1*57fd251cSMasahiro Yamada# SPDX-License-Identifier: GPL-2.0-only 2*57fd251cSMasahiro Yamada 3*57fd251cSMasahiro Yamada# cc-cross-prefix 4*57fd251cSMasahiro Yamada# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) 5*57fd251cSMasahiro Yamada# Return first <prefix> where a <prefix>gcc is found in PATH. 6*57fd251cSMasahiro Yamada# If no gcc found in PATH with listed prefixes return nothing 7*57fd251cSMasahiro Yamada# 8*57fd251cSMasahiro Yamada# Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it 9*57fd251cSMasahiro Yamada# would try to directly execute the shell builtin 'command'. This workaround 10*57fd251cSMasahiro Yamada# should be kept for a long time since this issue was fixed only after the 11*57fd251cSMasahiro Yamada# GNU Make 4.2.1 release. 12*57fd251cSMasahiro Yamadacc-cross-prefix = $(firstword $(foreach c, $(1), \ 13*57fd251cSMasahiro Yamada $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c)))) 14*57fd251cSMasahiro Yamada 15*57fd251cSMasahiro Yamada# output directory for tests below 16*57fd251cSMasahiro YamadaTMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$ 17*57fd251cSMasahiro Yamada 18*57fd251cSMasahiro Yamada# try-run 19*57fd251cSMasahiro Yamada# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) 20*57fd251cSMasahiro Yamada# Exit code chooses option. "$$TMP" serves as a temporary file and is 21*57fd251cSMasahiro Yamada# automatically cleaned up. 22*57fd251cSMasahiro Yamadatry-run = $(shell set -e; \ 23*57fd251cSMasahiro Yamada TMP=$(TMPOUT)/tmp; \ 24*57fd251cSMasahiro Yamada TMPO=$(TMPOUT)/tmp.o; \ 25*57fd251cSMasahiro Yamada mkdir -p $(TMPOUT); \ 26*57fd251cSMasahiro Yamada trap "rm -rf $(TMPOUT)" EXIT; \ 27*57fd251cSMasahiro Yamada if ($(1)) >/dev/null 2>&1; \ 28*57fd251cSMasahiro Yamada then echo "$(2)"; \ 29*57fd251cSMasahiro Yamada else echo "$(3)"; \ 30*57fd251cSMasahiro Yamada fi) 31*57fd251cSMasahiro Yamada 32*57fd251cSMasahiro Yamada# as-option 33*57fd251cSMasahiro Yamada# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) 34*57fd251cSMasahiro Yamada 35*57fd251cSMasahiro Yamadaas-option = $(call try-run,\ 36*57fd251cSMasahiro Yamada $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) 37*57fd251cSMasahiro Yamada 38*57fd251cSMasahiro Yamada# as-instr 39*57fd251cSMasahiro Yamada# Usage: cflags-y += $(call as-instr,instr,option1,option2) 40*57fd251cSMasahiro Yamada 41*57fd251cSMasahiro Yamadaas-instr = $(call try-run,\ 42*57fd251cSMasahiro Yamada printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) 43*57fd251cSMasahiro Yamada 44*57fd251cSMasahiro Yamada# __cc-option 45*57fd251cSMasahiro Yamada# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) 46*57fd251cSMasahiro Yamada__cc-option = $(call try-run,\ 47*57fd251cSMasahiro Yamada $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4)) 48*57fd251cSMasahiro Yamada 49*57fd251cSMasahiro Yamada# cc-option 50*57fd251cSMasahiro Yamada# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) 51*57fd251cSMasahiro Yamada 52*57fd251cSMasahiro Yamadacc-option = $(call __cc-option, $(CC),\ 53*57fd251cSMasahiro Yamada $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2)) 54*57fd251cSMasahiro Yamada 55*57fd251cSMasahiro Yamada# cc-option-yn 56*57fd251cSMasahiro Yamada# Usage: flag := $(call cc-option-yn,-march=winchip-c6) 57*57fd251cSMasahiro Yamadacc-option-yn = $(call try-run,\ 58*57fd251cSMasahiro Yamada $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) 59*57fd251cSMasahiro Yamada 60*57fd251cSMasahiro Yamada# cc-disable-warning 61*57fd251cSMasahiro Yamada# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) 62*57fd251cSMasahiro Yamadacc-disable-warning = $(call try-run,\ 63*57fd251cSMasahiro Yamada $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) 64*57fd251cSMasahiro Yamada 65*57fd251cSMasahiro Yamada# cc-ifversion 66*57fd251cSMasahiro Yamada# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) 67*57fd251cSMasahiro Yamadacc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4)) 68*57fd251cSMasahiro Yamada 69*57fd251cSMasahiro Yamada# ld-option 70*57fd251cSMasahiro Yamada# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y) 71*57fd251cSMasahiro Yamadald-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3)) 72*57fd251cSMasahiro Yamada 73*57fd251cSMasahiro Yamada# ld-ifversion 74*57fd251cSMasahiro Yamada# Usage: $(call ld-ifversion, -ge, 22252, y) 75*57fd251cSMasahiro Yamadald-ifversion = $(shell [ $(CONFIG_LD_VERSION)0 $(1) $(2)0 ] && echo $(3) || echo $(4)) 76