# 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 = $(success,printf "%b
  " "$(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)