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+#!/usr/bin/perl -w
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+# vi: set ts=4:
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+
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+# Libstrip - A utility to optimize libraries for specific executables
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+# Copyright (C) 2001 David A. Schleef <ds@schleef.org>
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+#
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+# This program is free software; you can redistribute it and/or modify
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+# it under the terms of version 2 of the GNU General Public License as
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+# published by the Free Software Foundation.
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+#
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+# This is a surprisingly simple script that gets a list of
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+# unresolved symbols in a list of executables specified on the
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+# command line, and then relinks the uClibc shared object file
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+# with only the those symbols and their dependencies. This
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+# results in a shared object that is optimized for the executables
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+# listed, and thus may not work with other executables.
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+#
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+# Example: optimizing uClibc for BusyBox
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+# Compile uClibc and BusyBox as normal. Then, in this
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+# directory, run:
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+# libstrip path/to/busybox
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+# After the script completes, there should be a new
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+# libuClibc-0.9.5.so in the current directory, which
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+# is optimized for busybox.
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+#
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+# How it works:
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+# The uClibc Makefiles create libuClibc.so by first creating
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+# the ar archive libc.a with all the object files, then links
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+# the final libuClibc.so by using 'ld --shared --whole-archive'.
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+# We take advantage of the linker command line option --undefined,
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+# which pulls in a symbol and all its dependencies, and so relink
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+# the library using --undefined for each symbol in place of
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+# --whole-archive. The linker script is used only to avoid
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+# having very long command lines.
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+
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+$topdir="../..";
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+
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+# This is the name of the default ldscript for shared libs. The
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+# file name will be different for other architectures.
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+$ldscript="/usr/lib/ldscripts/elf_i386.xs";
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+
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+my @syms;
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+my @allsyms;
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+my $s;
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+
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+while($exec = shift @ARGV){
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+ #print "$exec\n";
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+ @syms=`nm --dynamic $exec`;
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+ for $s (@syms){
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+ chomp $s;
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+ if($s =~ m/^.{8} [BUV] (.+)/){
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+ my $x = $1;
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+ if(!grep { m/^$x$/; } @allsyms){
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+ unshift @allsyms, $x;
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+ }
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+ }
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+ }
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+}
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+
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+open(LDSCRIPT, ">ldscript");
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+print LDSCRIPT "INCLUDE $ldscript\n";
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+for $s (@allsyms) {
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+ print LDSCRIPT "EXTERN($s)\n";
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+}
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+
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+
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+`gcc -s -nostdlib -Wl,-warn-common -shared \\
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+ -o libuClibc-0.9.5.so \\
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+ -Wl,-soname,libc.so.0 -Wl,--script=ldscript \\
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+ $topdir/libc/libc.a \\
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+ $topdir/libc/tmp/libgcc-need.a`
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+
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