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arch/Config.in.x86: add option for -march=x86-64

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We already have support for a wide range of x86-64 CPUs, but we don't
have any option to build for the most generic possible x86-64 CPU, as
made available by the -march=x86-64 GCC option.

This commit makes this option available in Buildroot.

It only really makes sense to use as a 64-bit CPU, and not as a 32-bit
one, so we guard it behind BR2_x86_64.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[yann.morin.1998@free.fr: it's an x86-64-only CPU]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Thomas Petazzoni 2022-01-09 09:01:22 +01:00 committed by Yann E. MORIN
parent bf01e51f3c
commit d6ce2a1681
1 changed files with 12 additions and 0 deletions
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arch/Config.in.x86
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@ -81,6 +81,17 @@ config BR2_x86_prescott
select BR2_X86_CPU_HAS_SSE
select BR2_X86_CPU_HAS_SSE2
select BR2_X86_CPU_HAS_SSE3
config BR2_x86_x86_64
bool "x86-64"
depends on BR2_x86_64
select BR2_X86_CPU_HAS_MMX
select BR2_X86_CPU_HAS_SSE
select BR2_X86_CPU_HAS_SSE2
help
This option corresponds to -march=x86-64, documented as a
"Generic CPU with 64-bit extensions" by the GCC
documentation. It is a 64-bit CPU with MMX, SSE and SSE2
support.
config BR2_x86_nocona
bool "nocona"
select BR2_X86_CPU_HAS_MMX
@ -281,6 +292,7 @@ config BR2_GCC_TARGET_ARCH
default "pentium3" if BR2_x86_pentium3
default "pentium4" if BR2_x86_pentium4
default "prescott" if BR2_x86_prescott
default "x86-64" if BR2_x86_x86_64
default "nocona" if BR2_x86_nocona
default "core2" if BR2_x86_core2
default "corei7" if BR2_x86_corei7