windows build fix

How did this ever work?

diff --git a/src/msvc_helper_main-win32.cc b/src/msvc_helper_main-win32.cc
index 3192821..ef91450 100644 (file)
--- a/src/msvc_helper_main-win32.cc
+++ b/src/msvc_helper_main-win32.cc
@@ -59,7 +59,8 @@ void WriteDepFileOrDie(const char* object_path, const CLParser& parse) {
     Fatal("writing %s", depfile_path.c_str());
   }
   const set<string>& headers = parse.includes_;
-  for (set<string>::iterator i = headers.begin(); i != headers.end(); ++i) {
+  for (set<string>::const_iterator i = headers.begin();
+       i != headers.end(); ++i) {
     if (fprintf(depfile, "%s\n", EscapeForDepfile(*i).c_str()) < 0) {
       unlink(object_path);
       fclose(depfile);