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. "$$TMP" serves as a temporary file and is 21# automatically cleaned up. 22try-run = $(shell set -e; \ 23 TMP=$(TMPOUT)/tmp; \ 24 trap "rm -rf $(TMPOUT)" EXIT; \ 25 mkdir -p $(TMPOUT); \ 26 if ($(1)) >/dev/null 2>&1; \ 27 then echo "$(2)"; \ 28 else echo "$(3)"; \ 29 fi) 30 31# as-option 32# Usage: aflags-y += $(call as-option,-Wa$(comma)-isa=foo,) 33 34as-option = $(call try-run,\ 35 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(1) -c -x assembler-with-cpp /dev/null -o "$$TMP",$(1),$(2)) 36 37# as-instr 38# Usage: aflags-y += $(call as-instr,instr,option1,option2) 39 40as-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 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 = $(if $(call cc-option,$1),y,n) 57 58# cc-disable-warning 59# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) 60cc-disable-warning = $(if $(call cc-option,-W$(strip $1)),-Wno-$(strip $1)) 61 62# gcc-min-version 63# Usage: cflags-$(call gcc-min-version, 70100) += -foo 64gcc-min-version = $(call test-ge, $(CONFIG_GCC_VERSION), $1) 65 66# clang-min-version 67# Usage: cflags-$(call clang-min-version, 110000) += -foo 68clang-min-version = $(call test-ge, $(CONFIG_CLANG_VERSION), $1) 69 70# ld-option 71# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y) 72ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3)) 73 74# __rustc-option 75# Usage: MY_RUSTFLAGS += $(call __rustc-option,$(RUSTC),$(MY_RUSTFLAGS),-Cinstrument-coverage,-Zinstrument-coverage) 76# TODO: remove RUSTC_BOOTSTRAP=1 when we raise the minimum GNU Make version to 4.4 77__rustc-option = $(call try-run,\ 78 echo '#![allow(missing_docs)]#![feature(no_core)]#![no_core]' | RUSTC_BOOTSTRAP=1\ 79 $(1) --sysroot=/dev/null $(filter-out --sysroot=/dev/null,$(2)) $(3)\ 80 --crate-type=rlib --out-dir=$(TMPOUT) --emit=obj=- - >/dev/null,$(3),$(4)) 81 82# rustc-option 83# Usage: rustflags-y += $(call rustc-option,-Cinstrument-coverage,-Zinstrument-coverage) 84rustc-option = $(call __rustc-option, $(RUSTC),\ 85 $(KBUILD_RUSTFLAGS),$(1),$(2)) 86 87# rustc-option-yn 88# Usage: flag := $(call rustc-option-yn,-Cinstrument-coverage) 89rustc-option-yn = $(if $(call rustc-option,$1),y,n) 90