1# SPDX-License-Identifier: GPL-2.0-only 2# Kconfig helper macros 3 4# Convenient variables 5comma := , 6quote := " 7squote := ' 8empty := 9space := $(empty) $(empty) 10dollar := $ 11right_paren := ) 12left_paren := ( 13 14# $(if-success,<command>,<then>,<else>) 15# Return <then> if <command> exits with 0, <else> otherwise. 16if-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)") 17 18# $(success,<command>) 19# Return y if <command> exits with 0, n otherwise 20success = $(if-success,$(1),y,n) 21 22# $(failure,<command>) 23# Return n if <command> exits with 0, y otherwise 24failure = $(if-success,$(1),n,y) 25 26# $(cc-option,<flag>) 27# Return y if the compiler supports <flag>, n otherwise 28cc-option = $(success,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o) 29 30# $(ld-option,<flag>) 31# Return y if the linker supports <flag>, n otherwise 32ld-option = $(success,$(LD) -v $(1)) 33 34# $(as-instr,<instr>) 35# Return y if the assembler supports <instr>, n otherwise 36as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) $(2) -Wa$(comma)--fatal-warnings -c -x assembler-with-cpp -o /dev/null -) 37as-instr64 = $(as-instr,$(1),$(m64-flag)) 38 39# check if $(CC) and $(LD) exist 40$(error-if,$(failure,command -v $(CC)),C compiler '$(CC)' not found) 41$(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found) 42 43# Get the C compiler name, version, and error out if it is not supported. 44cc-info := $(shell,$(srctree)/scripts/cc-version.sh $(CC)) 45$(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this C compiler is not supported.) 46cc-name := $(shell,set -- $(cc-info) && echo $1) 47cc-version := $(shell,set -- $(cc-info) && echo $2) 48 49# Get the assembler name, version, and error out if it is not supported. 50as-info := $(shell,$(srctree)/scripts/as-version.sh $(CC) $(CLANG_FLAGS)) 51$(error-if,$(success,test -z "$(as-info)"),Sorry$(comma) this assembler is not supported.) 52as-name := $(shell,set -- $(as-info) && echo $1) 53as-version := $(shell,set -- $(as-info) && echo $2) 54 55# Get the linker name, version, and error out if it is not supported. 56ld-info := $(shell,$(srctree)/scripts/ld-version.sh $(LD)) 57$(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supported.) 58ld-name := $(shell,set -- $(ld-info) && echo $1) 59ld-version := $(shell,set -- $(ld-info) && echo $2) 60 61# machine bit flags 62# $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise. 63# $(m64-flag): -m64 if the compiler supports it, or an empty string otherwise. 64cc-option-bit = $(if-success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null,$(1)) 65m32-flag := $(cc-option-bit,-m32) 66m64-flag := $(cc-option-bit,-m64) 67