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57fd251c MY |
1 | # SPDX-License-Identifier: GPL-2.0-only |
2 | ||
3 | # cc-cross-prefix | |
4 | # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) | |
5 | # Return first <prefix> where a <prefix>gcc is found in PATH. | |
6 | # If no gcc found in PATH with listed prefixes return nothing | |
7 | # | |
8 | # Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it | |
9 | # would try to directly execute the shell builtin 'command'. This workaround | |
10 | # should be kept for a long time since this issue was fixed only after the | |
11 | # GNU Make 4.2.1 release. | |
12 | cc-cross-prefix = $(firstword $(foreach c, $(1), \ | |
13 | $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c)))) | |
14 | ||
15 | # output directory for tests below | |
16 | TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$ | |
17 | ||
18 | # try-run | |
19 | # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) | |
20 | # Exit code chooses option. "$$TMP" serves as a temporary file and is | |
21 | # automatically cleaned up. | |
22 | try-run = $(shell set -e; \ | |
23 | TMP=$(TMPOUT)/tmp; \ | |
57fd251c | 24 | trap "rm -rf $(TMPOUT)" EXIT; \ |
dd298656 | 25 | mkdir -p $(TMPOUT); \ |
57fd251c MY |
26 | if ($(1)) >/dev/null 2>&1; \ |
27 | then echo "$(2)"; \ | |
28 | else echo "$(3)"; \ | |
29 | fi) | |
30 | ||
31 | # as-option | |
32 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) | |
33 | ||
34 | as-option = $(call try-run,\ | |
35 | $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) | |
36 | ||
37 | # as-instr | |
38 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) | |
39 | ||
40 | as-instr = $(call try-run,\ | |
41 | printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) | |
42 | ||
43 | # __cc-option | |
44 | # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) | |
45 | __cc-option = $(call try-run,\ | |
46 | $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4)) | |
47 | ||
48 | # cc-option | |
49 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) | |
50 | ||
51 | cc-option = $(call __cc-option, $(CC),\ | |
52 | $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2)) | |
53 | ||
54 | # cc-option-yn | |
55 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) | |
56 | cc-option-yn = $(call try-run,\ | |
57 | $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) | |
58 | ||
59 | # cc-disable-warning | |
60 | # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) | |
61 | cc-disable-warning = $(call try-run,\ | |
62 | $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) | |
63 | ||
88b61e3b ND |
64 | # gcc-min-version |
65 | # Usage: cflags-$(call gcc-min-version, 70100) += -foo | |
fccb3d3e | 66 | gcc-min-version = $(call test-ge, $(CONFIG_GCC_VERSION), $1) |
88b61e3b ND |
67 | |
68 | # clang-min-version | |
69 | # Usage: cflags-$(call clang-min-version, 110000) += -foo | |
fccb3d3e | 70 | clang-min-version = $(call test-ge, $(CONFIG_CLANG_VERSION), $1) |
57fd251c MY |
71 | |
72 | # ld-option | |
73 | # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y) | |
74 | ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3)) | |
75 | ||
76 | # ld-ifversion | |
77 | # Usage: $(call ld-ifversion, -ge, 22252, y) | |
78 | ld-ifversion = $(shell [ $(CONFIG_LD_VERSION)0 $(1) $(2)0 ] && echo $(3) || echo $(4)) |