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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) # Get the compiler name, version, and error out if it is not supported. cc-info := $(shell,$(srctree)/scripts/cc-version.sh $(CC)) $(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this compiler is not supported.) cc-name := $(shell,set -- $(cc-info) && echo $1) cc-version := $(shell,set -- $(cc-info) && echo $2) # Get the assembler name, version, and error out if it is not supported. as-info := $(shell,$(srctree)/scripts/as-version.sh $(CC) $(CLANG_FLAGS)) $(error-if,$(success,test -z "$(as-info)"),Sorry$(comma) this assembler is not supported.) as-name := $(shell,set -- $(as-info) && echo $1) as-version := $(shell,set -- $(as-info) && echo $2) # Get the linker name, version, and error out if it is not supported. ld-info := $(shell,$(srctree)/scripts/ld-version.sh $(LD)) $(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supported.) ld-name := $(shell,set -- $(ld-info) && echo $1) ld-version := $(shell,set -- $(ld-info) && echo $2) # 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)