clang/gcc: Add build option FREECAD_WARN_ERROR to force to make warnings into errors

src/Mod/MeshPart/App/CMakeLists.txt

@@ -75,6 +75,9 @@ endif()
 
 add_library(MeshPart SHARED ${MeshPart_SRCS} ${MeshPart_Scripts})
 target_link_libraries(MeshPart ${MeshPart_LIBS})
+if (FREECAD_WARN_ERROR)
+    target_compile_warn_error(MeshPart)
+endif()
 
 
 fc_target_copy_resource_flat(MeshPart

src/Mod/MeshPart/Gui/CMakeLists.txt

@@ -81,6 +81,9 @@ endif(FREECAD_USE_PCH)
 
 add_library(MeshPartGui SHARED ${MeshPartGui_SRCS} ${MeshPartGui_Scripts} ${FLATMESH_PY_SRCS})
 target_link_libraries(MeshPartGui ${MeshPartGui_LIBS})
+if (FREECAD_WARN_ERROR)
+    target_compile_warn_error(MeshPartGui)
+endif()
 
 
 SET_BIN_DIR(MeshPartGui MeshPartGui /Mod/MeshPart)