A recent thread on the Ninja list mentioned `-gsplit-dwarf` to help cut down on link times and memory use. I suspect this would be useful for many projects (not just the likes of e.g. LLVM), but it would be beneficial if CMake had native support: - It shouldn't be added to `CMAKE_CXX_FLAGS` because then `Release` builds also get debug information. - It's a pain to add to `CMAKE_CXX_FLAGS_{DEBUG,RELWITHDEBINFO}` because at least `CMAKE_CXX_FLAGS_RELWITHDEBINFO` needs other flags as well; users must configure, then go back and modify the flags variables or else try to specify all the flags (and hope the defaults don't change). - It "breaks" clean builds and installs because CMake doesn't know about `.dwo` files. All these would be fixed by "native" support. We have precedent for supporting similar compiler features, e.g. PIC.