Build and install LLVM gold plugin on Linux.

tools/clang/plugins/ChromeClassTester.cpp

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A general interface for filtering and only acting on classes in Chromium C++
 // code.
 
 #include "ChromeClassTester.h"
 
 #include <sys/param.h>
@@ skipping 131 matching lines @@
 
   banned_namespaces_.push_back("blink");
   banned_namespaces_.push_back("WTF");
 
   banned_directories_.push_back("/third_party/");
   banned_directories_.push_back("/native_client/");
   banned_directories_.push_back("/breakpad/");
   banned_directories_.push_back("/courgette/");
   banned_directories_.push_back("/pdf/");
   banned_directories_.push_back("/ppapi/");
-  banned_directories_.push_back("/usr/");
+  banned_directories_.push_back("/usr/include/");
+  banned_directories_.push_back("/usr/lib/");
+  banned_directories_.push_back("/usr/local/include/");
+  banned_directories_.push_back("/usr/local/lib/");
   banned_directories_.push_back("/testing/");
   banned_directories_.push_back("/v8/");
   banned_directories_.push_back("/dart/");
   banned_directories_.push_back("/sdch/");
   banned_directories_.push_back("/icu4c/");
   banned_directories_.push_back("/frameworks/");
 
   // Don't check autogenerated headers.
   // Make puts them below $(builddir_name)/.../gen and geni.
   // Ninja puts them below OUTPUT_DIR/.../gen
@@ skipping 93 matching lines @@
   }
 
   // We need to munge the paths so that they are relative to the repository
   // srcroot. We first resolve the symlinktastic relative path and then
   // remove our known srcroot from it if needed.
   char resolvedPath[MAXPATHLEN];
   if (realpath(filename.c_str(), resolvedPath)) {
     filename = resolvedPath;
   }
 
-  // On linux, chrome is often checked out to /usr/local/google. Due to the
-  // "usr" rule in banned_directories_, all diagnostics would be suppressed
-  // in that case. As a workaround, strip that prefix.
-  filename = lstrip(filename, "/usr/local/google");
-
   for (size_t i = 0; i < banned_directories_.size(); ++i) {
     // If any of the banned directories occur as a component in filename,
     // this file is rejected.
     const std::string& banned_dir = banned_directories_[i];
     assert(banned_dir.front() == '/' && "Banned dir must start with '/'");
     assert(banned_dir.back() == '/' && "Banned dir must end with '/'");
 
     if (filename.find(banned_dir) != std::string::npos)
       return true;
   }
@@ skipping 12 matching lines @@
   PresumedLoc ploc = source_manager.getPresumedLoc(spelling_location);
   if (ploc.isInvalid()) {
     // If we're in an invalid location, we're looking at things that aren't
     // actually stated in the source.
     return false;
   }
 
   *filename = ploc.getFilename();
   return true;
 }