On Mon, Jun 22, 2020 at 12:37:12PM -0700, Andy Lutomirski wrote:
> It’s this whole mess:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383
It really is a mess because our option detection doesn't really work. I did:
ifdef CONFIG_CC_IS_GCC
ifeq ($(call cc-option-yn,-mpreferred-stack-boundary=3),y)
dummy := $(error "gcc supports -mpreferred-stack-boundary=3")
endif
...
and doing:
$ make CC=gcc-4.8 HOSTCC=gcc-4.8 V=1 lib/test_fpu.ko
gives
lib/Makefile:110: *** "gcc supports -mpreferred-stack-boundary=3". Stop.
That same compiler, however, says:
$ gcc-4.8 -mpreferred-stack-boundary=3 -c /tmp/foo.c
/tmp/foo.c:1:0: error: -mpreferred-stack-boundary=3 is not between 4 and 12
so I need to dig deep into cc-option* fun.
Or, I can be lazy and simply cut off all compiler versions to >= 8
and be done with it. If people wanna run selftests, they can upgrade
toolchain too...
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
