gcc 3.1 hangs forever on Red Hat 7.2 system

[Andy Tai]

Hi, I think this is a possible bug in gcc 3.1 but I
send to this list to be sure first.  On a Red Hat
GNU/Linux 7.2 system (x86), with gcc 3.1, when
compiling the following source file with optimization
turned on (-O1 or above), gcc 3.1 hangs forever. With
optimization off (or use -O0), gcc 3.1 finishes
compiling with no problems.

test.c:
-----
void f(void)
{
    char *c;
    do
    {
        if (c)
            break;
    } while (1);
    if (!c)
        while (1)
            f();
}
-----
The following command will hang forever (same with
-O2, -O3, etc.):

% gcc -O1 -c test.c

gcc 2.95.3 compiles the file without problems.
 
System information:
% gcc -v
Reading specs from
/share/software/gcc-3.1/installed/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs
Configured with: ../gcc-3.1/configure
--prefix=/share/software/gcc-3.1/installed
--enable-threads --enable-languages=c,c++
Thread model: posix
gcc version 3.1


Thanks for any work arounds.

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