[Patch #441691] preprocess() method for Borland C compiler.

    I have no way of testing this.

bcppcompiler.py

@@ -21,7 +21,7 @@ from distutils.errors import \
 from distutils.ccompiler import \
      CCompiler, gen_preprocess_options, gen_lib_options
 from distutils.file_util import write_file
-
+from distutils.dep_util import newer
 
 class BCPPCompiler(CCompiler) :
     """Concrete class that implements an interface to the Borland C/C++
@@ -373,3 +373,37 @@ class BCPPCompiler(CCompiler) :
         return obj_names
 
     # object_filenames ()
+
+    def preprocess (self,
+                    source,
+                    output_file=None,
+                    macros=None,
+                    include_dirs=None,
+                    extra_preargs=None,
+                    extra_postargs=None):
+
+        (_, macros, include_dirs) = \
+            self._fix_compile_args(None, macros, include_dirs)
+        pp_opts = gen_preprocess_options(macros, include_dirs)
+        pp_args = ['cpp32.exe'] + pp_opts
+        if output_file is not None:
+            pp_args.append('-o' + output_file)
+        if extra_preargs:
+            pp_args[:0] = extra_preargs
+        if extra_postargs:
+            pp_args.extend(extra_postargs)
+        pp_args.append(source)
+
+        # We need to preprocess: either we're being forced to, or the
+        # source file is newer than the target (or the target doesn't
+        # exist).
+        if self.force or output_file is None or newer(source, output_file):
+            if output_file:
+                self.mkpath(os.path.dirname(output_file))
+            try:
+                self.spawn(pp_args)
+            except DistutilsExecError, msg:
+                print msg
+                raise CompileError, msg
+
+    # preprocess()