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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231# SPDX-License-Identifier: GPL-2.0ifneq ($(O),)ifeq ($(origin O), command line) $(if $(shell cd $(PWD); test -d $(O) || echo $(O)),$(error O=$(O) does not exist),) ABSOLUTE_O := $(shell cd $(PWD); cd $(O) ; pwd) OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/) COMMAND_O := O=$(ABSOLUTE_O)ifeq ($(objtree),) objtree := $(O)endifendifendif
# check that the output directory actually existsifneq ($(OUTPUT),)OUTDIR := $(shell cd $(OUTPUT) && pwd)$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))endif
## Include saner warnings here, which can catch bugs:#EXTRA_WARNINGS := -Wbad-function-castEXTRA_WARNINGS += -Wdeclaration-after-statementEXTRA_WARNINGS += -Wformat-securityEXTRA_WARNINGS += -Wformat-y2kEXTRA_WARNINGS += -Winit-selfEXTRA_WARNINGS += -Wmissing-declarationsEXTRA_WARNINGS += -Wmissing-prototypesEXTRA_WARNINGS += -Wnested-externsEXTRA_WARNINGS += -Wno-system-headersEXTRA_WARNINGS += -Wold-style-definitionEXTRA_WARNINGS += -WpackedEXTRA_WARNINGS += -Wredundant-declsEXTRA_WARNINGS += -Wstrict-prototypesEXTRA_WARNINGS += -Wswitch-defaultEXTRA_WARNINGS += -Wswitch-enumEXTRA_WARNINGS += -WundefEXTRA_WARNINGS += -Wwrite-stringsEXTRA_WARNINGS += -WformatEXTRA_WARNINGS += -Wno-type-limits
# Makefiles suck: This macro sets a default value of $(2) for the# variable named by $(1), unless the variable has been set by# environment or command line. This is necessary for CC and AR# because make sets default values, so the simpler ?= approach# won't work as expected.define allow-override $(if $(or $(findstring environment,$(origin $(1))),\ $(findstring command line,$(origin $(1)))),,\ $(eval $(1) = $(2)))endef
ifneq ($(LLVM),)ifneq ($(filter %/,$(LLVM)),)LLVM_PREFIX := $(LLVM)else ifneq ($(filter -%,$(LLVM)),)LLVM_SUFFIX := $(LLVM)else ifneq ($(LLVM),1)$(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst)endif
$(call allow-override,CC,$(LLVM_PREFIX)clang$(LLVM_SUFFIX))$(call allow-override,AR,$(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX))$(call allow-override,LD,$(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX))$(call allow-override,CXX,$(LLVM_PREFIX)clang++$(LLVM_SUFFIX))$(call allow-override,STRIP,$(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX))else# Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix.$(call allow-override,CC,$(CROSS_COMPILE)gcc)$(call allow-override,AR,$(CROSS_COMPILE)ar)$(call allow-override,LD,$(CROSS_COMPILE)ld)$(call allow-override,CXX,$(CROSS_COMPILE)g++)$(call allow-override,STRIP,$(CROSS_COMPILE)strip)endif
CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)
ifneq ($(LLVM),)HOSTAR ?= $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)HOSTCC ?= $(LLVM_PREFIX)clang$(LLVM_SUFFIX)HOSTLD ?= $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)elseHOSTAR ?= arHOSTCC ?= gccHOSTLD ?= ldendif
# Some tools require Clang, LLC and/or LLVM utilsCLANG ?= clangLLC ?= llcLLVM_CONFIG ?= llvm-configLLVM_OBJCOPY ?= llvm-objcopyLLVM_STRIP ?= llvm-strip
# Some tools require bpftoolSYSTEM_BPFTOOL ?= bpftool
RUSTC ?= rustc
ifeq ($(CC_NO_CLANG), 1)EXTRA_WARNINGS += -Wstrict-aliasing=3
