[Buildroot] [PATCH v3 1/1] qemu: add patch to fix SSP support detection

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Dear Rodrigo Rebello,

On Mon, 16 Nov 2015 08:58:18 -0200, Rodrigo Rebello wrote:
> The QEMU configure script incorrectly assumes SSP is supported by the
> toolchain in some cases where the compiler accepts -fstack-protector*
> flags but the C library does not provide the necessary __stack_chk_*()
> functions.
> 
> Even though a full compile and link test is performed by the script,
> this is done with a code fragment which does not actually meet any of
> the conditions required to cause the compiler to emit canary code when
> the -fstack-protector-strong variant is used. As no compile or link
> failure occurs in this case, a false positive is generated and a
> subsequent error is seen when the probe for pthreads is performed.
> 
> The fix consists in patching the configure script to use a more
> appropriate test program for the SSP support checks.
> 
> Fixes:
> 
>   http://autobuild.buildroot.net/results/efb/efbb4e940543894b8745bb405478a096c90a5ae2/
>   http://autobuild.buildroot.net/results/32d/32d6d984febad2dee1f0d31c5fa0aea823297096/
>   http://autobuild.buildroot.net/results/aa6/aa6e71c957fb6f07e7bded35a8e47be4dadd042c/
>   ...and many others.
> 
> Signed-off-by: Rodrigo Rebello <rprebello@gmail.com>
> ---
> Changes v2 -> v3:
>   - Use a better test code fragment that works when LTO is enabled

Applied to master, thanks.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com