Preserve symlinks with the gyp "copies" command.

pylib/gyp/generator/scons.py

 #!/usr/bin/python
 
 
 import gyp
 import gyp.common
 # TODO(sgk):  create a separate "project module" for SCons?
 #import gyp.SCons as SCons
 import os.path
 import pprint
 import re
@@ skipping 376 matching lines @@
     if rule.get('process_outputs_as_sources'):
       fp.write('  input_files.Replace(%s_file, _outputs)\n' % name)
     fp.write('prerequisites.extend(_outputs)\n')
 
   SConsTypeWriter[spec.get('type')](fp, spec)
 
   copies = spec.get('copies', [])
   for copy in copies:
     destdir = copy['destination']
     files = copy['files']
-    fmt = '\n_outputs = env.Command(%s,\n    %s\n,    \'cp $SOURCE $TARGET\')\n'
+    opts = ''
+    # TODO(mmoss) Maybe make the "-d" configurable? How would a
+    # "no-dereference" copies option work in other generators?
+    fmt = '\n_outputs = env.Command(%s,\n    %s\n,    \'cp -d $SOURCE $TARGET\')\n'
     for f in copy['files']:
       dest = os.path.join(destdir, os.path.split(f)[1])
       fp.write(fmt % (repr(dest), repr(f)))
       fp.write('target_files.extend(_outputs)\n')
 
   fmt = "\ngyp_target = env.Alias('%s', target_files)\n"
   fp.write(fmt % target_name)
   dependencies = spec.get('scons_dependencies', [])
   if dependencies:
     WriteList(fp, dependencies, preamble='env.Requires(gyp_target, [\n    ',
@@ skipping 333 matching lines @@
       if target_dicts[t]['type'] == 'settings':
         continue
       bf, target = gyp.common.BuildFileAndTarget('', t)[:2]
       target_filename = TargetFilename(target, bf, options.suffix)
       tpath = gyp.common.RelativePath(target_filename, output_dir)
       sconscript_files[target] = tpath
 
     if sconscript_files:
       GenerateSConscriptWrapper(data[build_file], basename,
                                 output_filename, sconscript_files)