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From 99d94682de590719f9333fcf091910a9581b44c0 Mon Sep 17 00:00:00 2001
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From: Nigel Croxon <ncroxon@redhat.com>
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Date: Thu, 13 Jul 2017 08:43:16 -0400
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Subject: [PATCH 01/25] [PATCH] Disable AVX instruction set on IA32 and x86_64
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platforms
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If gnu-efi is compiled with "-march=native" on a host that supports AVX, both
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gcc and clang will use AVX instructions freely which is currently not supported
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and will result in a non-functional gnu-efi build (e.g. black screen, hangs).
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For now, disable AVX on IA32 and x86_64 by checking first if the compiler does
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actually support the appropriate flag (-mno-avx) and use it if possible.
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Credit for the compiler command line to check if a flag is supported goes to
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Gentoo's awesome flag-o-matic eclass, where it is taken from. Thanks.
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Signed-off-by: Matthias Dahl <matthias.dahl@binary-island.eu>
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Signed-off-by: Nigel Croxon <ncroxon@redhat.com>
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---
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Make.defaults | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/Make.defaults b/Make.defaults
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index 16f1fd21848..446e676dc14 100755
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--- a/Make.defaults
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+++ b/Make.defaults
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@@ -120,6 +120,14 @@ ifeq ($(ARCH),x86_64)
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endif
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endif
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+ifneq (,$(filter $(ARCH),ia32 x86_64))
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+ # Disable AVX, if the compiler supports that.
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+ CC_CAN_DISABLE_AVX=$(shell $(CC) -Werror -c -o /dev/null -xc -mno-avx - </dev/null >/dev/null 2>&1 && echo 1)
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+ ifeq ($(CC_CAN_DISABLE_AVX), 1)
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+ CFLAGS += -mno-avx
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+ endif
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+endif
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+
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ifeq ($(ARCH),mips64el)
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CFLAGS += -march=mips64r2
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ARCH3264 = -mabi=64
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--
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2.15.0
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