• Linus Torvalds's avatar
    Kbuild: don't pass "-C" to preprocessor when processing linker scripts · 5cb0512c
    Linus Torvalds authored
    For some odd historical reason, we preprocessed the linker scripts with
    "-C", which keeps comments around.  That makes no sense, since the
    comments are not meaningful for the build anyway.
    
    And it actually breaks things, since linker scripts can't have C++ style
    "//" comments in them, so keeping comments after preprocessing now
    limits us in odd and surprising ways in our header files for no good
    reason.
    
    The -C option goes back to pre-git and pre-bitkeeper times, but seems to
    have been historically used (along with "-traditional") for some
    odd-ball architectures (ia64, MIPS and SH).  It probably didn't matter
    back then either, but might possibly have been used to minimize the
    difference between the original file and the pre-processed result.
    
    The reason for this may be lost in time, but let's not perpetuate it
    only because we can't remember why we did this crazy thing.
    
    This was triggered by the recent addition of SPDX lines to the source
    tree, where people apparently were confused about why header files
    couldn't use the C++ comment format.
    
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Greg KH <gregkh@linuxfoundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    5cb0512c
Makefile.build 19.3 KB