mirror of
https://github.com/linux-msm/laptops-kernel.git
synced 2026-08-13 14:19:53 -07:00
James ClarkandNamhyung Kim
738d0cc77e
Documentation/kbuild/llvm.rst mentions that readelf is included in the LLVM toolchain, but it's not currently included in this block. Add it so that LLVM=... options also apply to readelf. Users in tools/ were Perf which was hardcoding it, and another was the BPF makefile. Both already include Makefile.include so convert them to use the new variables. Where readelf wasn't doing anything arch specific, use HOSTREADELF because it's more likely to be installed. Reviewed-by: Ian Rogers <irogers@google.com> Signed-off-by: James Clark <james.clark@linaro.org> Acked-by: Ihor Solodrai <ihor.solodrai@linux.dev> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
238 lines
8.0 KiB
Makefile
238 lines
8.0 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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ifneq ($(O),)
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ifeq ($(origin O), command line)
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$(if $(shell cd $(PWD); test -d $(O) || echo $(O)),$(error O=$(O) does not exist),)
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ABSOLUTE_O := $(shell cd $(PWD); cd $(O) ; pwd)
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OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/)
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COMMAND_O := O=$(ABSOLUTE_O)
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ifeq ($(objtree),)
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objtree := $(O)
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endif
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endif
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endif
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# check that the output directory actually exists
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ifneq ($(OUTPUT),)
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OUTDIR := $(shell cd $(OUTPUT) && pwd)
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$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
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endif
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#
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# Include saner warnings here, which can catch bugs:
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#
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EXTRA_WARNINGS := -Wbad-function-cast
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EXTRA_WARNINGS += -Wdeclaration-after-statement
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EXTRA_WARNINGS += -Wformat-security
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EXTRA_WARNINGS += -Wformat-y2k
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EXTRA_WARNINGS += -Winit-self
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EXTRA_WARNINGS += -Wmissing-declarations
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EXTRA_WARNINGS += -Wmissing-prototypes
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EXTRA_WARNINGS += -Wnested-externs
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EXTRA_WARNINGS += -Wno-system-headers
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EXTRA_WARNINGS += -Wold-style-definition
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EXTRA_WARNINGS += -Wpacked
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EXTRA_WARNINGS += -Wredundant-decls
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EXTRA_WARNINGS += -Wstrict-prototypes
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EXTRA_WARNINGS += -Wswitch-default
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EXTRA_WARNINGS += -Wswitch-enum
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EXTRA_WARNINGS += -Wundef
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EXTRA_WARNINGS += -Wwrite-strings
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EXTRA_WARNINGS += -Wformat
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EXTRA_WARNINGS += -Wno-type-limits
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# Makefiles suck: This macro sets a default value of $(2) for the
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# variable named by $(1), unless the variable has been set by
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# environment or command line. This is necessary for CC and AR
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# because make sets default values, so the simpler ?= approach
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# won't work as expected.
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define allow-override
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$(if $(or $(findstring environment,$(origin $(1))),\
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$(findstring command line,$(origin $(1)))),,\
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$(eval $(1) = $(2)))
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endef
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ifneq ($(LLVM),)
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ifneq ($(filter %/,$(LLVM)),)
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LLVM_PREFIX := $(LLVM)
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else ifneq ($(filter -%,$(LLVM)),)
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LLVM_SUFFIX := $(LLVM)
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else ifneq ($(LLVM),1)
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$(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst)
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endif
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$(call allow-override,CC,$(LLVM_PREFIX)clang$(LLVM_SUFFIX))
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$(call allow-override,CLANG,$(LLVM_PREFIX)clang$(LLVM_SUFFIX))
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$(call allow-override,HOSTCC,$(LLVM_PREFIX)clang$(LLVM_SUFFIX))
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$(call allow-override,AR,$(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX))
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$(call allow-override,HOSTAR,$(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX))
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$(call allow-override,LD,$(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX))
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$(call allow-override,HOSTLD,$(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX))
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$(call allow-override,CXX,$(LLVM_PREFIX)clang++$(LLVM_SUFFIX))
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$(call allow-override,STRIP,$(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX))
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$(call allow-override,LLVM_STRIP,$(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX))
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$(call allow-override,LLC,$(LLVM_PREFIX)llc$(LLVM_SUFFIX))
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$(call allow-override,LLVM_CONFIG,$(LLVM_PREFIX)llvm-config$(LLVM_SUFFIX))
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$(call allow-override,LLVM_OBJCOPY,$(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX))
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$(call allow-override,READELF,$(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX))
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$(call allow-override,HOSTREADELF,$(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX))
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else
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# Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix.
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$(call allow-override,CC,$(CROSS_COMPILE)gcc)
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$(call allow-override,AR,$(CROSS_COMPILE)ar)
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$(call allow-override,LD,$(CROSS_COMPILE)ld)
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$(call allow-override,CXX,$(CROSS_COMPILE)g++)
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$(call allow-override,STRIP,$(CROSS_COMPILE)strip)
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$(call allow-override,READELF,$(CROSS_COMPILE)readelf)
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# Host versions aren't prefixed
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$(call allow-override,HOSTAR,ar)
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$(call allow-override,HOSTCC,gcc)
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$(call allow-override,HOSTLD,ld)
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$(call allow-override,HOSTREADELF,readelf)
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# Some tools still require Clang, LLC and/or LLVM utils
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$(call allow-override,CLANG,clang)
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$(call allow-override,LLC,llc)
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$(call allow-override,LLVM_CONFIG,llvm-config)
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$(call allow-override,LLVM_OBJCOPY,llvm-objcopy)
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$(call allow-override,LLVM_STRIP,llvm-strip)
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endif
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CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)
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# Some tools require bpftool
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SYSTEM_BPFTOOL ?= bpftool
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RUSTC ?= rustc
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ifeq ($(CC_NO_CLANG), 1)
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EXTRA_WARNINGS += -Wstrict-aliasing=3
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else ifneq ($(CROSS_COMPILE),)
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# Allow userspace to override CLANG_CROSS_FLAGS to specify their own
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# sysroots and flags or to avoid the GCC call in pure Clang builds.
