSVC_VERSION)
+if("${CMAKE_CXX_COMPILER_ID}" MATCHES "MSVC")
   set(MY_CXX_WARNING_FLAGS "  /W4")
 else()
   set(MY_CXX_WARNING_FLAGS "  -Wall -pedantic -W")
@@ -102,7 +102,8 @@ else()
 endif()
 
 set(CMAKE_CXX_FLAGS                  "${CMAKE_CXX_FLAGS} ${MY_CXX_WARNING_FLAGS}")
-if(MSVC_VERSION)
+
+if("${CMAKE_CXX_COMPILER_ID}" MATCHES "MSVC")
   set(CMAKE_CXX_FLAGS_DEBUG          "${CMAKE_CXX_FLAGS_DEBUG} /Od /Zi /MP ${MY_CXX_WARNING_FLAGS}")
   set(CMAKE_CXX_FLAGS_MINSIZEREL     "${CMAKE_CXX_FLAGS_MINSIZEREL} /O1 /Oi /Ob2 /Gy /MP /DNDEBUG ${MY_CXX_WARNING_FLAGS}")
   set(CMAKE_CXX_FLAGS_RELEASE        "${CMAKE_CXX_FLAGS_RELEASE} /O2 /Oi /Ob2 /Gy /MP /DNDEBUG ${MY_CXX_WARNING_FLGAS}")

runtime/Cpp/runtime/CMakeLists.txt

@@ -87,12 +87,14 @@ set(extra_share_compile_flags "")
 set(extra_static_compile_flags "")
 set(static_lib_suffix "")
 
-if(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
+if (WIN32)
   set(static_lib_suffix "-static")
   target_compile_definitions(antlr4_shared PUBLIC ANTLR4CPP_EXPORTS)
   target_compile_definitions(antlr4_static PUBLIC ANTLR4CPP_STATIC)
-  set(extra_share_compile_flags "-MP /wd4251")
-  set(extra_static_compile_flags "-MP")
+  if("${CMAKE_CXX_COMPILER_ID}" MATCHES "MSVC")
+    set(extra_share_compile_flags "-MP /wd4251")
+    set(extra_static_compile_flags "-MP")
+  endif()
 endif()
 
 set_target_properties(antlr4_shared