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Kris Austin
0db1dc6480
For clang-cl, CMake sets the depfile flags to the gcc-style -MD, -MT and -MF, passed through as -clang: arguments. ccache does not parse those, so a cache hit writes only the object. Ninja has no depfile to read, so it records zero header dependencies for that object and does not rebuild it after a header edit. The stale object is still linked into the library and the DLL. sccache 0.15.0 reproduces the depfile on a hit and is unaffected. Use /showIncludes instead. CMake already does that for MSVC, and ccache reproduces it on a hit. A make-rules override sets the flags, because CMake includes the override after Platform/Windows-Clang.cmake. It is forwarded to each dependency because every one configures as its own CMake project, and it is only set when the file exists, because scripts/flatpak/make_deps_tar.sh packs deps/ alone. In a build with a warm cache, 678 of 790 objects had no recorded headers. Object code does not change. One GUI translation unit compiled both ways is byte-identical apart from the COFF timestamp.