jcf-write.c (write_classfile): Remove target class file...

2002-11-22  Ranjit Mathew <rmathew@hotmail.com>
	    Andrew Haley <aph@redhat.com>

	* gcc/java/jcf-write.c (write_classfile): Remove target
	class file, if it exists, before renaming the temporary
	class file to it.

Co-Authored-By: Andrew Haley <aph@redhat.com>

From-SVN: r59386

gcc/java/ChangeLog

+2002-11-22  Ranjit Mathew <rmathew@hotmail.com>
+	    Andrew Haley <aph@redhat.com>
+
+	* gcc/java/jcf-write.c (write_classfile): Remove target
+	class file, if it exists, before renaming the temporary
+	class file to it.
+
 2002-11-19  Jason Thorpe  <thorpej@wasabisystems.com>
 
 	* jvspec.c (lang_specific_spec_functions): New.

gcc/java/jcf-write.c

@@ -3422,6 +3422,15 @@ write_classfile (clas)
       write_chunks (stream, chunks);
       if (fclose (stream))
 	fatal_io_error ("error closing %s", temporary_file_name);
+
+      /* If a file named by the string pointed to by `new' exists
+         prior to the call to the `rename' function, the bahaviour
+         is implementation-defined.  ISO 9899-1990 7.9.4.2.
+
+         For example, on Win32 with MSVCRT, it is an error. */
+
+      unlink (class_file_name);
+
       if (rename (temporary_file_name, class_file_name) == -1)
 	{
 	  remove (temporary_file_name);