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ifeq ($(CLANG_CROSS_FLAGS),)
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CLANG_TARGET := $(notdir $(CROSS_COMPILE:%-=%))
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CLANG_TARGET := $(subst s390-linux,s390x-linux,$(CLANG_TARGET))
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CLANG_CROSS_FLAGS := --target=$(CLANG_TARGET)
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GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)gcc 2>/dev/null))
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ifneq ($(GCC_TOOLCHAIN_DIR),)
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CLANG_CROSS_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
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CLANG_CROSS_FLAGS += --sysroot=$(shell $(CROSS_COMPILE)gcc -print-sysroot)
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CLANG_CROSS_FLAGS += --gcc-toolchain=$(realpath $(GCC_TOOLCHAIN_DIR)/..)
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endif # GCC_TOOLCHAIN_DIR
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endif # CLANG_CROSS_FLAGS
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CFLAGS += $(CLANG_CROSS_FLAGS)
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AFLAGS += $(CLANG_CROSS_FLAGS)
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else
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CLANG_CROSS_FLAGS :=
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endif # CROSS_COMPILE
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# Hack to avoid type-punned warnings on old systems such as RHEL5:
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# We should be changing CFLAGS and checking gcc version, but this
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# will do for now and keep the above -Wstrict-aliasing=3 in place
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# in newer systems.
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# Needed for the __raw_cmpxchg in tools/arch/x86/include/asm/cmpxchg.h
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#
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# See https://lore.kernel.org/lkml/9a8748490611281710g78402fbeh8ff7fcc162dbcbca@mail.gmail.com/
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# and https://gcc.gnu.org/gcc-4.8/changes.html,
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# that takes into account Linus's comments (search for Wshadow) for the reasoning about
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# -Wshadow not being interesting before gcc 4.8.
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ifneq ($(filter 3.%,$(MAKE_VERSION)),) # make-3
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EXTRA_WARNINGS += -fno-strict-aliasing
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EXTRA_WARNINGS += -Wno-shadow
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else
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EXTRA_WARNINGS += -Wshadow
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endif
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ifneq ($(findstring $(MAKEFLAGS), w),w)
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PRINT_DIR = --no-print-directory
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else
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NO_SUBDIR = :
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endif
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# Beautify output
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# ---------------------------------------------------------------------------
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#
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# Most of build commands in Kbuild start with "cmd_". You can optionally define
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# "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
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# that command is printed by default.
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#
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# e.g.)
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# quiet_cmd_depmod = DEPMOD $(MODLIB)
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# cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
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#
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# A simple variant is to prefix commands with $(Q) - that's useful
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# for commands that shall be hidden in non-verbose mode.
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#
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# $(Q)$(MAKE) $(build)=scripts/basic
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#
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# To put more focus on warnings, be less verbose as default
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# Use 'make V=1' to see the full commands
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ifeq ($(V),1)
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quiet =
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Q =
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else
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quiet = quiet_
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Q = @
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endif
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# If the user is running make -s (silent mode), suppress echoing of commands
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# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
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ifeq ($(filter 3.%,$(MAKE_VERSION)),)
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short-opts := $(firstword -$(MAKEFLAGS))
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else
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short-opts := $(filter-out --%,$(MAKEFLAGS))
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endif
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ifneq ($(findstring s,$(short-opts)),)
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silent=1
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quiet=silent_
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endif
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export quiet Q
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#
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# Define a callable command for descending to a new directory
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#
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# Call by doing: $(call descend,directory[,target])
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#
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descend = \
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+mkdir -p $(OUTPUT)$(1) && \
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$(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
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QUIET_SUBDIR0 = +$(MAKE) $(COMMAND_O) -C # space to separate -C and subdir
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QUIET_SUBDIR1 =
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ifneq ($(silent),1)
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ifneq ($(V),1)
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QUIET_CC = @echo ' CC '$@;
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QUIET_CC_FPIC = @echo ' CC FPIC '$@;
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QUIET_CLANG = @echo ' CLANG '$@;
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QUIET_AR = @echo ' AR '$@;
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QUIET_LINK = @echo ' LINK '$@;
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QUIET_MKDIR = @echo ' MKDIR '$@;
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QUIET_GEN = @echo ' GEN '$@;
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QUIET_SUBDIR0 = +@subdir=
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QUIET_SUBDIR1 = ;$(NO_SUBDIR) \
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echo ' SUBDIR '$$subdir; \
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$(MAKE) $(PRINT_DIR) -C $$subdir
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QUIET_FLEX = @echo ' FLEX '$@;
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QUIET_BISON = @echo ' BISON '$@;
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QUIET_GENSKEL = @echo ' GENSKEL '$@;
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descend = \
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+@echo ' DESCEND '$(1); \
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mkdir -p $(OUTPUT)$(1) && \
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$(MAKE) $(COMMAND_O) subdir=$(if $(subdir),$(subdir)/$(1),$(1)) $(PRINT_DIR) -C $(1) $(2)
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QUIET_CLEAN = @printf ' CLEAN %s\n' $1;
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QUIET_INSTALL = @printf ' INSTALL %s\n' $1;
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QUIET_UNINST = @printf ' UNINST %s\n' $1;
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endif
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endif
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pound := \#
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