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x86/kbuild/64: Test for the availability of the -mtune=native compiler flag

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Stephen reported this build failure when cross-compiling:

  cc1: error: bad value 'native' for '-march=' switch

Test for the availability of the -march=native flag.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Stephen Rothwell <sfr@canb.auug.org.au> # build test
Cc: Tor Vic <torvic9@mailbox.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/20250324172723.49fb0416@canb.auug.org.au
This commit is contained in:
Ingo Molnar
2025-03-24 08:05:19 +01:00
parent ea1dcca1de
commit 0141208186
1 changed files with 5 additions and 1 deletions
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6
arch/x86/Kconfig.cpu
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@@ -245,10 +245,14 @@ config MATOM
endchoice
config CC_HAS_MARCH_NATIVE
# This flag might not be available in cross-compilers:
def_bool $(cc-option, -march=native)
config X86_NATIVE_CPU
bool "Build and optimize for local/native CPU"
depends on X86_64
default n
depends on CC_HAS_MARCH_NATIVE
help
Optimize for the current CPU used to compile the kernel.
Use this option if you intend to build the kernel for your