42d519e3d0
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>
47 lines
1.5 KiB
Plaintext
47 lines
1.5 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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# Kconfig helper macros
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# Convenient variables
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comma := ,
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quote := "
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squote := '
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empty :=
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space := $(empty) $(empty)
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dollar := $
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right_paren := )
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left_paren := (
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# $(if-success,<command>,<then>,<else>)
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# Return <then> if <command> exits with 0, <else> otherwise.
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if-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)")
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# $(success,<command>)
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# Return y if <command> exits with 0, n otherwise
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success = $(if-success,$(1),y,n)
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# $(failure,<command>)
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# Return n if <command> exits with 0, y otherwise
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failure = $(if-success,$(1),n,y)
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# $(cc-option,<flag>)
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# Return y if the compiler supports <flag>, n otherwise
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cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -E -x c /dev/null -o /dev/null)
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# $(ld-option,<flag>)
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# Return y if the linker supports <flag>, n otherwise
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ld-option = $(success,$(LD) -v $(1))
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# $(as-instr,<instr>)
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# Return y if the assembler supports <instr>, n otherwise
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as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -)
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# check if $(CC) and $(LD) exist
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$(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found)
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$(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)
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# Fail if the linker is gold as it's not capable of linking the kernel proper
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$(error-if,$(success, $(LD) -v | grep -q gold), gold linker '$(LD)' not supported)
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# gcc version including patch level
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gcc-version := $(shell,$(srctree)/scripts/gcc-version.sh $(CC))
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