Commit 42d519e3 authored Jan 15, 2020 by Catalin Marinas Committed by Will Deacon Jan 15, 2020

kbuild: Add support for 'as-instr' to be used in Kconfig files



Similar to 'cc-option' or 'ld-option', it is occasionally necessary to
check whether the assembler supports certain ISA extensions. In the
arm64 code we currently do this in Makefile with an additional define:

lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)

Add the 'as-instr' option so that it can be used in Kconfig directly:

	def_bool $(as-instr,.arch_extension lse)

Acked-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

parent 46cf053e

scripts/Kconfig.include

+4 −0

Original line number	Diff line number	Diff line
		@@ -31,6 +31,10 @@ cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -E -x c /dev/null -o /de
		# Return y if the linker supports <flag>, n otherwise
		ld-option = $(success,$(LD) -v $(1))

		# $(as-instr,<instr>)
		# Return y if the assembler supports <instr>, n otherwise
		as-instr = $(success,printf "%b\n" "$(1)" \| $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -)

		# check if $(CC) and $(LD) exist
		$(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found)
		$(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)

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