Re: [OE-core] [RFT] GCC 8.1

[Martin Jansa <martin.jansa@gmail.com>]

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On Thu, May 10, 2018 at 12:27:50PM -0700, Andre McCurdy wrote:
> On Thu, May 10, 2018 at 12:11 PM, Martin Jansa <martin.jansa@gmail.com> wrote:
> > On Thu, May 10, 2018 at 11:50:02AM -0700, Khem Raj wrote:
> >> Hi Martin
> >>
> >> Thanks for testing and reporting back
> >>
> >> On 5/9/18 2:38 AM, Martin Jansa wrote:
> >> > My initial tests show couple issues, but usually caused by other changes
> >> > in that branch, not the gcc-8 itself.
> >> >
> >> > 1) strace-4.22 from
> >> > http://git.openembedded.org/openembedded-core-contrib/commit/?h=kraj/gcc-8&id=af33a8b721cc9caebd3f5226b4c5903f666ab654
> >> > fails to build with ptest enabled (it builds with 4.20 version if I
> >> > revert this change)
> >> > ../../strace-4.22/tests/inject-nf.c: In function 'main':
> >> > ../../strace-4.22/tests/inject-nf.c:86:1: error: r7 cannot be used in
> >> > asm here
> >> >   }
> >> >   ^
> >>
> >> are you targeting thumb1 ? how can I reproduce it ?
> >
> > I'm trying to find out what's different in the builds where it was
> > failing, will provide more info later.
> 
> This is probably due to making an inline syscall from Thumb (doesn't a
> matter Thumb1 or Thumb2) with frame pointers enabled.
> 
> Does adding -fomit-frame-pointer to CFLAGS fix it?

It was with raspberrypi3, thumb (Thumb2) enabled in DISTRO, there is
already -fno-omit-frame-pointer in the default command line for it,
adding -fomit-frame-pointer at the end fixes it:

docker-lge @ ~/build/build-webos-master/BUILD/work/raspberrypi3-webos-linux-gnueabi/strace/4.22-r0/build/tests $ arm-webos-linux-gnueabi-gcc  -march=armv7ve -mthumb -mfpu=neon-vfpv4 -mfloat-abi=hard -mcpu=cortex-a7 --sysroot=/OE/webos/build/build-webos-master/BUILD/work/raspberrypi3-webos-linux-gnueabi/strace/4.22-r0/recipe-sysroot -DHAVE_CONFIG_H    -I. -I../linux/arm -I../../strace-4.22/linux/arm -I../linux -I../../strace-4.22/linux -I.. -I../../strace-4.22 -DTESTS_SIZEOF_KERNEL_LONG_T=4 -DTESTS_SIZEOF_LONG=4  -Wall -Wempty-body -Wformat-security -Wignored-qualifiers -Wimplicit-fallthrough=5 -Winit-self -Wlogical-op -Wmissing-parameter-type -Wnested-externs -Wold-style-declaration -Wold-style-definition -Wsign-compare -Wtype-limits -Wwrite-strings -O -fno-omit-frame-pointer -g -feliminate-unused-debug-types -fdebug-prefix-map=/OE/webos/build/build-webos-master/BUILD/work/raspberrypi3-webos-linux-gnueabi/strace/4.22-r0=/usr/src/debug/strace/4.22-r0 -fdebug-prefix-map=/OE/webos/build/build-webos-master/BUILD/work/raspberrypi3-webos-linux-gnueabi/strace/4.22-r0/recipe-sysroot= -fdebug-prefix-map=/OE/webos/build/build-webos-master/BUILD/work/raspberrypi3-webos-linux-gnueabi/strace/4.22-r0/recipe-sysroot-native=  -pipe  -c -o inject-nf.o ../../strace-4.22/tests/inject-nf.c -fomit-frame-pointer

This might come from:
meta/conf/bitbake.conf:DEBUG_OPTIMIZATION = "-O -fno-omit-frame-pointer ${DEBUG_FLAGS} -pipe"
because in this build I had DEBUG_BUILD enabled.

Will retest with 4.20 version + DEBUG_BUILD to see if it fails there as well now.

Thanks for pointers.

-- 
Martin 'JaMa' Jansa     jabber: Martin.Jansa@gmail.com

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