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[PATCH] Disable AVX instruction set on IA32 and x86_64 platforms 

If gnu-efi is compiled with "-march=native" on a host that supports AVX, both
gcc and clang will use AVX instructions freely which is currently not supported
and will result in a non-functional gnu-efi build (e.g. black screen, hangs).

For now, disable AVX on IA32 and x86_64 by checking first if the compiler does
actually support the appropriate flag (-mno-avx) and use it if possible.

Credit for the compiler command line to check if a flag is supported goes to
Gentoo's awesome flag-o-matic eclass, where it is taken from. Thanks.

Signed-off-by: Matthias Dahl <matthias.dahl@binary-island.eu>
Signed-off-by: Nigel Croxon <ncroxon@redhat.com>
This commit is contained in:
Nigel Croxon 2017-07-13 08:43:16 -04:00
parent af5d1494a9
commit 99d94682de
1 changed files with 8 additions and 0 deletions
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8
Make.defaults
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@ -120,6 +120,14 @@ ifeq ($(ARCH),x86_64)
endif
endif
ifneq (,$(filter $(ARCH),ia32 x86_64))
# Disable AVX, if the compiler supports that.
CC_CAN_DISABLE_AVX=$(shell $(CC) -Werror -c -o /dev/null -xc -mno-avx - </dev/null >/dev/null 2>&1 && echo 1)
ifeq ($(CC_CAN_DISABLE_AVX), 1)
CFLAGS += -mno-avx
endif
endif
ifeq ($(ARCH),mips64el)
CFLAGS += -march=mips64r2
ARCH3264 = -mabi=64