Messages in this thread | | | Date | Thu, 21 Apr 2016 22:31:35 +0200 | From | Ralf Baechle <> | Subject | Re: [kbuild-all] mipsel-linux-gnu-gcc: error: unrecognized command line option '-mcompact-branches=optimal' |
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On Thu, Apr 21, 2016 at 12:51:29PM +0800, Fengguang Wu wrote:
> On Wed, Apr 20, 2016 at 03:30:21PM +0200, Ralf Baechle wrote: > > On Wed, Apr 20, 2016 at 01:44:28PM +0800, kbuild test robot wrote: > > > > > FYI, the error/warning still remains. > > > > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > > > head: 12566cc35d0e68308bde7aad615743d560cb097b > > > commit: c1a0e9bc885d46e519fd87d35af6a7937abfb986 MIPS: Allow compact branch policy to be changed > > > date: 6 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' > > > > -mcompact-branches=optimal is an option for the latest version of the MIPS > > architecture which is enabled by mips-malta_qemu_32r6_defconfig but your > > compiler is too old, doesn't support R6. Unfortunately there's no simple > > way to run a test on the build environment from kconfig or even before > > kconfig runs so we've just ignord this particular build issue. Plus > > there being the additional issue that we only know the toolchain to be > > used after certain options have been picked. > > We are running Debian's mips cross compiler. > > % mips-linux-gnu-gcc --version > mips-linux-gnu-gcc (Debian 5.2.1-16) 5.2.1 20150903 > Copyright (C) 2015 Free Software Foundation, Inc. > > How about temporarily disable that error, until we upgrade to a new > gcc version which supports the -mcompact-branches option?
Let's try to sort this properly :)
The culprit seems to be commit c1a0e9bc885d46e519fd87d35af6a7937abfb986 ("MIPS: Allow compact branch policy to be changed"). Paul, any reason why we don't offer the option of not using -mcompact-branches? It seems GCC 5.2 needs that.
Ralf
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