On Thursday 18 June 2015 12:40 PM, Geert Uytterhoeven wrote: > On Thu, Jun 18, 2015 at 8:47 AM, Vineet Gupta > <Vineet.Gupta1@xxxxxxxxxxxx> wrote: >> > commit a1c48bb160f8368 "Makefile: Fix unrecognized cross-compiler command line >> > options" moved ARCH specific cc option handling before common -Os/O2 setup. >> > >> > For ARC this had a subtle effect that we can no longer over-ride generic -O2 with >> > -O3, hence a performance regression observed going from 3.13 to 3.18 (the above >> > commit went into 3.16) >> > >> > I want to understand how to properly fix this. Moving the include of arch makefile >> > will bring back the old issue. I can introduce another option to set default optim >> > level, but only arc/m32r care about it anyways. > Can we include $(srctree)/arch/$(SRCARCH)/Makefile twice? Something like this would be ideal, but does that not bring back your warnings ? > > Or perhaps we can not apply the extra -O* if there's already a -O* option? Could be, but I'm not sure how to do that ? > Alternatively, as we already have CONFIG_CC_OPTIMIZE_FOR_SIZE, > a(nother) Kconfig option may make sense. I can cook this one - but is it really worth doing when only 2 arches care. Michal, do you have any opinion on how to solve this ? -Vineet -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
