Use WIN32 AND NOT MINGW to detect the "native" Windows ABI

CMakeLists.txt

@@ -113,12 +113,12 @@ set(libBlocksRuntime_COMPATIBILITY_HDRS
 set(libobjc_CXX_SRCS
 	selector_table.cc
 	)
-# Windows does not use DWARF EH
-if (MSVC)
+# Windows does not use DWARF EH, except when using the GNU ABI (MinGW)
+if (WIN32 AND NOT MINGW)
 	list(APPEND libobjc_CXX_SRCS eh_win32_msvc.cc)
 else ()
 	list(APPEND libobjc_C_SRCS eh_personality.c)
-endif (MSVC)
+endif (WIN32 AND NOT MINGW)
 
 if (NOT EXISTS "${CMAKE_SOURCE_DIR}/third_party/robin-map/include/tsl/robin_map.h")
 	message(FATAL_ERROR "Git submodules not present, please run:\n\n"
@@ -129,7 +129,7 @@ if (NOT EXISTS "${CMAKE_SOURCE_DIR}/third_party/robin-map/include/tsl/robin_map.
 endif ()
 
 
-if (MSVC)
+if (WIN32 AND NOT MINGW)
 	set(OLD_ABI_COMPAT_DEFAULT false)
 else()
 	set(OLD_ABI_COMPAT_DEFAULT true)
@@ -186,7 +186,7 @@ if(WIN32)
 endif()
 
 
-if (MSVC)
+if (WIN32 AND NOT MINGW)
 	set(ASSEMBLER ${CMAKE_ASM_COMPILER} CACHE STRING "Assembler to use with Visual Studio (must be gcc / clang!)")
 	message(STATUS "Using custom build commands to work around CMake bugs")
 	message(STATUS "ASM compiler: ${ASSEMBLER}")
@@ -207,7 +207,7 @@ endif()
 
 
 
-if (MSVC)
+if (WIN32 AND NOT MINGW)
 	message(STATUS "Using MSVC-compatible exception model")
 else ()
 	separate_arguments(EH_PERSONALITY_FLAGS NATIVE_COMMAND ${CMAKE_CXX_FLAGS})
@@ -231,7 +231,7 @@ target_sources(objc PRIVATE ${libobjc_CXX_SRCS})
 include(FindThreads)
 target_link_libraries(objc Threads::Threads)
 # Link against ntdll.dll for RtlRaiseException
-if (MSVC)
+if (WIN32 AND NOT MINGW)
 	target_link_libraries(objc ntdll.dll)
 endif()