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- # SPDX-License-Identifier: GPL-2.0-only
- # cc-cross-prefix
- # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
- # Return first <prefix> where a <prefix>gcc is found in PATH.
- # If no gcc found in PATH with listed prefixes return nothing
- #
- # Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it
- # would try to directly execute the shell builtin 'command'. This workaround
- # should be kept for a long time since this issue was fixed only after the
- # GNU Make 4.2.1 release.
- cc-cross-prefix = $(firstword $(foreach c, $(1), \
- $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c))))
- # output directory for tests below
- TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$
- # try-run
- # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
- # Exit code chooses option. "$$TMP" serves as a temporary file and is
- # automatically cleaned up.
- try-run = $(shell set -e; \
- TMP=$(TMPOUT)/tmp; \
- TMPO=$(TMPOUT)/tmp.o; \
- mkdir -p $(TMPOUT); \
- trap "rm -rf $(TMPOUT)" EXIT; \
- if ($(1)) >/dev/null 2>&1; \
- then echo "$(2)"; \
- else echo "$(3)"; \
- fi)
- # as-option
- # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
- as-option = $(call try-run,\
- $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
- # as-instr
- # Usage: cflags-y += $(call as-instr,instr,option1,option2)
- as-instr = $(call try-run,\
- printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
- # __cc-option
- # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
- __cc-option = $(call try-run,\
- $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
- # cc-option
- # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
- cc-option = $(call __cc-option, $(CC),\
- $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
- # cc-option-yn
- # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
- cc-option-yn = $(call try-run,\
- $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
- # cc-disable-warning
- # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
- cc-disable-warning = $(call try-run,\
- $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
- # cc-ifversion
- # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
- cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4))
- # ld-option
- # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
- ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
- # ld-ifversion
- # Usage: $(call ld-ifversion, -ge, 22252, y)
- ld-ifversion = $(shell [ $(CONFIG_LD_VERSION)0 $(1) $(2)0 ] && echo $(3) || echo $(4))
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