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|
-include Kbuild
# Disable builti-n rules and variables
MAKEFLAGS += -r -R
# Disable output of entering/leaving directory messages
MAKEFLAGS += --no-print-directory
export MSG = @printf '\033[34m%-8s\033[0m %s\n'
this-makefile = $(lastword $(MAKEFILE_LIST))
srctree = $(realpath $(dir $(this-makefile)))
.DEFAULT_GOAL := all
ifndef ARCH
ARCH := x86_64
endif
ifeq ($(CCACHE),1)
CC := ccache $(CC)
endif
ifndef O
O := $(srctree)/dist
else
O := $(srctree)/$(O)
endif
export CC LD AR STRIP CROSS_COMPILE ARCH O
ifeq ($(V),1)
Q :=
else
Q := @
MAKEFLAGS += -s
endif
ifdef M
obj = $(M)/
endif
KCONFIG_CONFIG ?= .config
-include ${KCONFIG_CONFIG}
ifneq ($(CONFIG_LLVM),y)
ifneq ($(filter %/,$(LLVM)),)
LLVM_PREFIX = $(LLVM)
else ifneq ($(filter -%,$(LLVM)),)
LLVM_SUFFIX = $(LLVM)
endif
endif
ifeq ($(CONFIG_LLVM),y)
CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
else
CC = $(CROSS_COMPILE)gcc
LD = $(CROSS_COMPILE)ld
AR = $(CROSS_COMPILE)ar
STRIP = $(CROSS_COMPILE)strip
endif
KBUILD_CFLAGS := -x c
KBUILD_CFLAGS += -Wall -Wextra
KBUILD_CFLAGS += -nostdinc
KBUILD_CFLAGS += -target $(ARCH)-linux-eabi
KBUILD_CFLAGS += -ffreestanding
KBUILD_CFLAGS += -I$(srctree)/include
KBUILD_CFLAGS += -I$(srctree)/include/arch/$(ARCH)
KBUILD_CFLAGS += -std=c23
KBUILD_CFLAGS += -fno-common
KBUILD_CFLAGS += -fno-PIE
KBUILD_CFLAGS += -fstrict-aliasing
KBUILD_CFLAGS += -fno-delete-null-pointer-checks
# Disable overflow optimizations
KBUILD_CFLAGS += -fno-strict-overflow
# Disable stack check
KBUILD_CFLAGS += -fno-stack-check
# Weird loops transformations to wcslen
KBUILD_CFLAGS += -fno-builtin-wcslen
ifeq ($(CONFIG_WERROR),y)
KBUILD_CFLAGS += -Werror
endif
KBUILD_LDFLAGS :=
KBUILD_ASFLAGS :=
ifeq ($(CONFIG_DEBUG),y)
KBUILD_CFLAGS += -g
else
KBUILD_CFLAGS += -fdata-sections -ffunction-sections
KBUILD_CFLAGS += -fno-unwind-tables -fomit-frame-pointer
KBUILD_CFLAGS += -flto
KBUILD_LDFLAGS += --gc-sections
KBUILD_LDFLAGS += --build-id=none
KBUILD_LDFLAGS += --as-needed
# KBUILD_LDFLAGS += --strip-all
KBUILD_LDFLAGS += -z relro -z now -z noexecstack
KBUILD_LDFLAGS += --no-undefined
KBUILD_LDFLAGS += --icf=all
KBUILD_ASFLAGS +=
endif
# Assembly does not need -nostdinc; clang warns it is unused.
KBUILD_ASFLAGS += -target $(ARCH)-linux-eabi
KBUILD_ASFLAGS += -I$(srctree)/include
KUILD_ASFLAGS += -I$(srctree)/include/arch/$(ARCH)
ifdef CONFIG_OPTIMIZATION_LEVEL_O0
KBUILD_CFLAGS += -O0
else ifdef CONFIG_OPTIMIZATION_LEVEL_G
KBUILD_CFLAGS += -Og
else ifdef CONFIG_OPTIMIZATION_LEVEL_O1
KBUILD_CFLAGS += -O1
else ifdef CONFIG_OPTIMIZATION_LEVEL_O2
KBUILD_CFLAGS += -O2
else ifdef CONFIG_OPTIMIZATION_LEVEL_O3
KBUILD_CFLAGS += -O3
else ifdef CONFIG_OPTIMIZATION_LEVEL_Os
KBUILD_CFLAGS += -Os
else ifdef CONFIG_OPTIMIZATION_LEVEL_Oz
KBUILD_CFLAGS += -Oz
else ifdef CONFIG_OPTIMIZATION_LEVEL_FAST
KBUILD_CFLAGS += -Ofast
endif
PHONY :=
export Q srctree MAKEFLAGS KCONFIG_CONFIG \
KBUILD_CFLAGS KBUILD_ASFLAGS KBUILD_LDFLAGS
PHONY += install
all:
$(Q)$(MAKE) -f scripts/makefile.build obj=$(obj)
PHONY += install
install: all
$(Q)$(MAKE) -f scripts/makefile.build obj=$(obj) install
ifdef CONFIG_LIB_LIBC_HEADERS
mkdir -p $(O)/usr
cp -r $(srctree)/include $(O)/usr/
rm -rf $(O)/usr/include/arch $(O)/usr/include/generated ${O}/usr/include/config
endif
PHONY += clean
clean:
$(Q)$(MAKE) -f scripts/makefile.build obj=$(obj) clean
$(Q)rm -f $(srctree)/include/config/auto.conf
$(Q)rm -f $(srctree)/include/generated/autoconf.h
$(Q)rm -rf $(srctree)/dist
PHONY += distclean
distclean: clean
$(Q)$(MAKE) -C scripts/kconfig clean
$(KCONFIG_CONFIG):
@echo >&2 '***'
@echo >&2 '*** Configuration file "$@" not found!'
@echo >&2 '***'
@echo >&2 '*** Please run some configurator'
@echo >&2 '*** (e.g. "make oldconfig" or "make menuconfig"'
@echo >&2 '***'
@false
PHONY += help
help:
@echo "Available make targets:"
@echo " all - Build the project (default)"
@echo " clang-format - Format source files using clang-format"
@echo " clean - Clean build files"
@echo " distclean - Clean all generated files"
@echo " install - Install the built files"
@echo " menuconfig - Launch the menu-based configuration tool"
@echo "Flags:"
@echo " o=<dir>/ - Destination directory"
@echo " obj=<dir>/ - Build single target"
PHONY += menuconfig
menuconfig:
$(Q)$(MAKE) -C $(srctree)/scripts/kconfig menuconfig
PHONY += clang-format
clang-format:
$(Q)clang-format -i $(shell find . -name '*.c' -o -name '*.h' | grep -v './scripts/')
%/include/config/auto.conf %/include/generated/autoconf.h: $(KCONFIG_CONFIG)
$(Q)$(MAKE) -f scripts/kconfig/makefile syncconfig
.PHONY: $(PHONY)
|
