From mboxrd@z Thu Jan 1 00:00:00 1970 From: Romain Naour Date: Sat, 26 Sep 2020 21:13:30 +0200 Subject: [Buildroot] [PATCH 2/2] linux: Disable -ftree-loop-distribute-patterns when building for microblaze with gcc >= 10 In-Reply-To: <20200926191330.96074-1-romain.naour@gmail.com> References: <20200926191330.96074-1-romain.naour@gmail.com> Message-ID: <20200926191330.96074-2-romain.naour@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net 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 Cc: Thomas Petazzoni --- linux/linux.mk | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/linux/linux.mk b/linux/linux.mk index b9b223e3f3..9ee9054bed 100644 --- a/linux/linux.mk +++ b/linux/linux.mk @@ -158,6 +158,12 @@ ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y) LINUX_KCFLAGS += -Wno-attribute-alias endif +# https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=5879ab5fafedc8f6f9bfe95a4cf8501b0df90edd +# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97208 +ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_10)$(BR2_microblaze),yy) +LINUX_KCFLAGS += -fno-tree-loop-distribute-patterns +endif + ifeq ($(BR2_LINUX_KERNEL_DTB_OVERLAY_SUPPORT),y) LINUX_MAKE_ENV += DTC_FLAGS=-@ endif -- 2.25.4