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    kbuild: revert "save ARCH & CROSS_COMPILE ..." · 2331d1a6
    Sam Ravnborg authored
    Revert commit 57554334
    
    
    
    It caused following issues:
    
    - On architectures where ARCH= setting is used to select between
      32 and 64 bit this was no longer possible without "make mrproper"
    - If ARCH was changed then kbuild refused to run "make mrproper"
      because ARCH had changed
    - When CROSS_COMPILE was changed people were asked to run "make mrproper"
      but kbuild refused to run "make mrproper" because CROSS_COMPILE changed.
    - Spaces in CROSS_COMPILE was not 'supported'
    - If an non-existing ARCH= was used kbuild could get stuck
    
    Lessons learned:
    . Despite being simple and straghtforward people uses very different
      approaches when building the kernel.
    
    . CROSS_COMPILE is sometimes used for ccache despite cache being
      only a CC frontend so one would have expected CC to be
      used for this purpose.
    
    . And obviously this was not tested widely enough.
    
    Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
    Cc: Pavel Machek <pavel@ucw.cz>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    2331d1a6