port to MSYS2/clang

src/Mod/Path/App/CMakeLists.txt

@@ -145,6 +145,15 @@ target_link_libraries(Path ${Path_LIBS})
 if(NOT ${Boost_VERSION} LESS 107500)
     set_target_properties(Path PROPERTIES CXX_STANDARD_REQUIRED ON)
     set_target_properties(Path PROPERTIES CXX_STANDARD 14)
+
+    # Suppress -Wc++17-extensions when using  OCCT 7.5 or newer
+    if (MINGW AND CMAKE_COMPILER_IS_CLANGXX)
+        unset(_flag_found CACHE)
+        check_cxx_compiler_flag("-Wno-c++17-extensions" _flag_found)
+        if (_flag_found)
+            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-c++17-extensions")
+        endif()
+    endif()
 endif()
 
 if(FREECAD_USE_PCH)

src/Mod/Path/libarea/kurve/geometry.h

@@ -10,7 +10,7 @@
 //
 /////////////////////////////////////////////////////////////////////////////////////////
 #pragma once
-#ifdef WIN32
+#ifdef _MSC_VER
 #pragma warning( disable : 4996 )
 #ifndef WINVER
 	#define WINVER 0x501
@@ -772,7 +772,7 @@ inline bool FNEZ(double a, double tolerance = TIGHT_TOLERANCE) {return fabs(a) >
 
 
 
-#ifdef WIN32
+#ifdef _MSC_VER
 #pragma warning(disable:4522)
 #endif
 
@@ -902,7 +902,7 @@ inline bool FNEZ(double a, double tolerance = TIGHT_TOLERANCE) {return fabs(a) >
 		PK_BODY_t ToPKlofted_thickened_body(Kurve &sec, double thickness);
 #endif
 	};
-#ifdef WIN32
+#ifdef _MSC_VER
 #pragma warning(default:4522)
 #endif