157fd251cSMasahiro Yamada# SPDX-License-Identifier: GPL-2.0-only 257fd251cSMasahiro Yamada 357fd251cSMasahiro Yamada# cc-cross-prefix 457fd251cSMasahiro Yamada# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) 557fd251cSMasahiro Yamada# Return first <prefix> where a <prefix>gcc is found in PATH. 657fd251cSMasahiro Yamada# If no gcc found in PATH with listed prefixes return nothing 757fd251cSMasahiro Yamada# 857fd251cSMasahiro Yamada# Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it 957fd251cSMasahiro Yamada# would try to directly execute the shell builtin 'command'. This workaround 1057fd251cSMasahiro Yamada# should be kept for a long time since this issue was fixed only after the 1157fd251cSMasahiro Yamada# GNU Make 4.2.1 release. 1257fd251cSMasahiro Yamadacc-cross-prefix = $(firstword $(foreach c, $(1), \ 1357fd251cSMasahiro Yamada $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c)))) 1457fd251cSMasahiro Yamada 1557fd251cSMasahiro Yamada# output directory for tests below 1657fd251cSMasahiro YamadaTMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$ 1757fd251cSMasahiro Yamada 1857fd251cSMasahiro Yamada# try-run 1957fd251cSMasahiro Yamada# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) 2057fd251cSMasahiro Yamada# Exit code chooses option. "$$TMP" serves as a temporary file and is 2157fd251cSMasahiro Yamada# automatically cleaned up. 2257fd251cSMasahiro Yamadatry-run = $(shell set -e; \ 2357fd251cSMasahiro Yamada TMP=$(TMPOUT)/tmp; \ 2457fd251cSMasahiro Yamada trap "rm -rf $(TMPOUT)" EXIT; \ 25dd298656SMasahiro Yamada mkdir -p $(TMPOUT); \ 2657fd251cSMasahiro Yamada if ($(1)) >/dev/null 2>&1; \ 2757fd251cSMasahiro Yamada then echo "$(2)"; \ 2857fd251cSMasahiro Yamada else echo "$(3)"; \ 2957fd251cSMasahiro Yamada fi) 3057fd251cSMasahiro Yamada 3157fd251cSMasahiro Yamada# as-option 32d5c8d6e0SNick Desaulniers# Usage: aflags-y += $(call as-option,-Wa$(comma)-isa=foo,) 3357fd251cSMasahiro Yamada 3457fd251cSMasahiro Yamadaas-option = $(call try-run,\ 3543fc0a99SNathan Chancellor $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(1) -c -x assembler-with-cpp /dev/null -o "$$TMP",$(1),$(2)) 3657fd251cSMasahiro Yamada 3757fd251cSMasahiro Yamada# as-instr 38d5c8d6e0SNick Desaulniers# Usage: aflags-y += $(call as-instr,instr,option1,option2) 3957fd251cSMasahiro Yamada 4057fd251cSMasahiro Yamadaas-instr = $(call try-run,\ 41*8db4f87fSNathan Chancellor printf "%b\n" "$(1)" | $(CC) -Werror $(CLANG_FLAGS) $(KBUILD_AFLAGS) -Wa$(comma)--fatal-warnings -c -x assembler-with-cpp -o "$$TMP" -,$(2),$(3)) 4257fd251cSMasahiro Yamada 4357fd251cSMasahiro Yamada# __cc-option 4457fd251cSMasahiro Yamada# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) 4557fd251cSMasahiro Yamada__cc-option = $(call try-run,\ 4657fd251cSMasahiro Yamada $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4)) 4757fd251cSMasahiro Yamada 4857fd251cSMasahiro Yamada# cc-option 4957fd251cSMasahiro Yamada# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) 5057fd251cSMasahiro Yamada 5157fd251cSMasahiro Yamadacc-option = $(call __cc-option, $(CC),\ 5257fd251cSMasahiro Yamada $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2)) 5357fd251cSMasahiro Yamada 5457fd251cSMasahiro Yamada# cc-option-yn 5557fd251cSMasahiro Yamada# Usage: flag := $(call cc-option-yn,-march=winchip-c6) 5657fd251cSMasahiro Yamadacc-option-yn = $(call try-run,\ 5757fd251cSMasahiro Yamada $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) 5857fd251cSMasahiro Yamada 5957fd251cSMasahiro Yamada# cc-disable-warning 6057fd251cSMasahiro Yamada# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) 6157fd251cSMasahiro Yamadacc-disable-warning = $(call try-run,\ 6257fd251cSMasahiro Yamada $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) 6357fd251cSMasahiro Yamada 6488b61e3bSNick Desaulniers# gcc-min-version 6588b61e3bSNick Desaulniers# Usage: cflags-$(call gcc-min-version, 70100) += -foo 66fccb3d3eSMasahiro Yamadagcc-min-version = $(call test-ge, $(CONFIG_GCC_VERSION), $1) 6788b61e3bSNick Desaulniers 6888b61e3bSNick Desaulniers# clang-min-version 6988b61e3bSNick Desaulniers# Usage: cflags-$(call clang-min-version, 110000) += -foo 70fccb3d3eSMasahiro Yamadaclang-min-version = $(call test-ge, $(CONFIG_CLANG_VERSION), $1) 7157fd251cSMasahiro Yamada 7257fd251cSMasahiro Yamada# ld-option 7357fd251cSMasahiro Yamada# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y) 7457fd251cSMasahiro Yamadald-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3)) 75