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  • Masahiro Yamada's avatar
    kbuild: create directory for make cache only when necessary · 9a234a2e
    Masahiro Yamada authored
    
    
    Currently, the existence of $(dir $(make-cache)) is always checked,
    and created if it is missing.
    
    We can avoid unnecessary system calls by some tricks.
    
    [1] If KBUILD_SRC is unset, we are building in the source tree.
        The output directory checks can be entirely skipped.
    [2] If at least one cache data is found, it means the cache file
        was included.  Obviously its directory exists.  Skip "mkdir -p".
    [3] If Makefile does not contain any call of __run-and-store, it will
        not create a cache file.  No need to create its directory.
    [4] The "mkdir -p" should be only invoked by the first call of
        __run-and-store
    
    Signed-off-by: Masahiro Yamada's avatarMasahiro Yamada <yamada.masahiro@socionext.com>
    Reviewed-by: default avatarDouglas Anderson <dianders@chromium.org>
    9a234a2e