# Kconfig helper macros # Convenient variablescomma       := ,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 otherwisesuccess = $(if-success,$(1),y,n) # $(failure,<command>)# Return n if <command> exits with 0, y otherwisefailure = $(if-success,$(1),n,y) # $(cc-option,<flag>)# Return y if the compiler supports <flag>, n otherwisecc-option = $(success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null) # $(ld-option,<flag>)# Return y if the linker supports <flag>, n otherwiseld-option = $(success,$(LD) -v $(1)) # 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) # gcc version including patch levelgcc-version := $(shell,$(srctree)/scripts/gcc-version.sh $(CC))