[Fix] mpt/check/compiler.hpp: Fix exception detection on Clang-cl and generic compilers.

git-svn-id: https://source.openmpt.org/svn/openmpt/trunk/OpenMPT@22963 56274372-70c3-4bfc-bfc3-4c3a0b034d27

Author: manxorist

src/mpt/check/compiler.hpp

@@ -47,11 +47,15 @@ MPT_WARNING("C++ compiler has no exception support.")
 MPT_WARNING("C++ compiler has no exception support.")
 #endif
 #elif MPT_COMPILER_CLANG
-#if (!defined(__EXCEPTIONS) || (__EXCEPTIONS != 1))
+#if (!__has_feature(cxx_exceptions) && (!defined(__EXCEPTIONS) || (__EXCEPTIONS != 1)) && !defined(_CPPUNWIND))
+MPT_WARNING("C++ compiler has no exception support.")
+#else
+#if (MPT_CXX_AT_LEAST(20) && !defined(__cpp_exceptions))
 MPT_WARNING("C++ compiler has no exception support.")
 #endif
 #endif
 #endif
+#endif
 
 #ifndef MPT_CHECK_CXX_IGNORE_WARNING_NO_RTTI
 #if MPT_COMPILER_MSVC