optimization/10423: -fvolatile switch not working in gcc 3.2-3 when using -O2

[Zack Weinberg]

The following reply was made to PR optimization/10423; it has been noted by GNATS.

From: Zack Weinberg <zack@codesourcery.com>
To: dberger@motorola.com
Cc: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org
Subject: Re: optimization/10423: -fvolatile switch not working in gcc 3.2-3
 when using -O2
Date: Wed, 16 Apr 2003 11:03:20 -0700

 dberger@motorola.com writes:
 
 > Compile with following using "gcc -O2 -fvolatile -S":
 >
 > void test(void)
 > {
 >   *(char *)0x100 = 1;
 >   *(char *)0x100 = 1;
 >   *(char *)0x100 = 1;
 >   *(char *)0x100 = 1;
 > }
 
 Allow me to refer you to the release notes for gcc 3.4 (that will be):
 
   GCC no longer accepts the options -fvolatile, -fvolatile-global and
   -fvolatile-static. It is unlikely that they worked correctly in any
   3.x release.
 
 Note in particular the last sentence.  You've just confirmed that it
 doesn't work.
 
 (to the list:) How about we remove these options from 3.2.3 and 3.3 as
 well?  It does not help anyone for them to be present but nonfunctional.
 
 zw