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

Zack Weinberg zack@codesourcery.com
Wed Apr 16 18:03:00 GMT 2003


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



More information about the Gcc-bugs mailing list