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Date: Sat, 10 Feb 2018 21:00:02 -0500
From: Kevin Easton <kevin@guarana.org>
Subject: Re: [RFC PATCH 4/7] kconfig: support new special property shell=
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To: Randy Dunlap <rdunlap@infradead.org>
Cc: Ulf Magnusson <ulfalizer@gmail.com>, Masahiro Yamada <yamada.masahiro@socionext.com>, Kees Cook <keescook@chromium.org>, Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>, Linus Torvalds <torvalds@linux-foundation.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Andrew Morton <akpm@linux-foundation.org>, Nicolas Pitre <nicolas.pitre@linaro.org>, "Luis R . Rodriguez" <mcgrof@suse.com>, Sam Ravnborg <sam@ravnborg.org>, Michal Marek <michal.lkml@markovi.net>, Martin Schwidefsky <schwidefsky@de.ibm.com>, Pavel Machek <pavel@ucw.cz>, linux-s390 <linux-s390@vger.kernel.org>, Jiri Kosina <jkosina@suse.cz>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Sat, Feb 10, 2018 at 10:05:12AM -0800, Randy Dunlap wrote:
> On 02/10/2018 12:55 AM, Ulf Magnusson wrote:
> > How many compilers don't support -fno-stack-protector by the way?
> > 
> > 	config CC_HAS_STACKPROTECTOR_STRONG
> > 		bool
> > 		option shell="$CC -Werror -fstack-protector-strong -c -x c /dev/null"
> > 	
> > 	config CC_HAS_STACKPROTECTOR_REGULAR
> > 		bool
> > 		option shell="$CC -Werror -fstack-protector -c -x c /dev/null"
> > 	
> > 	config CC_HAS_STACKPROTECTOR_NONE
> > 		bool
> > 		default y
> > 		option shell="$CC -Werror -fno-stack-protector -c -x c /dev/null"
> 
> I ran:
> gcc -Werror -fno-stack-protector -c -x c /dev/null
> 
> It worked (gcc (SUSE Linux) 4.8.5) but it did leave a null.o file for me.
> Might need to add that to 'make clean' or just rm it immediately.

gcc -Werror -fno-stack-protector -c -x c /dev/null -o /dev/null

seems to DTRT without leaving anything behind.

    - Kevin