1 # SPDX-License-Identifier: GPL-2.0-only
2 # Kconfig helper macros
9 space := $(empty) $(empty)
14 # $(if-success,<command>,<then>,<else>)
15 # Return <then> if <command> exits with 0, <else> otherwise.
16 if-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)")
18 # $(success,<command>)
19 # Return y if <command> exits with 0, n otherwise
20 success = $(if-success,$(1),y,n)
22 # $(failure,<command>)
23 # Return n if <command> exits with 0, y otherwise
24 failure = $(if-success,$(1),n,y)
27 # Return y if the compiler supports <flag>, n otherwise
28 cc-option = $(success,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)
31 # Return y if the linker supports <flag>, n otherwise
32 ld-option = $(success,$(LD) -v $(1))
35 # Return y if the assembler supports <instr>, n otherwise
36 as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -)
38 # check if $(CC) and $(LD) exist
39 $(error-if,$(failure,command -v $(CC)),C compiler '$(CC)' not found)
40 $(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)
42 # Get the C compiler name, version, and error out if it is not supported.
43 cc-info := $(shell,$(srctree)/scripts/cc-version.sh $(CC))
44 $(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this C compiler is not supported.)
45 cc-name := $(shell,set -- $(cc-info) && echo $1)
46 cc-version := $(shell,set -- $(cc-info) && echo $2)
48 # Get the assembler name, version, and error out if it is not supported.
49 as-info := $(shell,$(srctree)/scripts/as-version.sh $(CC) $(CLANG_FLAGS))
50 $(error-if,$(success,test -z "$(as-info)"),Sorry$(comma) this assembler is not supported.)
51 as-name := $(shell,set -- $(as-info) && echo $1)
52 as-version := $(shell,set -- $(as-info) && echo $2)
54 # Get the linker name, version, and error out if it is not supported.
55 ld-info := $(shell,$(srctree)/scripts/ld-version.sh $(LD))
56 $(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supported.)
57 ld-name := $(shell,set -- $(ld-info) && echo $1)
58 ld-version := $(shell,set -- $(ld-info) && echo $2)
61 # $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise.
62 # $(m64-flag): -m64 if the compiler supports it, or an empty string otherwise.
63 cc-option-bit = $(if-success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null,$(1))
64 m32-flag := $(cc-option-bit,-m32)
65 m64-flag := $(cc-option-bit,-m64)