build/cl.py

   1 # ***** BEGIN LICENSE BLOCK *****
   2 # Version: MPL 1.1/GPL 2.0/LGPL 2.1
   3 #
   4 # The contents of this file are subject to the Mozilla Public License Version
   5 # 1.1 (the "License"); you may not use this file except in compliance with
   6 # the License. You may obtain a copy of the License at
   7 # http://www.mozilla.org/MPL/
   8 #
   9 # Software distributed under the License is distributed on an "AS IS" basis,
  10 # WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  11 # for the specific language governing rights and limitations under the
  12 # License.
  13 #
  14 # The Original Code is cl.py: a python wrapper for cl to automatically generate
  15 # dependency information.
  16 #
  17 # The Initial Developer of the Original Code is
  18 #   Mozilla Foundation.
  19 # Portions created by the Initial Developer are Copyright (C) 2010
  20 # the Initial Developer. All Rights Reserved.
  21 #
  22 # Contributor(s):
  23 #   Kyle Huey <me@kylehuey.com>
  24 #
  25 # Alternatively, the contents of this file may be used under the terms of
  26 # either the GNU General Public License Version 2 or later (the "GPL"), or
  27 # the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28 # in which case the provisions of the GPL or the LGPL are applicable instead
  29 # of those above. If you wish to allow use of your version of this file only
  30 # under the terms of either the GPL or the LGPL, and not to allow others to
  31 # use your version of this file under the terms of the MPL, indicate your
  32 # decision by deleting the provisions above and replace them with the notice
  33 # and other provisions required by the GPL or the LGPL. If you do not delete
  34 # the provisions above, a recipient may use your version of this file under
  35 # the terms of any one of the MPL, the GPL or the LGPL.
  36 #
  37 # ***** END LICENSE BLOCK *****
  38
  39 import os, os.path
  40 import subprocess
  41 import sys
  42
  43 CL_INCLUDES_PREFIX = os.environ.get("CL_INCLUDES_PREFIX", "Note: including file:")
  44
  45 def InvokeClWithDependencyGeneration(cmdline):
  46     target = ""
  47     # Figure out what the target is
  48     for arg in cmdline:
  49         if arg.startswith("-Fo"):
  50             target = arg[3:]
  51             break
  52
  53     if target == None:
  54         print >>sys.stderr, "No target set" and sys.exit(1)
  55
  56     # The deps target lives here
  57     depstarget = os.path.basename(target) + ".pp"
  58
  59     cmdline += ['-showIncludes']
  60     cl = subprocess.Popen(cmdline, stdout=subprocess.PIPE)
  61
  62     deps = set()
  63     for line in cl.stdout:
  64         # cl -showIncludes prefixes every header with "Note: including file:"
  65         # and an indentation corresponding to the depth (which we don't need)
  66         if line.startswith(CL_INCLUDES_PREFIX):
  67             dep = line[len(CL_INCLUDES_PREFIX):].strip()
  68             # We can't handle pathes with spaces properly in mddepend.pl, but
  69             # we can assume that anything in a path with spaces is a system
  70             # header and throw it away.
  71             if dep.find(' ') == -1:
  72                 deps.add(dep)
  73         else:
  74             sys.stdout.write(line) # Make sure we preserve the relevant output
  75                                    # from cl
  76
  77     ret = cl.wait()
  78     if ret != 0 or target == "":
  79         sys.exit(ret)
  80
  81     depsdir = os.path.normpath(os.path.join(os.path.dirname(target), ".deps"))
  82     depstarget = os.path.join(depsdir, depstarget)
  83     if not os.path.isdir(depsdir):
  84         try:
  85             os.makedirs(depsdir)
  86         except OSError:
  87             pass # This suppresses the error we get when the dir exists, at the
  88                  # cost of masking failure to create the directory.  We'll just
  89                  # die on the next line though, so it's not that much of a loss.
  90
  91     f = open(depstarget, "w")
  92     for dep in sorted(deps):
  93         print >>f, "%s: %s" % (target, dep)
  94
  95 if __name__ == "__main__":
  96     InvokeClWithDependencyGeneration(sys.argv[1:])