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busybox: compile with LTO enabled

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In the default configuration on MIPS, it reduces the .ipk size
from 214k to 207k

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2018-07-11 18:30:03 +02:00
parent 4e56af5ab4
commit 8c11133c9d
2 changed files with 42 additions and 5 deletions
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20
package/utils/busybox/Makefile
View file

@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=busybox
PKG_VERSION:=1.28.4
PKG_RELEASE:=2
PKG_RELEASE:=3
PKG_FLAGS:=essential
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
@ -20,7 +20,6 @@ PKG_HASH:=e3c14a3699dc7e82fed397392957afc78e37bdf25398ac38ead6e84621b2ae6a
PKG_BUILD_DEPENDS:=BUSYBOX_USE_LIBRPC:librpc BUSYBOX_CONFIG_PAM:libpam
PKG_BUILD_PARALLEL:=1
PKG_CHECK_FORMAT_SECURITY:=0
PKG_INSTALL:=1
#Busybox use it's own PIE config flag and LDFLAGS are used with ld, not gcc.
PKG_ASLR_PIE:=0
@ -75,7 +74,10 @@ endef
export KCONFIG_NOTIMESTAMP=1
ifndef CONFIG_USE_MUSL
LDLIBS:=m crypt
endif
LDLIBS += $(call BUSYBOX_IF_ENABLED,PAM,pam pam_misc pthread)
ifdef CONFIG_BUSYBOX_USE_LIBRPC
LDLIBS += rpc
@ -84,24 +86,32 @@ ifeq ($(CONFIG_USE_GLIBC),y)
LDLIBS += $(call BUSYBOX_IF_ENABLED,NSLOOKUP_OPENWRT,resolv)
endif
TARGET_CFLAGS += -flto
TARGET_LDFLAGS += -flto=jobserver -fuse-linker-plugin
MAKE_VARS :=
MAKE_FLAGS += \
EXTRA_CFLAGS="$(TARGET_CFLAGS) $(TARGET_CPPFLAGS)" \
EXTRA_LDFLAGS="$(TARGET_LDFLAGS)" \
LDLIBS="$(LDLIBS)" \
LD="$(TARGET_CC)" \
SKIP_STRIP=y
ifneq ($(findstring c,$(OPENWRT_VERBOSE)),)
MAKE_FLAGS += V=1
endif
MAKE_INSTALL_FLAGS += CONFIG_PREFIX="$(PKG_INSTALL_DIR)"
define Build/Configure
grep 'CONFIG_BUSYBOX_$(BUSYBOX_SYM)' $(TOPDIR)/.config | sed -e "s,\\(# \)\\?CONFIG_BUSYBOX_$(BUSYBOX_SYM)_\\(.*\\),\\1CONFIG_\\2,g" > $(PKG_BUILD_DIR)/.config
yes 'n' | $(MAKE) -C $(PKG_BUILD_DIR) $(MAKE_FLAGS) oldconfig
endef
define Build/Compile
$(call Build/Compile/Default, \
CONFIG_PREFIX="$(PKG_INSTALL_DIR)" \
all install \
)
endef
define Package/busybox/install
$(INSTALL_DIR) $(1)/etc/init.d
$(CP) $(PKG_INSTALL_DIR)/* $(1)/

27
package/utils/busybox/patches/120-lto-jobserver.patch Normal file
View file

@ -0,0 +1,27 @@
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -130,7 +130,7 @@ make-cmd = $(subst \#,\\\#,$(subst $$,$$
#
if_changed = $(if $(strip $(filter-out $(PHONY),$?) \
$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
- @set -e; \
+ +@set -e; \
$(echo-cmd) $(cmd_$(1)); \
echo 'cmd_$@ := $(make-cmd)' > $(@D)/.$(@F).cmd)
@@ -139,7 +139,7 @@ if_changed = $(if $(strip $(filter-out $
if_changed_dep = $(if $(strip $(filter-out $(PHONY),$?) \
$(filter-out FORCE $(wildcard $^),$^) \
$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
- @set -e; \
+ +@set -e; \
$(echo-cmd) $(cmd_$(1)); \
scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(@D)/.$(@F).tmp; \
rm -f $(depfile); \
@@ -150,5 +150,5 @@ if_changed_dep = $(if $(strip $(filter-o
# and if so will execute $(rule_foo)
if_changed_rule = $(if $(strip $(filter-out $(PHONY),$?) \
$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\
- @set -e; \
+ +@set -e; \
$(rule_$(1)))