On Wed, 24 Aug 2016 17:01:30 +0200 Arnd Bergmann <arnd@xxxxxxxx> wrote: > On Wednesday, August 24, 2016 8:56:46 PM CEST Nicholas Piggin wrote: > > On Wed, 24 Aug 2016 19:05:30 +1000 > > Nicholas Piggin <npiggin@xxxxxxxxx> wrote: > > > Thanks, I'll take a look. > > > > Okay, I can't reproduce your bad linking times even with gc-sections. It's > > possible I'm doing something wrong, but with my patches + your patch and > > standard arm allyesconfig: > > > > 20:33:56 AR built-in.o > > 20:33:57 LD vmlinux.o > > MODPOST vmlinux.o > > 20:34:12 GEN .version > > CHK include/generated/compile.h > > UPD include/generated/compile.h > > CC init/version.o > > AR init/built-in.o > > 20:34:24 KSYM .tmp_kallsyms1.o > > 20:34:45 KSYM .tmp_kallsyms2.o > > 20:34:54 LD vmlinux > > 20:35:07 SORTEX vmlinux > > 20:35:07 SYSMAP System.map > > > > I have about 71 seconds for the final link phase. > > > I've tracked down my remaining build time regression to > a bad binutils snapshot (2.26.51) I had been using, and upgraded > to the 2.27 release now, which is roughly the same as what > you have: > > 14:45:41 LINK vmlinux > 14:45:41 AR built-in.o > 14:45:42 LD vmlinux.o > 14:51:49 MODPOST vmlinux.o > 14:51:51 GEN .version > 14:51:51 CHK include/generated/compile.h > UPD include/generated/compile.h > 14:51:51 CC init/version.o > 14:51:52 AR init/built-in.o > 14:52:04 KSYM .tmp_kallsyms1.o > 14:52:31 KSYM .tmp_kallsyms2.o > 14:52:43 LD vmlinux > 14:52:55 SORTEX vmlinux > 14:52:55 SYSMAP System.map > 14:52:56 OBJCOPY arch/arm/boot/Image > > The long minutes that were spent in "arm-linux-gnueabi-ld > -r -o vmlinux.o --whole-archive built-in.o" are all gone now. Thanks for tracking it down, that's good to hear. > I still see a problem with big-endian builds failing with > thinarc/gc-sections, I'll investigate that some other day, > or you could have a look at that if you want to make sure > it's an ARM specific problem, not something with your > patches in general. > > The patch that I sent for enabling the two on ARM blocks > out CONFIG_CPU_BIG_ENDIAN, so just revert that hunk to see > the problem. It's possible that it only breaks when doing > a big-endian build after a little-endian build without > a "make clean" inbetween. I'm able to build big endian ARM allyesconfig with thin archives and gc-sections, worked fine. There have been a few bugs in powerpc when failing to notice the change when endian of builds was swapped, so maybe you got bitten by something similar. Thanks, Nick -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
