base-files: relink uclibc and libgcc libraries to remove leftovers of the statically...

saves a few kb and gets rid of unused not exported functions as well
should also improve the reliability of mklibs

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25800 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/base-files/Makefile b/package/base-files/Makefile
index 4abbdf7..27916f3 100644 (file)
--- a/package/base-files/Makefile
+++ b/package/base-files/Makefile
@@ -327,8 +327,56 @@ endef
 define Build/Compile/Default
 endef
 
+LIBGCC_A=$(wildcard $(TOOLCHAIN_DIR)/lib/gcc/*/*/libgcc_pic.a)
+LIBGCC_MAP=$(wildcard $(TOOLCHAIN_DIR)/lib/gcc/*/*/libgcc.map)
+
+ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
+  define Build/Compile/uClibc
+       $(SCRIPT_DIR)/relink-lib.sh \
+               "$(TARGET_CROSS)" \
+               "$(wildcard $(TOOLCHAIN_DIR)/lib/libc_so.a)" \
+               "$(wildcard $(TOOLCHAIN_DIR)/lib/libc_so.a)" \
+               "$(patsubst $(TOOLCHAIN_DIR)/lib/%,$(PKG_BUILD_DIR)/%,$(wildcard $(TOOLCHAIN_DIR)/lib/libuClibc-*.so))" \
+               -Wl,-init,__uClibc_init -Wl,-soname=libc.so.0 \
+               $(PKG_BUILD_DIR)/libgcc_s.so.*
+       $(SCRIPT_DIR)/relink-lib.sh \
+               "$(TARGET_CROSS)" \
+               "$(wildcard $(TOOLCHAIN_DIR)/lib/libcrypt-*.so)" \
+               "$(wildcard $(TOOLCHAIN_DIR)/lib/libcrypt_pic.a)" \
+               "$(patsubst $(TOOLCHAIN_DIR)/lib/%,$(PKG_BUILD_DIR)/%,$(wildcard $(TOOLCHAIN_DIR)/lib/libcrypt-*.so))" \
+               $(PKG_BUILD_DIR)/libgcc_s.so.* \
+               -Wl,-soname=libcrypt.so.0
+       $(SCRIPT_DIR)/relink-lib.sh \
+               "$(TARGET_CROSS)" \
+               "$(wildcard $(TOOLCHAIN_DIR)/lib/libm-*.so)" \
+               "$(wildcard $(TOOLCHAIN_DIR)/lib/libm_pic.a)" \
+               "$(patsubst $(TOOLCHAIN_DIR)/lib/%,$(PKG_BUILD_DIR)/%,$(wildcard $(TOOLCHAIN_DIR)/lib/libm-*.so))" \
+               $(PKG_BUILD_DIR)/libgcc_s.so.* \
+               -Wl,-soname=libm.so.0
+       $(SCRIPT_DIR)/relink-lib.sh \
+               "$(TARGET_CROSS)" \
+               "$(wildcard $(TOOLCHAIN_DIR)/lib/libpthread-*.so)" \
+               "$(wildcard $(TOOLCHAIN_DIR)/lib/libpthread_so.a)" \
+               "$(patsubst $(TOOLCHAIN_DIR)/lib/%,$(PKG_BUILD_DIR)/%,$(wildcard $(TOOLCHAIN_DIR)/lib/libpthread-*.so))" \
+               -Wl,-z,nodelete,-z,initfirst,-init=__pthread_initialize_minimal_internal \
+               $(PKG_BUILD_DIR)/libgcc_s.so.* \
+               -Wl,-soname=libpthread.so.0
+  endef
+
+  define Build/Compile/libgcc
+       $(SCRIPT_DIR)/relink-lib.sh \
+               "$(TARGET_CROSS)" \
+               "$(wildcard $(TOOLCHAIN_DIR)/lib/libgcc_s.so.*)" \
+               "$(LIBGCC_A)" \
+               "$(patsubst $(TOOLCHAIN_DIR)/lib/%,$(PKG_BUILD_DIR)/%,$(wildcard $(TOOLCHAIN_DIR)/lib/libgcc_s.so.*))" \
+               -Wl,--version-script=$(LIBGCC_MAP) -Wl,-soname=libgcc_s.so.1
+  endef
+endif
+
 define Build/Compile
        $(call Build/Compile/Default)
+       $(call Build/Compile/libgcc)
+       $(call Build/Compile/$(LIBC))
 endef
 
