Fix SCons-based webkit build on Windows (broken by the Linux

command-line changes) by using portable SCons idioms:
* Side-step command-line differences by using a Python function as a
  build action to generate a .h file by surrounding the contents of
  the yacc-generated .hpp file with a #ifndef-#define-#endif guard.
* Use the pre-defined Delete() ActionFactory to let SCons delete the
  .hpp file directly, instead of calling "rm" to do it.
TBR: evanm

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@1523 0039d316-1c4b-4281-b951-d872f2087c98

webkit/build/port/SConscript

@@ -566,20 +566,31 @@ env.Command(['$DERIVED_DIR/UserAgentStyleSheets.h',
              '$DERIVED_DIR/quirks.css'],
             '$PERL ${SOURCES[0].posix} ${TARGETS.posix} ${SOURCES[1:].posix}')
 
+def create_h_wrapper(target, source, env):
+  """
+  Create a *.h file by surrounding the contents of a
+  yacc-generated *.hpp with a #ifndef-#define-#endif guard.
+  """
+  t = str(target[1])
+  fp = open(t, 'w')
+  define = os.path.splitext(os.path.split(t)[1])[0]
+  fp.write('#ifndef %s_h\n' % define)
+  fp.write('#define %s_h\n' % define)
+  fp.write(open(t + 'pp', 'r').read())
+  fp.write('#endif %s_h\n' % define)
+
+# TODO(sgk):  make this a real pseudo-Builder
 def BuildYacc(env, dir, name, file):
   env.Command(['$DERIVED_DIR/%s.cpp' % file,
                '$DERIVED_DIR/%s.h'   % file],
               ['$WEBKIT_PORT_DIR/%s/%s.y' % (dir, file)],
-              ('$YACC -d -p %syy ${SOURCES[0].posix} ' % name +
-                 '-o ${TARGET.posix} && ' +
-               '(echo \#ifndef %s_h;' % file +
-               ' echo \#define %s_h;' % file +
-               ' cat $DERIVED_DIR/%s.hpp;' % file +
-               ' echo \#endif) >> $DERIVED_DIR/%s.h && ' % file +
-               'rm $DERIVED_DIR/%s.hpp' % file))
-
-BuildYacc(env, 'xml', 'xpath', 'XPathGrammar')
-BuildYacc(env, 'css', 'css',   'CSSGrammar')
+              ['$YACC -d -p %s ${SOURCES[0].posix} ' % name +
+                 '-o ${TARGET.posix}',
+               Action(create_h_wrapper),
+               Delete('${TARGETS[1]}pp')])
+
+BuildYacc(env, 'xml', 'xpathyy', 'XPathGrammar')
+BuildYacc(env, 'css', 'cssyy',   'CSSGrammar')
 
 # TODO(bradnelson): need to add in error checking