Commit 01412081 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

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



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: default avatarStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: default avatarIngo 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
parent ea1dcca1

arch/x86/Kconfig.cpu

+5 −1
Original line number Diff line number Diff line
@@ -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