Hi all,
Please find below a proof-of-concept of the mklibs.py reduction integration in
OpenWrt. I have not been able to strip the uClibc loader more than 4KB out of
28KB (original size) but it might significantly
better results with more softare installed in the rootfs.
---
Index: Config.in
===================================================================
--- Config.in (revision 16963)
+++ Config.in (working copy)
@@ -142,6 +142,13 @@
This will install all compiled package binaries into
build_dir/target-*/debug-*/,
useful for cross-debugging via gdb/gdbserver
+config USE_MKLIBS
+ bool "Run mklibs.py on the final root filesystem to strip down even
more libraries"
+ default n
+ help
+ This will run mklibs.py on the root filesystem and recompile
the libraries to remove
+ unused symbols.
+
comment "Kernel build options"
config KERNEL_KALLSYMS
Index: tools/mklibs/Makefile
===================================================================
--- tools/mklibs/Makefile (revision 0)
+++ tools/mklibs/Makefile (revision 0)
@@ -0,0 +1,30 @@
+#
+# Copyright (C) 2009 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=mklibs
+PKG_VERSION:=0.1.26
+
+PKG_SOURCE:=$(PKG_NAME)_$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=http://ftp.de.debian.org/debian/pool/main/m/mklibs/
+PKG_MD5SUM:=708f284975f1b567b817d27f7677a95f
+
+include $(INCLUDE_DIR)/host-build.mk
+
+define Host/Install
+ $(INSTALL_BIN) \
+ $(HOST_BUILD_DIR)/src/mklibs.py \
+ $(HOST_BUILD_DIR)/src/mklibs-copy.py \
+ $(HOST_BUILD_DIR)/src/mklibs-readelf/mklibs-readelf \
+ $(STAGING_DIR_HOST)/bin/
+endef
+
+define Host/Clean
+ rm -f $(STAGING_DIR_HOST)/bin/mklibs*
+endef
+
+$(eval $(call HostBuild))
Index: tools/Makefile
===================================================================
--- tools/Makefile (revision 16963)
+++ tools/Makefile (working copy)
@@ -11,7 +11,7 @@
# subdirectories to descend into
tools-y :=
tools-$(CONFIG_GCC_VERSION_4_3)$(CONFIG_GCC_VERSION_4_4) += gmp mpfr
-tools-y += m4 autoconf automake bison pkg-config sed
+tools-y += m4 autoconf automake bison pkg-config sed mklibs
tools-y += sstrip ipkg-utils genext2fs squashfs squashfs4 mtd-utils lzma-old
mkimage
tools-y += firmware-utils patch-cmdline quilt yaffs2
Index: include/image.mk
===================================================================
--- include/image.mk (revision 16963)
+++ include/image.mk (working copy)
@@ -125,6 +125,20 @@
$(call Image/mkfs/prepare/default)
endef
+ifeq ($(CONFIG_USE_MKLIBS),y)
+ define Image/mklibs
+ # Generate the list of programs
+ - rm $(KDIR)/mklibs-progs
+ find $(TARGET_DIR) -type f -perm +100 -exec \
+ file -r -N -F '' {} + | \
+ awk ' /executable.*dynamically/ { print $$$$1 }' >
$(KDIR)/mklibs-progs
+ ifeq ($(CONFIG_USE_UCLIBC),y)
+ $(STAGING_DIR_HOST)/bin/mklibs.py -D -L $(STAGING_DIR)/lib -L
$(TOOLCHAIN_DIR)/lib --ldlib=$(TOOLCHAIN_DIR)/lib/ld-uClibc.so.0 \
+ --target=$(GNU_TARGET_NAME) -d $(TARGET_DIR) `cat
$(KDIR)/mklibs-progs`
+ endif
+ endef
+endif
+
define BuildImage
download:
prepare:
@@ -137,6 +151,7 @@
ifneq ($(IB),1)
install: compile install-targets FORCE
+ $(call Image/mklibs)
$(call Image/Prepare)
$(call Image/mkfs/prepare)
$(call Image/BuildKernel)
--
Best regards, Florian Fainelli
Email: flor...@openwrt.org
Web: http://openwrt.org
IRC: [florian] on irc.freenode.net
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