Implement a tool called link_limiter to impose a global restriction on how many

tools/win/link_limiter/build_link_limiter.py

+#!/usr/bin/env python
+# 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.
+
+import glob
+import os
+import shutil
+import subprocess
+import sys
+import tempfile
+
+BUILD_DIR = 'build'
+
+
+def run_with_vsvars(cmd, tmpdir=None):
+  fd, filename = tempfile.mkstemp('.bat', text=True)
+  with os.fdopen(fd, 'w') as f:
+    print >> f, '@echo off'
+    print >> f, r'call "%VS100COMNTOOLS%\vsvars32.bat"'
+    if tmpdir:
+      print >> f, r'cd %s' % tmpdir
+    print >> f, cmd
+  try:
+    p = subprocess.Popen([filename], shell=True, stdout=subprocess.PIPE,
+        universal_newlines=True)
+    out, _ = p.communicate()
+    return p.returncode, out
+  finally:
+    os.unlink(filename)
+
+
+def get_vc_dir():
+  _, out = run_with_vsvars('echo VCINSTALLDIR=%VCINSTALLDIR%')
+  for line in out.splitlines():  # pylint: disable-msg=E1103
+    if line.startswith('VCINSTALLDIR='):
+      return line[len('VCINSTALLDIR='):]
+  return None
+
+
+def build(infile):
+  if not os.path.exists(BUILD_DIR):
+    os.makedirs(BUILD_DIR)
+  outfile = 'limiter.exe'
+  outpath = os.path.join(BUILD_DIR, outfile)
+  cpptime = os.path.getmtime(infile)
+  if not os.path.exists(outpath) or cpptime > os.path.getmtime(outpath):
+    print 'Building %s...' % outfile
+    rc, out = run_with_vsvars(
+        'cl /nologo /Ox /Zi /W4 /WX /D_UNICODE /DUNICODE'
+        ' /D_CRT_SECURE_NO_WARNINGS /EHsc %s /link /out:%s'
+        % (os.path.join('..', infile), outfile), BUILD_DIR)
+    if rc:
+      print out
+      print 'Failed to build %s' % outfile
+      sys.exit(1)
+  else:
+    print '%s already built' % outfile
+  return outpath
+
+
+def main():
+  # Switch to our own dir.
+  os.chdir(os.path.dirname(os.path.abspath(__file__)))
+
+  if sys.argv[-1] == 'clean':
+    if os.path.exists(BUILD_DIR):
+      shutil.rmtree(BUILD_DIR)
+    for exe in glob.glob('*.exe'):
+      os.unlink(exe)
+    return 0
+
+  vcdir = os.environ.get('VCINSTALLDIR')
+  if not vcdir:
+    vcdir = get_vc_dir()
+    if not vcdir:
+      print 'Could not get VCINSTALLDIR. Run vsvars32.bat?'
+      return 1
+    os.environ['PATH'] += (';' + os.path.join(vcdir, 'bin') +
+                           ';' + os.path.join(vcdir, r'..\Common7\IDE'))
+
+  # Verify that we can find link.exe.
+  link = os.path.join(vcdir, 'bin', 'link.exe')
+  if not os.path.exists(link):
+    print 'link.exe not found at %s' % link
+    return 1
+
+  exe_name = build('limiter.cc')
+  for shim_exe in ('lib.exe', 'link.exe'):
+    newpath = '%s__LIMITER.exe' % shim_exe
+    shutil.copyfile(exe_name, newpath)
+    print '%s shim built. Use with msbuild like: "/p:LinkToolExe=%s"' \
+        % (shim_exe, os.path.abspath(newpath))
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())