1 # SPDX-License-Identifier: GPL-2.0-only
2
3 # cc-cross-prefix
4 # Usage: CROSS_COMPILE := $(call cc-cross-pref
5 # Return first <prefix> where a <prefix>gcc is
6 # If no gcc found in PATH with listed prefixes
7 #
8 # Note: '2>/dev/null' is here to force Make to
9 # would try to directly execute the shell buil
10 # should be kept for a long time since this is
11 # GNU Make 4.2.1 release.
12 cc-cross-prefix = $(firstword $(foreach c, $(1
13 $(if $(shell command -
14
15 # output directory for tests below
16 TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(K
17
18 # try-run
19 # Usage: option = $(call try-run, $(CC)...-o "
20 # Exit code chooses option. "$$TMP" serves as
21 # automatically cleaned up.
22 try-run = $(shell set -e; \
23 TMP=$(TMPOUT)/tmp; \
24 trap "rm -rf $(TMPOUT)" EXIT; \
25 mkdir -p $(TMPOUT); \
26 if ($(1)) >/dev/null 2>&1; \
27 then echo "$(2)"; \
28 else echo "$(3)"; \
29 fi)
30
31 # as-option
32 # Usage: aflags-y += $(call as-option,-Wa$(com
33
34 as-option = $(call try-run,\
35 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBU
36
37 # as-instr
38 # Usage: aflags-y += $(call as-instr,instr,opt
39
40 as-instr = $(call try-run,\
41 printf "%b\n" "$(1)" | $(CC) -Werror $
42
43 # __cc-option
44 # Usage: MY_CFLAGS += $(call __cc-option,$(CC)
45 __cc-option = $(call try-run,\
46 $(1) -Werror $(2) $(3) -c -x c /dev/nu
47
48 # cc-option
49 # Usage: cflags-y += $(call cc-option,-march=w
50
51 cc-option = $(call __cc-option, $(CC),\
52 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(
53
54 # cc-option-yn
55 # Usage: flag := $(call cc-option-yn,-march=wi
56 cc-option-yn = $(if $(call cc-option,$1),y,n)
57
58 # cc-disable-warning
59 # Usage: cflags-y += $(call cc-disable-warning
60 cc-disable-warning = $(if $(call cc-option,-W$
61
62 # gcc-min-version
63 # Usage: cflags-$(call gcc-min-version, 70100)
64 gcc-min-version = $(call test-ge, $(CONFIG_GCC
65
66 # clang-min-version
67 # Usage: cflags-$(call clang-min-version, 1100
68 clang-min-version = $(call test-ge, $(CONFIG_C
69
70 # ld-option
71 # Usage: KBUILD_LDFLAGS += $(call ld-option, -
72 ld-option = $(call try-run, $(LD) $(KBUILD_LDF
73
74 # __rustc-option
75 # Usage: MY_RUSTFLAGS += $(call __rustc-option
76 # TODO: remove RUSTC_BOOTSTRAP=1 when we raise
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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