gcc, clang: preprocess multi-arch compilations once per -arch - #2871

gcc, clang: preprocess multi-arch compilations once per -arch#2871

sylvestre merged 5 commits into

mozilla:mainmozilla/sccache:mainfrom

francoisgirinon-netizen:fix/multiarch-per-arch-preprocessfrancoisgirinon-netizen/sccache:fix/multiarch-per-arch-preprocessCopy head branch name to clipboard