[dpdk-dev] [PATCH v3] build: disable gcc AVX512F support
Yongseok Koh
yskoh at mellanox.com
Sat Nov 3 02:06:32 CET 2018
This is a workaround to prevent a crash, which might be caused by
optimization of newer gcc (7.3.0) on Intel Skylake.
This disables AVX512F support of gcc by adding -mno-avx512f if it is
disabled in DPDK (CONFIG_RTE_ENABLE_AVX512=n).
This does not apply to the meson build as that doesn't have such an option
but always enable AVX512F whenever supported.
Bugzilla ID: 97
Cc: stable at dpdk.org
Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
---
v3:
* use AUTO_CPUFLAGS instead of redundant check for gcc
* remove the change from meson build
v2:
* disable the flag only in case of gcc
mk/rte.cpuflags.mk | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/mk/rte.cpuflags.mk b/mk/rte.cpuflags.mk
index 43ed84155b..c3291b17a1 100644
--- a/mk/rte.cpuflags.mk
+++ b/mk/rte.cpuflags.mk
@@ -68,6 +68,11 @@ endif
ifneq ($(filter $(AUTO_CPUFLAGS),__AVX512F__),)
ifeq ($(CONFIG_RTE_ENABLE_AVX512),y)
CPUFLAGS += AVX512F
+else
+# disable AVX512F support of gcc as a workaround for Bug 97
+ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
+MACHINE_CFLAGS += -mno-avx512f
+endif
endif
endif
--
2.11.0
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