[Bug c/34351] New: Please get us the "volatile register" warning back

[j at uriah dot heep dot sax dot de]

Microcontroller programmers tend to fall into the trap of trying to
bind a variable to a CPU register, and declare it "volatile" so they
could e.g. use it to communicate between the main context and an ISR.

Previous GCC versions issued a warning:

volatile register variables don't work as you might wish

This warning has been removed without making volatile register variables
work the way an innocent programmer would assume.

Please re-enable that warning at least for -Wall and/or -Wextra.


-- 
           Summary: Please get us the "volatile register" warning back
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: j at uriah dot heep dot sax dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34351