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. "$$TMP" serves as a temporary file and is 21 # automatically cleaned up. 22 try-run = $(shell set -e; \ 23 TMP=$(TMPOUT)/tmp; \ 24 trap "rm -rf $(TMPOUT)" EXIT; \ 25 mkdir -p $(TMPOUT); \ 26 if ($(1)) >/dev/null 2>&1; \ 27 then echo "$(2)"; \ 28 else echo "$(3)"; \ 29 fi) 30 31 # as-option 32 # Usage: aflags-y += $(call as-option,-Wa$(comma)-isa=foo,) 33 34 as-option = $(call try-run,\ 35 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(1) -c -x assembler-with-cpp /dev/null -o "$$TMP",$(1),$(2)) 36 37 # as-instr 38 # Usage: aflags-y += $(call as-instr,instr,option1,option2) 39 40 as-instr = $(call try-run,\ 41 printf "%b\n" "$(1)" | $(CC) -Werror $(CLANG_FLAGS) $(KBUILD_AFLAGS) -Wa$(comma)--fatal-warnings -c -x assembler-with-cpp -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 $(1))) 63 64 # gcc-min-version 65 # Usage: cflags-$(call gcc-min-version, 70100) += -foo 66 gcc-min-version = $(call test-ge, $(CONFIG_GCC_VERSION), $1) 67 68 # clang-min-version 69 # Usage: cflags-$(call clang-min-version, 110000) += -foo 70 clang-min-version = $(call test-ge, $(CONFIG_CLANG_VERSION), $1) 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))
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