 define Package/base-files/install
@@ -398,7 +446,7 @@ ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
 
   define Package/libgcc/install
        $(INSTALL_DIR) $(1)/lib
-       $(CP) $(TOOLCHAIN_DIR)/lib/libgcc_s.so.* $(1)/lib/
+       $(CP) $(PKG_BUILD_DIR)/libgcc_s.so.* $(1)/lib/
   endef
 
   define Package/libssp/install
@@ -450,6 +498,12 @@ ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
                        $(TOOLCHAIN_DIR)/lib/$$$$file-$(LIBC_SO_VERSION).so \
                        $(1)/lib/; \
        done
+
+       $(CP) \
+               $(PKG_BUILD_DIR)/libuClibc-* \
+               $(PKG_BUILD_DIR)/libm-* \
+               $(PKG_BUILD_DIR)/libcrypt-* \
+               $(1)/lib/
   endef
 
   define Package/libc/install
@@ -459,9 +513,9 @@ ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
   define Package/libc/install_lib
        $(CP) $(filter-out %/libdl_pic.a %/libpthread_pic.a %/libresolv_pic.a,$(wildcard $(TOOLCHAIN_DIR)/lib/lib*.a)) $(1)/lib/
        $(if $(wildcard $(TOOLCHAIN_DIR)/lib/libc_so.a),$(CP) $(TOOLCHAIN_DIR)/lib/libc_so.a $(1)/lib/libc_pic.a)
-       $(if $(wildcard $(TOOLCHAIN_DIR)/lib/gcc/*/*/libgcc.map), \
-               $(CP) $(TOOLCHAIN_DIR)/lib/gcc/*/*/libgcc_pic.a $(1)/lib/libgcc_s_pic.a; \
-               $(CP) $(TOOLCHAIN_DIR)/lib/gcc/*/*/libgcc.map $(1)/lib/libgcc_s_pic.map \
+       $(if $(LIBGCC_MAP), \
+               $(CP) $(LIBGCC_A) $(1)/lib/libgcc_s_pic.a; \
+               $(CP) $(LIBGCC_MAP) $(1)/lib/libgcc_s_pic.map \
        )
   endef
 
@@ -469,7 +523,7 @@ ifeq ($(CONFIG_EXTERNAL_TOOLCHAIN),)
        $(INSTALL_DIR) $(1)/lib
        $(CP) \
                $(TOOLCHAIN_DIR)/lib/libpthread.so.* \
-               $(TOOLCHAIN_DIR)/lib/libpthread-$(LIBC_SO_VERSION).so \
+               $(PKG_BUILD_DIR)/libpthread-$(LIBC_SO_VERSION).so \
                $(1)/lib/
   endef
 

diff --git a/scripts/relink-lib.sh b/scripts/relink-lib.sh
new file mode 100755 (executable)
index 0000000..5367b70
--- /dev/null
+++ b/scripts/relink-lib.sh
@@ -0,0 +1,14 @@
+#!/bin/sh
+[ $# -lt 4 -o -z "$1" -o -z "$2" -o -z "$3" -o -z "$4" ] && {
+       echo "Usage: $0 <cross> <reference> <pic .a> <destination>"
+       exit 1
+}
+
+cross="$1"; shift
+ref="$1"; shift
+pic="$1"; shift
+dest="$1"; shift
+
+SYMBOLS="$(${cross}nm "$ref" | grep -E '........ [TW] ' | awk '$3 {printf "-u%s ", $3}')"
+set -x
+${cross}gcc -nostdlib -nostartfiles -shared -Wl,--gc-sections -o "$dest" $SYMBOLS "$pic" "$@"