On Friday 18 March 2016 03:59 PM, Arnd Bergmann wrote: > On Friday 18 March 2016 15:50:11 Vineet Gupta wrote: >> Sure, but I prefer this to be only for gcc 4.8 as this warning seems to be >> healthy in small doses At least it keeps the door open for future discussion >> with gcc guys ! > > FWIW, testing on ARM with gcc-6.0 -O3, I also get tons of maybe-uninitialized > warnings. It's unlikely that this is architecture specific or fixed in newer > compiler versions. So we disable this for good just like -Os. What a shame - seemed like a reasonable safety net for programming errors. >> The following nested construct actually works - does that look OK to you ? >> >> ARCH_CFLAGS += -O3 $(call cc-ifversion, -lt, 0408, $(call cc-disable-warning,maybe-uninitialized,)) > > Yes, that seems ok. There was typo actually -lt needed to be -eq > I don't really understand why -O3 is needed though, maybe it's better to > assume that it won't be needed in future gcc versions and do Not sure what you mean, -O3 for triggering the warnings or -O3 in ARC makefile at all. Assuming it's latter, this is how its been forever and was added consciously as performance seemed better with -O3 than the default -O2. > > ARCH_CFLAGS += $(call cc-ifversion, -lt, 0408, -O3 $(call cc-disable-warning,maybe-uninitialized,)) > > Arnd > -- > To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in > the body of a message to majordomo at vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >
