• Denis Efremov's avatar
    kbuild: add variables for compression tools · 8dfb61dc
    Denis Efremov authored
    Allow user to use alternative implementations of compression tools,
    such as pigz, pbzip2, pxz. For example, multi-threaded tools to
    speed up the build:
    $ make GZIP=pigz BZIP2=pbzip2
    
    Variables _GZIP, _BZIP2, _LZOP are used internally because original env
    vars are reserved by the tools. The use of GZIP in gzip tool is obsolete
    since 2015. However, alternative implementations (e.g., pigz) still rely
    on it. BZIP2, BZIP, LZOP vars are not obsolescent.
    
    The credit goes to @grsecurity.
    
    As a sidenote, for multi-threaded lzma, xz compression one can use:
    $ export XZ_OPT="--threads=0"
    Signed-off-by: default avatarDenis Efremov <efremov@linux.com>
    Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
    8dfb61dc
Makefile 60.8 KB