• Roman Zippel's avatar
    kconfig: fix .config dependencies · c955ccaf
    Roman Zippel authored
    
    
    This fixes one of the worst kbuild warts left - the broken dependencies used
    to check and regenerate the .config file.  This was done via an indirect
    dependency and the .config itself had an empty command, which can cause make
    not to reread the changed .config file.
    
    Instead of this we generate now a new file include/config/auto.conf from
    .config, which is used for kbuild and has the proper dependencies.  It's also
    the main make target now for all files generated during this step (and thus
    replaces include/linux/autoconf.h).
    
    This also means we can now relax the syntax requirements for the .config file
    and we don't have to rewrite it all the time, i.e.  silentoldconfig only
    writes .config now when it's necessary to keep it in sync with the Kconfig
    files and even this can be suppressed by setting the environment variable
    KCONFIG_NOSILENTUPDATE, so the update can (and must) be done manually.
    Signed-off-by: default avatarRoman Zippel <zippel@linux-m68k.org>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
    c955ccaf