1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 # Kconfig helper macros 2 # Kconfig helper macros
3 3
4 # Convenient variables 4 # Convenient variables
5 comma := , 5 comma := ,
6 quote := " 6 quote := "
7 squote := ' 7 squote := '
8 empty := 8 empty :=
9 space := $(empty) $(empty) 9 space := $(empty) $(empty)
10 dollar := $ 10 dollar := $
11 right_paren := ) 11 right_paren := )
12 left_paren := ( 12 left_paren := (
13 13
14 # $(if-success,<command>,<then>,<else>) 14 # $(if-success,<command>,<then>,<else>)
15 # Return <then> if <command> exits with 0, <el 15 # Return <then> if <command> exits with 0, <else> otherwise.
16 if-success = $(shell,{ $(1); } >/dev/null 2>&1 16 if-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)")
17 17
18 # $(success,<command>) 18 # $(success,<command>)
19 # Return y if <command> exits with 0, n otherw 19 # Return y if <command> exits with 0, n otherwise
20 success = $(if-success,$(1),y,n) 20 success = $(if-success,$(1),y,n)
21 21
22 # $(failure,<command>) 22 # $(failure,<command>)
23 # Return n if <command> exits with 0, y otherw 23 # Return n if <command> exits with 0, y otherwise
24 failure = $(if-success,$(1),n,y) 24 failure = $(if-success,$(1),n,y)
25 25
26 # $(cc-option,<flag>) 26 # $(cc-option,<flag>)
27 # Return y if the compiler supports <flag>, n 27 # Return y if the compiler supports <flag>, n otherwise
28 cc-option = $(success,trap "rm -rf .tmp_$$" EX !! 28 cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -S -x c /dev/null -o /dev/null)
29 29
30 # $(ld-option,<flag>) 30 # $(ld-option,<flag>)
31 # Return y if the linker supports <flag>, n ot 31 # Return y if the linker supports <flag>, n otherwise
32 ld-option = $(success,$(LD) -v $(1)) 32 ld-option = $(success,$(LD) -v $(1))
33 33
>> 34 # $(as-option,<flag>)
>> 35 # /dev/zero is used as output instead of /dev/null as some assembler cribs when
>> 36 # both input and output are same. Also both of them have same write behaviour so
>> 37 # can be easily substituted.
>> 38 as-option = $(success, $(CC) $(CLANG_FLAGS) $(1) -c -x assembler /dev/null -o /dev/zero)
>> 39
34 # $(as-instr,<instr>) 40 # $(as-instr,<instr>)
35 # Return y if the assembler supports <instr>, 41 # Return y if the assembler supports <instr>, n otherwise
36 as-instr = $(success,printf "%b\n" "$(1)" | $( !! 42 as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -)
37 as-instr64 = $(as-instr,$(1),$(m64-flag)) <<
38 43
39 # check if $(CC) and $(LD) exist 44 # check if $(CC) and $(LD) exist
40 $(error-if,$(failure,command -v $(CC)),C compi !! 45 $(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found)
41 $(error-if,$(failure,command -v $(LD)),linker 46 $(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)
42 47
43 # Get the C compiler name, version, and error !! 48 # Fail if the linker is gold as it's not capable of linking the kernel proper
44 cc-info := $(shell,$(srctree)/scripts/cc-versi !! 49 $(error-if,$(success, $(LD) -v | grep -q gold), gold linker '$(LD)' not supported)
45 $(error-if,$(success,test -z "$(cc-info)"),Sor <<
46 cc-name := $(shell,set -- $(cc-info) && echo $ <<
47 cc-version := $(shell,set -- $(cc-info) && ech <<
48 <<
49 # Get the assembler name, version, and error o <<
50 as-info := $(shell,$(srctree)/scripts/as-versi <<
51 $(error-if,$(success,test -z "$(as-info)"),Sor <<
52 as-name := $(shell,set -- $(as-info) && echo $ <<
53 as-version := $(shell,set -- $(as-info) && ech <<
54 <<
55 # Get the linker name, version, and error out <<
56 ld-info := $(shell,$(srctree)/scripts/ld-versi <<
57 $(error-if,$(success,test -z "$(ld-info)"),Sor <<
58 ld-name := $(shell,set -- $(ld-info) && echo $ <<
59 ld-version := $(shell,set -- $(ld-info) && ech <<
60 50
61 # machine bit flags 51 # machine bit flags
62 # $(m32-flag): -m32 if the compiler supports 52 # $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise.
63 # $(m64-flag): -m64 if the compiler supports 53 # $(m64-flag): -m64 if the compiler supports it, or an empty string otherwise.
64 cc-option-bit = $(if-success,$(CC) -Werror $(1 54 cc-option-bit = $(if-success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null,$(1))
65 m32-flag := $(cc-option-bit,-m32) 55 m32-flag := $(cc-option-bit,-m32)
66 m64-flag := $(cc-option-bit,-m64) 56 m64-flag := $(cc-option-bit,-m64)
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