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# 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)

# $(cc-option,<flag>)
# Return y if the compiler supports <flag>, n otherwise
cc-option = $(success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null)

# $(ld-option,<flag>)
# Return y if the linker supports <flag>, n otherwise
ld-option = $(success,$(LD) -v $(1))

# $(as-option,<flag>)
# /dev/zero is used as output instead of /dev/null as some assembler cribs when
# both input and output are same. Also both of them have same write behaviour so
# can be easily substituted.
as-option = $(success, $(CC) $(CLANG_FLAGS) $(1) -c -x assembler /dev/null -o /dev/zero)

# gcc version including patch level
gcc-version := $(shell,$(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//')