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- # SPDX-License-Identifier: GPL-2.0-only
- # Kconfig helper macros
- # Convenient variables
- comma := ,
- quote := "
- squote := '
- empty :=
- space := $(empty) $(empty)
- dollar := $
- right_paren := )
- left_paren := (
- # $(if-success,<command>,<then>,<else>)
- # Return <then> if <command> exits with 0, <else> otherwise.
- if-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)")
- # $(success,<command>)
- # Return y if <command> exits with 0, n otherwise
- success = $(if-success,$(1),y,n)
- # $(failure,<command>)
- # Return n if <command> exits with 0, y otherwise
- failure = $(if-success,$(1),n,y)
- # $(cc-option,<flag>)
- # Return y if the compiler supports <flag>, n otherwise
- cc-option = $(success,mkdir .tmp_$$$$; trap "rm -rf .tmp_$$$$" EXIT; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$$$/tmp.o)
- # $(ld-option,<flag>)
- # 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)
- # Fail if the linker is gold as it's not capable of linking the kernel proper
- $(error-if,$(success, $(LD) -v | grep -q gold), gold linker '$(LD)' not supported)
- # machine bit flags
- # $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise.
- # $(m64-flag): -m64 if the compiler supports it, or an empty string otherwise.
- cc-option-bit = $(if-success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null,$(1))
- m32-flag := $(cc-option-bit,-m32)
- m64-flag := $(cc-option-bit,-m64)
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