1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 2
3 # cc-cross-prefix 3 # cc-cross-prefix
4 # Usage: CROSS_COMPILE := $(call cc-cross-pref 4 # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
5 # Return first <prefix> where a <prefix>gcc is 5 # Return first <prefix> where a <prefix>gcc is found in PATH.
6 # If no gcc found in PATH with listed prefixes 6 # If no gcc found in PATH with listed prefixes return nothing
7 # 7 #
8 # Note: '2>/dev/null' is here to force Make to 8 # Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it
9 # would try to directly execute the shell buil 9 # would try to directly execute the shell builtin 'command'. This workaround
10 # should be kept for a long time since this is 10 # should be kept for a long time since this issue was fixed only after the
11 # GNU Make 4.2.1 release. 11 # GNU Make 4.2.1 release.
12 cc-cross-prefix = $(firstword $(foreach c, $(1 12 cc-cross-prefix = $(firstword $(foreach c, $(1), \
13 $(if $(shell command - 13 $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c))))
14 14
15 # output directory for tests below 15 # output directory for tests below
16 TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(K 16 TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$
17 17
18 # try-run 18 # try-run
19 # Usage: option = $(call try-run, $(CC)...-o " 19 # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
20 # Exit code chooses option. "$$TMP" serves as 20 # Exit code chooses option. "$$TMP" serves as a temporary file and is
21 # automatically cleaned up. 21 # automatically cleaned up.
22 try-run = $(shell set -e; \ 22 try-run = $(shell set -e; \
23 TMP=$(TMPOUT)/tmp; \ 23 TMP=$(TMPOUT)/tmp; \
24 trap "rm -rf $(TMPOUT)" EXIT; \ <<
25 mkdir -p $(TMPOUT); \ 24 mkdir -p $(TMPOUT); \
>> 25 trap "rm -rf $(TMPOUT)" EXIT; \
26 if ($(1)) >/dev/null 2>&1; \ 26 if ($(1)) >/dev/null 2>&1; \
27 then echo "$(2)"; \ 27 then echo "$(2)"; \
28 else echo "$(3)"; \ 28 else echo "$(3)"; \
29 fi) 29 fi)
30 30
31 # as-option 31 # as-option
32 # Usage: aflags-y += $(call as-option,-Wa$(com !! 32 # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
33 33
34 as-option = $(call try-run,\ 34 as-option = $(call try-run,\
35 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBU !! 35 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
36 36
37 # as-instr 37 # as-instr
38 # Usage: aflags-y += $(call as-instr,instr,opt !! 38 # Usage: cflags-y += $(call as-instr,instr,option1,option2)
39 39
40 as-instr = $(call try-run,\ 40 as-instr = $(call try-run,\
41 printf "%b\n" "$(1)" | $(CC) -Werror $ !! 41 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
42 42
43 # __cc-option 43 # __cc-option
44 # Usage: MY_CFLAGS += $(call __cc-option,$(CC) 44 # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
45 __cc-option = $(call try-run,\ 45 __cc-option = $(call try-run,\
46 $(1) -Werror $(2) $(3) -c -x c /dev/nu 46 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
47 47
48 # cc-option 48 # cc-option
49 # Usage: cflags-y += $(call cc-option,-march=w 49 # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
50 50
51 cc-option = $(call __cc-option, $(CC),\ 51 cc-option = $(call __cc-option, $(CC),\
52 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$( 52 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
53 53
54 # cc-option-yn 54 # cc-option-yn
55 # Usage: flag := $(call cc-option-yn,-march=wi 55 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
56 cc-option-yn = $(if $(call cc-option,$1),y,n) !! 56 cc-option-yn = $(call try-run,\
>> 57 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
57 58
58 # cc-disable-warning 59 # cc-disable-warning
59 # Usage: cflags-y += $(call cc-disable-warning 60 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
60 cc-disable-warning = $(if $(call cc-option,-W$ !! 61 cc-disable-warning = $(call try-run,\
>> 62 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
61 63
62 # gcc-min-version !! 64 # cc-ifversion
63 # Usage: cflags-$(call gcc-min-version, 70100) !! 65 # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
64 gcc-min-version = $(call test-ge, $(CONFIG_GCC !! 66 cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4))
65 <<
66 # clang-min-version <<
67 # Usage: cflags-$(call clang-min-version, 1100 <<
68 clang-min-version = $(call test-ge, $(CONFIG_C <<
69 67
70 # ld-option 68 # ld-option
71 # Usage: KBUILD_LDFLAGS += $(call ld-option, - 69 # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
72 ld-option = $(call try-run, $(LD) $(KBUILD_LDF 70 ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
73 71
74 # __rustc-option !! 72 # ld-ifversion
75 # Usage: MY_RUSTFLAGS += $(call __rustc-option !! 73 # Usage: $(call ld-ifversion, -ge, 22252, y)
76 # TODO: remove RUSTC_BOOTSTRAP=1 when we raise !! 74 ld-ifversion = $(shell [ $(CONFIG_LD_VERSION)0 $(1) $(2)0 ] && echo $(3) || echo $(4))
77 __rustc-option = $(call try-run,\ <<
78 echo '#![allow(missing_docs)]#![featur <<
79 $(1) --sysroot=/dev/null $(filter-out <<
80 --crate-type=rlib --out-dir=$(TMPOUT) <<
81 <<
82 # rustc-option <<
83 # Usage: rustflags-y += $(call rustc-option,-C <<
84 rustc-option = $(call __rustc-option, $(RUSTC) <<
85 $(KBUILD_RUSTFLAGS),$(1),$(2)) <<
86 <<
87 # rustc-option-yn <<
88 # Usage: flag := $(call rustc-option-yn,-Cinst <<
89 rustc-option-yn = $(if $(call rustc-option,$1) <<
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