tinyxml2/CMakeLists.txt: disabled some Clang compiler warnings

Author: firewave

externals/tinyxml2/CMakeLists.txt

@@ -15,6 +15,8 @@ if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     target_compile_options_safe(tinyxml2 -Wno-zero-as-null-pointer-constant)
     target_compile_options_safe(tinyxml2 -Wno-format-nonliteral)
     target_compile_options_safe(tinyxml2 -Wno-inconsistent-missing-destructor-override)
+    target_compile_options_safe(tinyxml2 -Wno-sign-conversion)
+    target_compile_options_safe(tinyxml2 -Wno-double-promotion)
 endif()
 if(CYGWIN)
     target_compile_definitions(-D_LARGEFILE_SOURCE)  # required for fseeko() and ftello()