[Buildroot] blktrace fails to build on ARC

[Buildroot] blktrace fails to build on ARC

[Thomas Petazzoni]

Hello ARC maintainers,

I don't know if you have noticed, but the blktrace package fails to
build on ARC, since quite some time:

  http://autobuild.buildroot.net/?reason=blktrace-1.%

There is a toolchain issue:

/home/test/autobuild/run/instance-2/output/host/opt/ext-toolchain/bin/../lib/gcc/arc-buildroot-linux-uclibc/7.3.1/../../../../arc-buildroot-linux-uclibc/bin/ld: btreplay: hidden symbol `__st_r13_to_r17' in /home/test/autobuild/run/instance-2/output/host/opt/ext-toolchain/bin/../lib/gcc/arc-buildroot-linux-uclibc/7.3.1/libgcc.a(_millicodethunk_st.o) is referenced by DSO
/home/test/autobuild/run/instance-2/output/host/opt/ext-toolchain/bin/../lib/gcc/arc-buildroot-linux-uclibc/7.3.1/../../../../arc-buildroot-linux-uclibc/bin/ld: final link failed: Bad value

Could you have a look ?

Thanks,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

[Buildroot] [arc-buildroot] blktrace fails to build on ARC

[Evgeniy Didin]

Hello Thomas,

Recently due to a patch https://git.busybox.net/buildroot/commit/?id=5a3f78c9191595f7ea9fab49360dfc18a743d28b some packages were enabled for ARC. Four of them (blktrace, lvm2, gadgetfs-test and libioo) are building with error, which points to some issues with "millicode" optimizations in toolchain, which had not occurred before. Currently we are studying this problem.
 As a temporal solution until the issue is not resolved these packages can be disabled for ARC or millicode optimizations can be disabled for ARC by adding such lines in package/Makefile.in:
--------------------------8<-------------------------------
ifeq ($(BR2_arc),y)
TARGET_ABI += -mno-millicode
endif
-------------------------->8----------------------------
What  will be the best solution?

Best regards,
Evgeniy Didin


-----Original Message-----
From: Thomas Petazzoni <thomas.petazzoni@bootlin.com> 
Sent: Thursday, September 13, 2018 10:50 AM
To: ARC Maintainers <arc-buildroot@synopsys.com>
Cc: buildroot at uclibc.org
Subject: [arc-buildroot] blktrace fails to build on ARC

Hello ARC maintainers,

I don't know if you have noticed, but the blktrace package fails to build on ARC, since quite some time:

  https://urldefense.proofpoint.com/v2/url?u=http-3A__autobuild.buildroot.net_-3Freason-3Dblktrace-2D1.-25&d=DwICAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=Z74rKOsEpOUneCxYxwKcXHwrAmW8mJhNZjcWnDDJI2U&m=QoMrXipN4E4JiIRskedh0eBRDMLw3VGNAzwubPXFQkI&s=-Yyh3kuQOOLeUIZA9XJClvgv6cP0toOcYwlWmrAb7Y0&e=

There is a toolchain issue:

/home/test/autobuild/run/instance-2/output/host/opt/ext-toolchain/bin/../lib/gcc/arc-buildroot-linux-uclibc/7.3.1/../../../../arc-buildroot-linux-uclibc/bin/ld: btreplay: hidden symbol `__st_r13_to_r17' in /home/test/autobuild/run/instance-2/output/host/opt/ext-toolchain/bin/../lib/gcc/arc-buildroot-linux-uclibc/7.3.1/libgcc.a(_millicodethunk_st.o) is referenced by DSO
/home/test/autobuild/run/instance-2/output/host/opt/ext-toolchain/bin/../lib/gcc/arc-buildroot-linux-uclibc/7.3.1/../../../../arc-buildroot-linux-uclibc/bin/ld: final link failed: Bad value

Could you have a look ?

Thanks,

Thomas
--
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://urldefense.proofpoint.com/v2/url?u=https-3A__bootlin.com&d=DwICAg&c=DPL6_X_6JkXFx7AXWqB0tg&r=Z74rKOsEpOUneCxYxwKcXHwrAmW8mJhNZjcWnDDJI2U&m=QoMrXipN4E4JiIRskedh0eBRDMLw3VGNAzwubPXFQkI&s=7PBj283fg5GRuQvaF7uozmGFB0Ec3aup005s545sEow&e=

[Buildroot] [arc-buildroot] blktrace fails to build on ARC

[Thomas Petazzoni]

Hello Evgeniy,

On Sat, 15 Sep 2018 13:23:42 +0000, Evgeniy Didin wrote:

> Recently due to a patch
> https://git.busybox.net/buildroot/commit/?id=5a3f78c9191595f7ea9fab49360dfc18a743d28b
> some packages were enabled for ARC. Four of them (blktrace, lvm2,
> gadgetfs-test and libioo) are building with error, which points to
> some issues with "millicode" optimizations in toolchain, which had
> not occurred before. Currently we are studying this problem.

OK, thanks!

>  As a temporal solution until the issue is not resolved these
> packages can be disabled for ARC or millicode optimizations can be
> disabled for ARC by adding such lines in package/Makefile.in:
>
> --------------------------8<-------------------------------
> ifeq ($(BR2_arc),y)
> TARGET_ABI += -mno-millicode
> endif
> -------------------------->8----------------------------  
> What  will be the best solution?

Do we really want to pass -mno-millicode to all packages? If only four
packages are affected, what about adding this workaround to just those
four packages?

Also, will you remember to remove this workaround in the future when the
toolchain issue is fixed ? :-)

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com