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# 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,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(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 = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) $(2) -Wa$(comma)--fatal-warnings -c -x assembler-with-cpp -o /dev/null -)
as-instr64 = $(as-instr,$(1),$(m64-flag))
# check if $(CC) and $(LD) exist
$(error-if,$(failure,command -v $(CC)),C compiler '$(CC)' not found)
$(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)
# Get the C compiler name, version, and error out if it is not supported.
cc-info := $(shell,$(srctree)/scripts/cc-version.sh $(CC))
$(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this C compiler is not supported.)
cc-name := $(shell,set -- $(cc-info) && echo $1)
cc-version := $(shell,set -- $(cc-info) && echo $2)
# Get the assembler name, version, and error out if it is not supported.
as-info := $(shell,$(srctree)/scripts/as-version.sh $(CC) $(CLANG_FLAGS))
$(error-if,$(success,test -z "$(as-info)"),Sorry$(comma) this assembler is not supported.)
as-name := $(shell,set -- $(as-info) && echo $1)
as-version := $(shell,set -- $(as-info) && echo $2)
# Get the linker name, version, and error out if it is not supported.
ld-info := $(shell,$(srctree)/scripts/ld-version.sh $(LD))
$(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supported.)
ld-name := $(shell,set -- $(ld-info) && echo $1)
ld-version := $(shell,set -- $(ld-info) && echo $2)
# 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)
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