There are cases where the whole feature, for instance arm64/lse or arm/crypto, can depend on assembler. Current practice is to report buildtime that selected feature is not supported, which can be quite annoying... It'd nicer if we can check assembler first and opt-in feature visibility in Kconfig. Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> Cc: Will Deacon <will.deacon@xxxxxxx> Cc: Marc Zyngier <marc.zyngier@xxxxxxx> Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Signed-off-by: Vladimir Murzin <vladimir.murzin@xxxxxxx> --- scripts/Kconfig.include | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include index dad5583..07c145c 100644 --- a/scripts/Kconfig.include +++ b/scripts/Kconfig.include @@ -22,6 +22,10 @@ success = $(if-success,$(1),y,n) # Return y if the compiler supports <flag>, n otherwise cc-option = $(success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null) +# $(as-instr,<instr>) +# Return y if the assembler supports <instr>, n otherwise +as-instr = $(success,printf "%b\n" "$(1)" | $(CC) -Werror -c -x assembler -o /dev/null -) + # $(ld-option,<flag>) # Return y if the linker supports <flag>, n otherwise ld-option = $(success,$(LD) -v $(1)) -- 1.9.1
