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Re: [PATCH 1/3] x86: allow Kconfig control over psABI level
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 12 Jul 2023 15:01:15 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 12 Jul 2023 13:01:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 12.07.2023 14:33, Jan Beulich wrote:
> --- a/xen/arch/x86/arch.mk
> +++ b/xen/arch/x86/arch.mk
> @@ -36,6 +36,10 @@ CFLAGS += -mno-red-zone -fpic
> # the SSE setup for variadic function calls.
> CFLAGS += -mno-mmx -mno-sse $(call cc-option,$(CC),-mskip-rax-setup)
>
> +# Enable the selected baseline ABI, if supported by the compiler.
> +CFLAGS-$(CONFIG_X86_64_V2) += $(call cc-option,$(CC),-march=x86-64-v2)
> +CFLAGS-$(CONFIG_X86_64_V3) += $(call cc-option,$(CC),-march=x86-64-v3)
Hmm, I should have remembered that this won't work with older gcc,
because of how $(cc-option ...) works. I recall someone else already
fell into this trap a few years ago, but then they weren't following
up on the suggestions on how to make their somewhat fragile workaround
more robust. Now I'm on the hook ...
Jan
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