linux-kernel - Re: mmotm 2014-07-02-15-07 uploaded (stack protector)

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Date:	Wed, 02 Jul 2014 16:21:06 -0700
From:	Randy Dunlap <rdunlap@...radead.org>
To:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-next@...r.kernel.org, sfr@...b.auug.org.au, mhocko@...e.cz,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: mmotm 2014-07-02-15-07 uploaded (stack protector)

On 07/02/14 15:08, akpm@...ux-foundation.org wrote:
> The mm-of-the-moment snapshot 2014-07-02-15-07 has been uploaded to
> 
>    http://www.ozlabs.org/~akpm/mmotm/
> 
> mmotm-readme.txt says
> 
> README for mm-of-the-moment:
> 
> http://www.ozlabs.org/~akpm/mmotm/
> 
> This is a snapshot of my -mm patch queue.  Uploaded at random hopefully
> more than once a week.

Hi Andi,

Here is an extract from 10 randconfig builds:


$ grep STACKPROTECTOR_STRONG config-r*
config-r8735:CONFIG_CC_STACKPROTECTOR_STRONG=y
config-r8736:CONFIG_CC_STACKPROTECTOR_STRONG=y
config-r8737:# CONFIG_CC_STACKPROTECTOR_STRONG is not set
config-r8738:# CONFIG_CC_STACKPROTECTOR_STRONG is not set
config-r8739:CONFIG_CC_STACKPROTECTOR_STRONG=y
config-r8740:CONFIG_CC_STACKPROTECTOR_STRONG=y
config-r8741:CONFIG_CC_STACKPROTECTOR_STRONG=y
config-r8742:# CONFIG_CC_STACKPROTECTOR_STRONG is not set
config-r8743:# CONFIG_CC_STACKPROTECTOR_STRONG is not set
config-r8744:# CONFIG_CC_STACKPROTECTOR_STRONG is not set


but the captured output for each one says:

grep STACKPROTECTOR_STRONG  build*.out
build-r8735.out:/local/lnx/MM/mmotm-2014-0702-1507/Makefile:662: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler
build-r8736.out:/local/lnx/MM/mmotm-2014-0702-1507/Makefile:662: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler
build-r8736.out:/local/lnx/MM/mmotm-2014-0702-1507/Makefile:662: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler
build-r8737.out:/local/lnx/MM/mmotm-2014-0702-1507/Makefile:662: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler
build-r8739.out:/local/lnx/MM/mmotm-2014-0702-1507/Makefile:662: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler
build-r8740.out:/local/lnx/MM/mmotm-2014-0702-1507/Makefile:662: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler
build-r8740.out:/local/lnx/MM/mmotm-2014-0702-1507/Makefile:662: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler
build-r8741.out:/local/lnx/MM/mmotm-2014-0702-1507/Makefile:662: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler
build-r8741.out:/local/lnx/MM/mmotm-2014-0702-1507/Makefile:662: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler
build-r8742.out:/local/lnx/MM/mmotm-2014-0702-1507/Makefile:662: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler


then the build goes on to produce many errors like this one:

  CC      init/do_mounts.o
gcc: error: unrecognized command line option '-fstack-protector-strong'


Can you explain this, please?  or even better yet, fix it.

thanks,

-- 
~Randy
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