else ifneq ($(CROSS_COMPILE),)# Allow userspace to override CLANG_CROSS_FLAGS to specify their own# sysroots and flags or to avoid the GCC call in pure Clang builds.ifeq ($(CLANG_CROSS_FLAGS),)CLANG_TARGET := $(notdir $(CROSS_COMPILE:%-=%))CLANG_TARGET := $(subst s390-linux,s390x-linux,$(CLANG_TARGET))CLANG_CROSS_FLAGS := --target=$(CLANG_TARGET)GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)gcc 2>/dev/null))ifneq ($(GCC_TOOLCHAIN_DIR),)CLANG_CROSS_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))CLANG_CROSS_FLAGS += --sysroot=$(shell $(CROSS_COMPILE)gcc -print-sysroot)CLANG_CROSS_FLAGS += --gcc-toolchain=$(realpath $(GCC_TOOLCHAIN_DIR)/..)endif # GCC_TOOLCHAIN_DIRendif # CLANG_CROSS_FLAGSCFLAGS += $(CLANG_CROSS_FLAGS)AFLAGS += $(CLANG_CROSS_FLAGS)elseCLANG_CROSS_FLAGS :=endif # CROSS_COMPILE
# Hack to avoid type-punned warnings on old systems such as RHEL5:# We should be changing CFLAGS and checking gcc version, but this# will do for now and keep the above -Wstrict-aliasing=3 in place# in newer systems.# Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h## See https://lore.kernel.org/lkml/9a8748490611281710g78402fbeh8ff7fcc162dbcbca@mail.gmail.com/# and https://gcc.gnu.org/gcc-4.8/changes.html,# that takes into account Linus's comments (search for Wshadow) for the reasoning about# -Wshadow not being interesting before gcc 4.8.
ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3EXTRA_WARNINGS += -fno-strict-aliasingEXTRA_WARNINGS += -Wno-shadowelseEXTRA_WARNINGS += -Wshadowendif
ifneq ($(findstring $(MAKEFLAGS), w),w)PRINT_DIR = --no-print-directoryelseNO_SUBDIR = :endif
# Beautify output# ---------------------------------------------------------------------------## Most of build commands in Kbuild start with "cmd_". You can optionally define# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from# that command is printed by default.## e.g.)# quiet_cmd_depmod = DEPMOD $(MODLIB)# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)## A simple variant is to prefix commands with $(Q) - that's useful# for commands that shall be hidden in non-verbose mode.## $(Q)$(MAKE) $(build)=scripts/basic## To put more focus on warnings, be less verbose as default# Use 'make V=1' to see the full commands
ifeq ($(V),1) quiet = Q =else quiet = quiet_ Q = @endif
# If the user is running make -s (silent mode), suppress echoing of commands# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.ifeq ($(filter 3.%,$(MAKE_VERSION)),)short-opts := $(firstword -$(MAKEFLAGS))elseshort-opts := $(filter-out --%,$(MAKEFLAGS))endif
ifneq ($(findstring s,$(short-opts)),) silent=1 quiet=silent_endif
export quiet Q
## Define a callable command for descending to a new directory## Call by doing: $(call descend,directory[,target])#descend = \ +mkdir -p $(OUTPUT)$(1) && \ $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdirQUIET_SUBDIR1 =
ifneq ($(silent),1) ifneq ($(V),1) QUIET_CC = @echo ' CC '$@; QUIET_CC_FPIC = @echo ' CC FPIC '$@; QUIET_CLANG = @echo ' CLANG '$@; QUIET_AR = @echo ' AR '$@; QUIET_LINK = @echo ' LINK '$@; QUIET_MKDIR = @echo ' MKDIR '$@; QUIET_GEN = @echo ' GEN '$@; QUIET_SUBDIR0 = +@subdir= QUIET_SUBDIR1 = ;$(NO_SUBDIR) \ echo ' SUBDIR '$$subdir; \ $(MAKE) $(PRINT_DIR) -C $$subdir QUIET_FLEX = @echo ' FLEX '$@; QUIET_BISON = @echo ' BISON '$@; QUIET_GENSKEL = @echo ' GENSKEL '$@;
descend = \ +@echo ' DESCEND '$(1); \ mkdir -p $(OUTPUT)$(1) && \ $(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
QUIET_CLEAN = @printf ' CLEAN %s\n' $1; QUIET_INSTALL = @printf ' INSTALL %s\n' $1; QUIET_UNINST = @printf ' UNINST %s\n' $1; endifendif
pound := \#