1ec8f24b7SThomas Gleixner# SPDX-License-Identifier: GPL-2.0-only 2e1cfdc0eSMasahiro Yamada# Kconfig helper macros 3e1cfdc0eSMasahiro Yamada 4e1cfdc0eSMasahiro Yamada# Convenient variables 5e1cfdc0eSMasahiro Yamadacomma := , 6e1cfdc0eSMasahiro Yamadaquote := " 7e1cfdc0eSMasahiro Yamadasquote := ' 8e1cfdc0eSMasahiro Yamadaempty := 9e1cfdc0eSMasahiro Yamadaspace := $(empty) $(empty) 10e1cfdc0eSMasahiro Yamadadollar := $ 11e1cfdc0eSMasahiro Yamadaright_paren := ) 12e1cfdc0eSMasahiro Yamadaleft_paren := ( 13e1cfdc0eSMasahiro Yamada 14e1cfdc0eSMasahiro Yamada# $(if-success,<command>,<then>,<else>) 15e1cfdc0eSMasahiro Yamada# Return <then> if <command> exits with 0, <else> otherwise. 16e1cfdc0eSMasahiro Yamadaif-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)") 17e1cfdc0eSMasahiro Yamada 18e1cfdc0eSMasahiro Yamada# $(success,<command>) 19e1cfdc0eSMasahiro Yamada# Return y if <command> exits with 0, n otherwise 20e1cfdc0eSMasahiro Yamadasuccess = $(if-success,$(1),y,n) 21e1cfdc0eSMasahiro Yamada 22902a6898SMasahiro Yamada# $(failure,<command>) 23902a6898SMasahiro Yamada# Return n if <command> exits with 0, y otherwise 24902a6898SMasahiro Yamadafailure = $(if-success,$(1),n,y) 25902a6898SMasahiro Yamada 26e1cfdc0eSMasahiro Yamada# $(cc-option,<flag>) 27e1cfdc0eSMasahiro Yamada# Return y if the compiler supports <flag>, n otherwise 28e8de12fbSStephen Boydcc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -E -x c /dev/null -o /dev/null) 29e1cfdc0eSMasahiro Yamada 30e1cfdc0eSMasahiro Yamada# $(ld-option,<flag>) 31e1cfdc0eSMasahiro Yamada# Return y if the linker supports <flag>, n otherwise 32e1cfdc0eSMasahiro Yamadald-option = $(success,$(LD) -v $(1)) 3359f53855SMasahiro Yamada 34902a6898SMasahiro Yamada# check if $(CC) and $(LD) exist 35902a6898SMasahiro Yamada$(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found) 36902a6898SMasahiro Yamada$(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found) 37902a6898SMasahiro Yamada 38*75959d44SThomas Gleixner# Fail if the linker is gold as it's not capable of linking the kernel proper 39*75959d44SThomas Gleixner$(error-if,$(success, $(LD) -v | grep -q gold), gold linker '$(LD)' not supported) 40*75959d44SThomas Gleixner 4159f53855SMasahiro Yamada# gcc version including patch level 42fa7295abSMasahiro Yamadagcc-version := $(shell,$(srctree)/scripts/gcc-version.sh $(CC)) 43