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Merge tag 'bootconfig-fixes-v6.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel...
[thirdparty/kernel/linux.git] / scripts / Makefile.compiler
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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.
12cc-cross-prefix = $(firstword $(foreach c, $(1), \
13 $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c))))
14
15# output directory for tests below
16TMPOUT = $(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. "$$TMP" serves as a temporary file and is
21# automatically cleaned up.
22try-run = $(shell set -e; \
23 TMP=$(TMPOUT)/tmp; \
57fd251c 24 trap "rm -rf $(TMPOUT)" EXIT; \
dd298656 25 mkdir -p $(TMPOUT); \
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26 if ($(1)) >/dev/null 2>&1; \
27 then echo "$(2)"; \
28 else echo "$(3)"; \
29 fi)
30
31# as-option
d5c8d6e0 32# Usage: aflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
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33
34as-option = $(call try-run,\
43fc0a99 35 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(1) -c -x assembler-with-cpp /dev/null -o "$$TMP",$(1),$(2))
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36
37# as-instr
d5c8d6e0 38# Usage: aflags-y += $(call as-instr,instr,option1,option2)
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39
40as-instr = $(call try-run,\
0ee695a4 41 printf "%b\n" "$(1)" | $(CC) -Werror $(CLANG_FLAGS) $(KBUILD_AFLAGS) -Wa$(comma)--fatal-warnings -c -x assembler-with-cpp -o "$$TMP" -,$(2),$(3))
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42
43# __cc-option
44# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
45__cc-option = $(call try-run,\
46 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
47
48# cc-option
49# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
50
51cc-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)
56cc-option-yn = $(call try-run,\
57 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
58
59# cc-disable-warning
60# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
61cc-disable-warning = $(call try-run,\
62 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
63
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64# gcc-min-version
65# Usage: cflags-$(call gcc-min-version, 70100) += -foo
fccb3d3e 66gcc-min-version = $(call test-ge, $(CONFIG_GCC_VERSION), $1)
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67
68# clang-min-version
69# Usage: cflags-$(call clang-min-version, 110000) += -foo
fccb3d3e 70clang-min-version = $(call test-ge, $(CONFIG_CLANG_VERSION), $1)
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71
72# ld-option
73# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
74ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))