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mipsel-linux-gnu-gcc: error: unrecognized command line option '-mcompact-branches=optimal'

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Hi Paul,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b562e44f507e863c6792946e4e1b1449fbbac85d
commit: c1a0e9bc885d46e519fd87d35af6a7937abfb986 MIPS: Allow compact branch policy to be changed
date:   5 months ago
config: mips-malta_qemu_32r6_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout c1a0e9bc885d46e519fd87d35af6a7937abfb986
        # save the attached .config to linux build tree
        make.cross ARCH=mips 

All errors (new ones prefixed by >>):

>> mipsel-linux-gnu-gcc: error: unrecognized command line option '-mcompact-branches=optimal'
>> mipsel-linux-gnu-gcc: error: unrecognized command line option '-mcompact-branches=optimal'
   make[2]: *** [kernel/bounds.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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mipsel-linux-gnu-gcc: error: unrecognized command line option  '-mcompact-branches=optimal' kbuild test robot <fengguang.wu@intel.com> - 2016-03-14 12:00 +0100

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