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build: introduce PKG_BUILD_FLAGS

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coolsnowwolf 2024-05-29 10:35:11 +08:00
parent 4561705e1b
commit 0186d52076
2 changed files with 56 additions and 8 deletions
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15
config/Config-build.in
View File

@ -152,6 +152,21 @@ menu "Global build settings"
default n
help
Adds -g3 to the CFLAGS.
config USE_GC_SECTIONS
bool
prompt "Dead code and data elimination for all packages (EXPERIMENTAL)"
help
Places functions and data items into its own sections to use the linker's
garbage collection capabilites.
Packages can choose to opt-out via setting PKG_BUILD_FLAGS:=no-gc-sections
config USE_LTO
bool
prompt "Use the link-time optimizer for all packages (EXPERIMENTAL)"
help
Adds LTO flags to the CFLAGS and LDFLAGS.
Packages can choose to opt-out via setting PKG_BUILD_FLAGS:=no-lto
config IPV6
def_bool y

49
include/package.mk
View File

@ -11,8 +11,6 @@ include $(INCLUDE_DIR)/download.mk
PKG_BUILD_DIR ?= $(BUILD_DIR)/$(if $(BUILD_VARIANT),$(PKG_NAME)-$(BUILD_VARIANT)/)$(PKG_NAME)$(if $(PKG_VERSION),-$(PKG_VERSION))
PKG_INSTALL_DIR ?= $(PKG_BUILD_DIR)/ipkg-install
PKG_BUILD_PARALLEL ?=
PKG_USE_MIPS16 ?= 1
PKG_IREMAP ?= 1
PKG_SKIP_DOWNLOAD=$(USE_SOURCE_DIR)$(USE_GIT_TREE)$(USE_GIT_SRC_CHECKOUT)
MAKE_J:=$(if $(MAKE_JOBSERVER),$(MAKE_JOBSERVER) $(if $(filter 3.% 4.0 4.1,$(MAKE_VERSION)),-j))
@ -24,17 +22,52 @@ PKG_JOBS?=-j1
else
PKG_JOBS?=$(if $(PKG_BUILD_PARALLEL),$(MAKE_J),-j1)
endif
ifdef CONFIG_USE_MIPS16
ifeq ($(strip $(PKG_USE_MIPS16)),1)
TARGET_ASFLAGS_DEFAULT = $(filter-out -mips16 -minterlink-mips16,$(TARGET_CFLAGS))
TARGET_CFLAGS += -mips16 -minterlink-mips16
endif
PKG_BUILD_FLAGS?=
# TODO remove this when all packages moved to PKG_BUILD_FLAGS=no-mips16
PKG_USE_MIPS16?=1
ifneq ($(strip $(PKG_USE_MIPS16)),1)
PKG_BUILD_FLAGS+=no-mips16
endif
ifeq ($(strip $(PKG_IREMAP)),1)
__unknown_flags=$(filter-out no-iremap no-mips16 gc-sections no-gc-sections lto no-lto no-mold,$(PKG_BUILD_FLAGS))
ifneq ($(__unknown_flags),)
$(error unknown PKG_BUILD_FLAGS: $(__unknown_flags))
endif
# $1=flagname, $2=default (0/1)
define pkg_build_flag
$(if $(filter no-$(1),$(PKG_BUILD_FLAGS)),0,$(if $(filter $(1),$(PKG_BUILD_FLAGS)),1,$(2)))
endef
ifeq ($(call pkg_build_flag,iremap,1),1)
IREMAP_CFLAGS = $(call iremap,$(PKG_BUILD_DIR),$(notdir $(PKG_BUILD_DIR)))
TARGET_CFLAGS += $(IREMAP_CFLAGS)
endif
ifdef CONFIG_USE_MIPS16
ifeq ($(call pkg_build_flag,mips16,1),1)
TARGET_ASFLAGS_DEFAULT = $(filter-out -mips16 -minterlink-mips16,$(TARGET_CFLAGS))
TARGET_CFLAGS += -mips16 -minterlink-mips16
TARGET_CXXFLAGS += -mips16 -minterlink-mips16
endif
endif
ifeq ($(call pkg_build_flag,gc-sections,$(if $(CONFIG_USE_GC_SECTIONS),1,0)),1)
TARGET_CFLAGS+= -ffunction-sections -fdata-sections
TARGET_CXXFLAGS+= -ffunction-sections -fdata-sections
TARGET_LDFLAGS+= -Wl,--gc-sections
endif
ifeq ($(call pkg_build_flag,lto,$(if $(CONFIG_USE_LTO),1,0)),1)
TARGET_CFLAGS+= -flto=auto -fno-fat-lto-objects
TARGET_CXXFLAGS+= -flto=auto -fno-fat-lto-objects
TARGET_LDFLAGS+= -flto=auto -fuse-linker-plugin
endif
ifdef CONFIG_USE_MOLD
ifeq ($(call pkg_build_flag,mold,1),1)
TARGET_LINKER:=mold
endif
endif
include $(INCLUDE_DIR)/hardening.mk
include $(INCLUDE_DIR)/prereq.mk
include $(INCLUDE_DIR)/unpack.mk