# Most importantly: sub-Makefiles should only ever modify files in
# their own directory. If in some directory we have a dependency on
# a file in another dir (which doesn't happen often, but it's often
-# unavoidable when linking the built-in.o targets which finally
+# unavoidable when linking the built-in.a targets which finally
# turn into vmlinux), we will call a sub make in that other dir, and
# after that we are sure that everything which is in that other dir
# is now up to date.
$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
@:
-sub-make: FORCE
+sub-make:
$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
HOSTCC = gcc
HOSTCXX = g++
-HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
+HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89 -pipe
HOSTCXXFLAGS = -O2
# Decide whether to build built-in, modular, or both.
# Make variables (CC, etc...)
AS = $(CROSS_COMPILE)as
LD = $(CROSS_COMPILE)ld
+LDLLD = ld.lld
CC = $(CROSS_COMPILE)gcc
CPP = $(CC) -E
AR = $(CROSS_COMPILE)ar
CFLAGS_KERNEL =
AFLAGS_KERNEL =
CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
+CFLAGS_KCOV = -fsanitize-coverage=trace-pc
# Use USERINCLUDE when you must reference the UAPI directories only.
KBUILD_CPPFLAGS := -D__KERNEL__
-KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
+KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -pipe \
-fno-strict-aliasing -fno-common \
-Werror-implicit-function-declaration \
-Wno-format-security \
-std=gnu89 $(call cc-option,-fno-PIE)
-
+ifeq ($(TARGET_BOARD_TYPE),auto)
+KBUILD_CFLAGS += -DCONFIG_PLATFORM_AUTO
+endif
KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
-export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE
+export CFLAGS_KASAN CFLAGS_UBSAN CFLAGS_KASAN_NOSANITIZE
+export CFLAGS_KCOV
export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
ifeq ($(cc-name),clang)
ifneq ($(CROSS_COMPILE),)
-CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%))
+CLANG_TRIPLE ?= $(CROSS_COMPILE)
+CLANG_TARGET := --target=$(notdir $(CLANG_TRIPLE:%-=%))
+ifeq ($(shell $(srctree)/scripts/clang-android.sh $(CC) $(CLANG_TARGET)), y)
+$(error "Clang with Android --target detected. Did you specify CLANG_TRIPLE?")
+endif
GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
CLANG_PREFIX := --prefix=$(GCC_TOOLCHAIN_DIR)
GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
endif
+# Make toolchain changes before including arch/$(SRCARCH)/Makefile to ensure
+# ar/cc/ld-* macros return correct values.
+ifdef CONFIG_LTO_CLANG
+# use LLVM linker LLD for LTO linking and vmlinux_link
+LD := $(LDLLD)
+# use llvm-ar for building symbol tables from IR files, and llvm-nm instead
+# of objdump for processing symbol versions and exports
+LLVM_AR := llvm-ar
+LLVM_NM := llvm-nm
+export LLVM_AR LLVM_NM
+endif
+
+ifeq ($(cc-name),clang)
+ifeq ($(ld-name),lld)
+KBUILD_CFLAGS += -fuse-ld=lld
+LDFLAGS += -O2
+endif
+KBUILD_CPPFLAGS += -Qunused-arguments
+endif
+
# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
# values of the respective KBUILD_* variables
ARCH_CPPFLAGS :=
ARCH_CFLAGS :=
include arch/$(SRCARCH)/Makefile
+ifeq ($(cc-name),clang)
+KBUILD_CFLAGS += -O3
+KBUILD_CFLAGS += $(call cc-option, -mllvm -polly) \
+ $(call cc-option, -mllvm -polly-run-dce) \
+ $(call cc-option, -mllvm -polly-run-inliner) \
+ $(call cc-option, -mllvm -polly-opt-fusion=max) \
+ $(call cc-option, -mllvm -polly-ast-use-context) \
+ $(call cc-option, -mllvm -polly-detect-keep-going) \
+ $(call cc-option, -mllvm -polly-vectorizer=stripmine) \
+ $(call cc-option, -mllvm -polly-invariant-load-hoisting)
+else
+KBUILD_CFLAGS += -O2
+endif
+
+ifeq ($(cc-name),gcc)
+KBUILD_CFLAGS += -mcpu=cortex-a73.cortex-a53
+KBUILD_AFLAGS += -mcpu=cortex-a73.cortex-a53
+endif
+ifeq ($(cc-name),clang)
+KBUILD_CFLAGS += -mcpu=cortex-a53
+KBUILD_AFLAGS += -mcpu=cortex-a53
+endif
+
KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
KBUILD_CFLAGS += $(call cc-disable-warning, attribute-alias)
-ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
-KBUILD_CFLAGS += -Os
-else
-ifdef CONFIG_PROFILE_ALL_BRANCHES
-KBUILD_CFLAGS += -O2
-else
-KBUILD_CFLAGS += -O2
-endif
+ifdef CONFIG_CC_WERROR
+KBUILD_CFLAGS += -Werror
endif
# Tell gcc to never replace conditional load with a non-conditional one
endif
KBUILD_CFLAGS += $(stackp-flag)
+ifdef CONFIG_KCOV
+ ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
+ $(warning Cannot use CONFIG_KCOV: \
+ -fsanitize-coverage=trace-pc is not supported by compiler)
+ CFLAGS_KCOV =
+ endif
+endif
+
ifeq ($(cc-name),clang)
-KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
+KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
# Quiet clang warning: comparison of unsigned expression < 0 is always false
KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
# source of a reference will be _MergedGlobals and not on of the whitelisted names.
# See modpost pattern 2
KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
-KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
else
# These warnings generated too much noise in a regular build.
endif
endif
+# Initialize all stack variables with a pattern, if desired.
