Pascal --> C question

[Doug Gwyn]

In article <2351 at bsu-cs.UUCP> dhesi at bsu-cs.UUCP (Rahul Dhesi) writes:
-Another interesting optimization done by a VMS compiler, that competing
-vendors never thought of doing, is this.  If your C program contains
-     fflush(stdout);
-the VMS C compiler will optimize this into:
-     if (F$MODE == INTERACTIVE)       /* if interactive run */
-        fflush(stdout);
-     else
-        printf("\n");                 /* if batch run */

Is this true?  It's no wonder competing vendors didn't think of
doing it, because it's wrong.