I want to compile a target that contains some Objective-C files and some Objective-C++ files (conventionally ending in .mm). For the latter, I want to specify -std=c++11. If I add that to objccopts, my Objective-C++ files compile, but clang dies on my Objective-C files with:

error: invalid argument '-std=c++11' not allowed with 'C/ObjC'