1 # SPDX-License-Identifier: GPL-2.0-only
2 # Kconfig helper macros
3
4 # Convenient variables
5 comma := ,
6 quote := "
7 squote := '
8 empty :=
9 space := $(empty) $(empty)
10 dollar := $
11 right_paren := )
12 left_paren := (
13
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)")
17
18 # $(success,<command>)
19 # Return y if <command> exits with 0, n otherwise
20 success = $(if-success,$(1),y,n)
21
22 # $(failure,<command>)
23 # Return n if <command> exits with 0, y otherwise
24 failure = $(if-success,$(1),n,y)
25
26 # $(cc-option,<flag>)
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)
29
30 # $(ld-option,<flag>)
31 # Return y if the linker supports <flag>, n otherwise
32 ld-option = $(success,$(LD) -v $(1))
33
34 # $(as-instr,<instr>)
35 # Return y if the assembler supports <instr>, n otherwise
36 as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) $(2) -Wa$(comma)--fatal-warnings -c -x assembler-with-cpp -o /dev/null -)
37 as-instr64 = $(as-instr,$(1),$(m64-flag))
38
39 # check if $(CC) and $(LD) exist
40 $(error-if,$(failure,command -v $(CC)),C compiler '$(CC)' not found)
41 $(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)
42
43 # Get the C compiler name, version, and error out if it is not supported.
44 cc-info := $(shell,$(srctree)/scripts/cc-version.sh $(CC))
45 $(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this C compiler is not supported.)
46 cc-name := $(shell,set -- $(cc-info) && echo $1)
47 cc-version := $(shell,set -- $(cc-info) && echo $2)
48
49 # Get the assembler name, version, and error out if it is not supported.
50 as-info := $(shell,$(srctree)/scripts/as-version.sh $(CC) $(CLANG_FLAGS))
51 $(error-if,$(success,test -z "$(as-info)"),Sorry$(comma) this assembler is not supported.)
52 as-name := $(shell,set -- $(as-info) && echo $1)
53 as-version := $(shell,set -- $(as-info) && echo $2)
54
55 # Get the linker name, version, and error out if it is not supported.
56 ld-info := $(shell,$(srctree)/scripts/ld-version.sh $(LD))
57 $(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supported.)
58 ld-name := $(shell,set -- $(ld-info) && echo $1)
59 ld-version := $(shell,set -- $(ld-info) && echo $2)
60
61 # machine bit flags
62 # $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise.
63 # $(m64-flag): -m64 if the compiler supports it, or an empty string otherwise.
64 cc-option-bit = $(if-success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null,$(1))
65 m32-flag := $(cc-option-bit,-m32)
66 m64-flag := $(cc-option-bit,-m64)
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