re PR fortran/39309 (.mod file versioning causes error instead of overwritting the file)

2009-02-27  Tobias Burnus  <burnus@net-b.de>

        PR fortran/39309
        * module.c (read_md5_from_module_file): Include mod version
        in had-changed test.

From-SVN: r144461

gcc/fortran/ChangeLog

+2009-02-27  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/39309
+	* module.c (read_md5_from_module_file): Include mod version
+	in had-changed test.
+
 2009-02-26  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/39295

gcc/fortran/module.c

@@ -4739,8 +4739,18 @@ read_md5_from_module_file (const char * filename, unsigned char md5[16])
     return -1;
 
   /* Read two lines.  */
-  if (fgets (buf, sizeof (buf) - 1, file) == NULL
-      || fgets (buf, sizeof (buf) - 1, file) == NULL)
+  if (fgets (buf, sizeof (buf) - 1, file) == NULL)
+    {
+      fclose (file);
+      return -1;
+    }
+
+  /* The file also needs to be overwritten if the version number changed.  */
+  n = strlen ("GFORTRAN module version " MOD_VERSION " created");
+  if (strncmp (buf, "GFORTRAN module version " MOD_VERSION " created", n) != 0)
+    return -1;
+ 
+  if (fgets (buf, sizeof (buf) - 1, file) == NULL)
     {
       fclose (file);
       return -1;