+ifdef CONFIG_INIT_STACK_ALL
+KBUILD_CFLAGS += $(call cc-option, -ftrivial-auto-var-init=pattern)
+endif
+
KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
ifdef CONFIG_DEBUG_INFO
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif
+ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
+KBUILD_CFLAGS_KERNEL += $(call cc-option,-ffunction-sections,)
+KBUILD_CFLAGS_KERNEL += $(call cc-option,-fdata-sections,)
+endif
+
+ifdef CONFIG_LTO_CLANG
+ifdef CONFIG_THINLTO
+lto-clang-flags := -flto=thin
+LDFLAGS += --thinlto-cache-dir=.thinlto-cache
+else
+lto-clang-flags := -flto
+endif
+lto-clang-flags += -fvisibility=hidden
+
+# allow disabling only clang LTO where needed
+DISABLE_LTO_CLANG := -fno-lto -fvisibility=default
+export DISABLE_LTO_CLANG
+endif
+
+ifdef CONFIG_LTO
+LTO_CFLAGS := $(lto-clang-flags)
+KBUILD_CFLAGS += $(LTO_CFLAGS)
+
+DISABLE_LTO := $(DISABLE_LTO_CLANG)
+export LTO_CFLAGS DISABLE_LTO
+endif
+
# arch Makefile may override CC so keep this after arch Makefile is included
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
CHECKFLAGS += $(NOSTDINC_FLAGS)
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
+include scripts/Makefile.ubsan
# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
# last assignments
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
+ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
+LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
+endif
+
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
LDFLAGS_vmlinux += $(call ld-option, -X,)
endif
vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
$(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
-init-y := $(patsubst %/, %/built-in.o, $(init-y))
-core-y := $(patsubst %/, %/built-in.o, $(core-y))
-drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
-net-y := $(patsubst %/, %/built-in.o, $(net-y))
+init-y := $(patsubst %/, %/built-in.a, $(init-y))
+core-y := $(patsubst %/, %/built-in.a, $(core-y))
+drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
+net-y := $(patsubst %/, %/built-in.a, $(net-y))
libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
-libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
-libs-y := $(libs-y1) $(libs-y2)
-virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
+libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
+virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
# Externally visible symbols (used by link-vmlinux.sh)
export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
-export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
+export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
+export KBUILD_VMLINUX_LIBS := $(libs-y1)
export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
export LDFLAGS_vmlinux
# used by scripts/pacmage/Makefile
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
-vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
+vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
# Final link of vmlinux
cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
PHONY += $(vmlinux-dirs)
$(vmlinux-dirs): prepare scripts
- $(Q)$(MAKE) $(build)=$@
+ $(Q)$(MAKE) $(build)=$@ need-builtin=1
define filechk_kernel.release
echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
archprepare: archheaders archscripts prepare1 scripts_basic
-prepare0: archprepare FORCE
+prepare0: archprepare
$(Q)$(MAKE) $(build)=.
# All the preparing..
prepare: prepare0
+# Make sure we're using a supported toolchain with LTO_CLANG
+ifdef CONFIG_LTO_CLANG
+ ifneq ($(call clang-ifversion, -ge, 0800, y), y)
+ @echo Cannot use CONFIG_LTO_CLANG: requires clang 8.0 or later >&2 && exit 1
+ endif
+ ifneq ($(ld-name),lld)
+ @echo Cannot use CONFIG_LTO_CLANG: requires LLD >&2 && exit 1
+ endif
+endif
+# Make sure compiler supports LTO flags
+ifdef lto-flags
+ ifeq ($(call cc-option, $(lto-flags)),)
+ @echo Cannot use CONFIG_LTO: $(lto-flags) not supported by compiler \
+ >&2 && exit 1
+ endif
+endif
+
# Generate some files
# ---------------------------------------------------------------------------
export INSTALL_FW_PATH
PHONY += firmware_install
-firmware_install: FORCE
+firmware_install:
@mkdir -p $(objtree)/firmware
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
archscripts:
PHONY += __headers
-__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
+__headers: $(version_h) scripts_basic asm-generic archheaders archscripts
$(Q)$(MAKE) $(build)=scripts build_unifdef
PHONY += headers_install_all
-o -name '*.symtypes' -o -name 'modules.order' \
-o -name modules.builtin -o -name '.tmp_*.o.*' \
-o -name '*.ll' \
- -o -name '*.gcno' \) -type f -print | xargs rm -f
+ -o -name '*.gcno' \
+ -o -name '*.*.symversions' \) -type f -print | xargs rm -f
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