[PATCH] powerpc: Fix stackprotector detection for non-glibc toolchains

[Michael Ellerman]

Segher Boessenkool <segher at kernel.crashing.org> writes:
> On Sat, Oct 13, 2018 at 10:55:01PM +1100, Michael Ellerman wrote:
>> So it's only my cross compilers that don't work.
>> 
>> The kernel.org ones are:
>>   Configured with: /home/arnd/git/gcc/configure --target=powerpc64-linux
>>   --enable-targets=all
>>   --prefix=/home/arnd/cross/x86_64/gcc-8.1.0-nolibc/powerpc64-linux
>>   --enable-languages=c --without-headers --disable-bootstrap
>>   --disable-nls --disable-threads --disable-shared --disable-libmudflap
>>   --disable-libssp --disable-libgomp --disable-decimal-float
>>   --disable-libquadmath --disable-libatomic --disable-libcc1
>>   --disable-libmpx --enable-checking=release
>> 
>> Whereas mine is:
>>   Configured with: ../../src/gcc/configure
>>   --prefix=/home/kerkins/workspace/gcc-build/gcc/gcc-8-branch/target/ppc/build/install/powerpc-linux
>>   --disable-multilib --disable-bootstrap --enable-languages=c
>>   --with-pkgversion='Custom 2c79ff811dfcee1c' --target=powerpc-linux
>>   --enable-targets=all
>> 
>> 
>> So I wonder if something in there is making the difference?
>
> You have --disable-libssp on the buildall-built compiler, which makes GCC
> assume your libc has the SSP support routines, which gives you these default
> offsets (which are what they are on glibc).  Never mind that you explicitly
> do not have a libc ;-)

OK thanks, things just get weirder and weirder :)

>> I guess I'll just rewrite the change log to say "some toolchains".
>
> Or "most".

As it happens I forgot to update the change log anyway :/

Oh well.

cheers