Adds a flag "use_instrumented_libraries" and corresponding target with 2 simple libs

third_party/instrumented_libraries/fix_rpaths

+#!/bin/bash
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be

[Nico, 2013/11/02 00:05:02]

(this one is ok as bash script for now for example, since it's short and easy to
rewrite in python when it starts growing)

+# found in the LICENSE file.
+
+# Changes all RPATHs in a given directory from XORIGIN to $ORIGIN 

[Nico, 2013/10/30 14:47:02]

Why is this needed? Can't you set them to the right thing in the first place?

[alextaran1, 2013/10/30 16:08:54]

No I can't. We need to export ..$ORIGIN.. to LDFLAGS in "download_build_install"
script, but this string contains a dollar sign "$". "configure" uses this
variable and writes to Makefile. make runs commands from Makefile. And each of
tries to use substitution rules. Different libraries use different structure of
build files and LDFLAGS pass through substitution rules differently. Moreover,
Makefile uses $$ to escape $, and bash-scripts use the other.
"Thanks" to autotools.

[Alexander Potapenko, 2013/10/31 12:18:16]

Please explain this in a comment in download_build_install and here (ok to just
write "see the comment in download_build_install").

[alextaran1, 2013/11/01 11:17:00]

Done.

+
+# Fixes rpath from XORIGIN to $ORIGIN in a single file $1.
+function fix_rpath {
+  chrpath -r $(chrpath $1 | cut -d " " -f 2 | sed s/XORIGIN/\$ORIGIN/g \
+    | sed s/RPATH=//g) $1 > /dev/null
+}
+
+for i in $(find $1 | grep "\.so$"); do
+  fix_rpath $i
+done
+
+# Mark that rpaths are fixed.
+# This file is used by GYP as 'output' to mark that RPATHs are alreaty fixed

[Nico, 2013/10/30 14:47:02]

typo alreaty

[alextaran1, 2013/10/30 16:08:54]

Done.

+# while making incremental build.

[Nico, 2013/10/30 14:47:02]

"for incremental builds"

[alextaran1, 2013/10/30 16:08:54]

Done.

+touch $1/rpaths.fixed.txt