From: Peter Korsgaard <peter@korsgaard.com>
To: buildroot@busybox.net
Subject: [Buildroot] [PATCHv2] toolchain-wrapper: Disable -ftree-loop-distribute-patterns when building for microblaze with gcc >= 10
Date: Thu, 29 Oct 2020 23:26:21 +0100 [thread overview]
Message-ID: <87blgkfz3m.fsf@dell.be.48ers.dk> (raw)
In-Reply-To: <20201006202920.592493-1-romain.naour@gmail.com> (Romain Naour's message of "Tue, 6 Oct 2020 22:29:20 +0200")
>>>>> "Romain" == Romain Naour <romain.naour@gmail.com> writes:
> GCC 10 now enable by default -ftree-loop-distribute-patterns at -O2 or -Os
> optimization level instead of -O3, see commit [1].
> Due to this change, the microblaze kernel doesn't boot (as reported by
> toolchain-builder project).
> The gcc docs between version 9 and 10 has been updated accordingly [2] [3]
> but there no word about this change in the gcc 10 changelog [4].
> Fixes microblazebe:
> https://gitlab.com/bootlin/toolchains-builder/-/jobs/729359536 (glibc)
> https://gitlab.com/bootlin/toolchains-builder/-/jobs/729359538 (musl)
> https://gitlab.com/bootlin/toolchains-builder/-/jobs/729359540 (uClubc-ng)
> Fixes microblazeel:
> https://gitlab.com/bootlin/toolchains-builder/-/jobs/729359542 (glibc)
> https://gitlab.com/bootlin/toolchains-builder/-/jobs/729359544 (musl)
> https://gitlab.com/bootlin/toolchains-builder/-/jobs/729359546 (uClibc-ng)
> This has been reported upsteam [5].
> [1] https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=5879ab5fafedc8f6f9bfe95a4cf8501b0df90edd
> [2] https://gcc.gnu.org/onlinedocs/gcc-9.3.0/gcc/Optimize-Options.html#Optimize-Options
> [3] https://gcc.gnu.org/onlinedocs/gcc-10.2.0/gcc/Optimize-Options.html#Optimize-Options
> [4] https://gcc.gnu.org/gcc-10/changes.html
> [5] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97208
> Signed-off-by: Romain Naour <romain.naour@gmail.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> ---
> It's not clear if building the kernel with gcc 9 and -O3 trigger this issue.
> It has been noticed by the change from [1].
> v2: move -fno-tree-loop-distribute-patterns to the toolchain-wrapper (Arnout).
Committed to 2020.08.x, thanks.
--
Bye, Peter Korsgaard
prev parent reply other threads:[~2020-10-29 22:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-06 20:29 [Buildroot] [PATCHv2] toolchain-wrapper: Disable -ftree-loop-distribute-patterns when building for microblaze with gcc >= 10 Romain Naour
2020-10-25 9:49 ` Thomas Petazzoni
2020-10-29 22:26 ` Peter Korsgaard [this message]
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