diff options
| author | Ingo Molnar <mingo@kernel.org> | 2025-03-24 08:05:19 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2025-03-25 08:24:06 +0100 |
| commit | 01412081863aa81db47423d5719f2726d2a00a32 (patch) | |
| tree | 5ba515a4ba5aad68458635145dc97cbcf2e383dc | |
| parent | ea1dcca1de129dfdf145338a868648bc0e24717c (diff) | |
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: 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
| -rw-r--r-- | arch/x86/Kconfig.cpu | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu index 9d108a54c30a..87bede96e800 100644 --- a/arch/x86/Kconfig.cpu +++ b/arch/x86/Kconfig.cpu @@ -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 |