Commit 04bcc910e914b75fcebebf11c3b09d065673af8a
2022-10-29T03:14:54
cmake: don't do enable_language(OBJC) When SDL is included as a subproject, the following error might appear: ``` CMake Error: Error required internal CMake variable not set, cmake may not be built correctly. Missing variable is: CMAKE_OBJC_COMPILE_OBJECT ``` This is probably because the master project does not see certain OBJC related variables
diff --git a/cmake/macros.cmake b/cmake/macros.cmake
index 267a8af..5830fce 100644
--- a/cmake/macros.cmake
+++ b/cmake/macros.cmake
@@ -92,7 +92,11 @@ macro(LISTTOSTRREV _LIST _OUTPUT)
endforeach()
endmacro()
-if(${CMAKE_VERSION} VERSION_LESS "3.16.0")
+if(CMAKE_VERSION VERSION_LESS 3.16.0 OR SDL2_SUBPROJECT)
+ # - CMake versions <3.16 do not support the OBJC language
+ # - When SDL is built as a subproject and when the main project does not enable OBJC,
+ # CMake fails due to missing internal CMake variables (CMAKE_OBJC_COMPILE_OBJECT)
+ # (reproduced with CMake 3.24.2)
macro(CHECK_OBJC_SOURCE_COMPILES SOURCE VAR)
set(PREV_REQUIRED_DEFS "${CMAKE_REQUIRED_DEFINITIONS}")
set(CMAKE_REQUIRED_DEFINITIONS "-x objective-c ${PREV_REQUIRED_DEFS}")