Subject: Re: Warnings in nfsv3 code--buggy gcc?
To: Allen Briggs <firstname.lastname@example.org>
From: J.T. Conklin <email@example.com>
Date: 03/29/1996 07:05:40
> (the warning in nfs/nfs_serv.c was for a variable of the same name)
> As far as I can tell by looking at the code, this is a completely bogus
> warning. Has anyone else run across this? Does anyone know enough
> about gcc to know how this might be happening? Could it be related to
> the fact that cur_usec is a u_quad_t?
Gcc's flow analysis for -Wuninitialized is unable to detect some cases
where a variable is conditionally initialized and then used in similar
conditional code later in the function. This results in "false
-Wuninitialized is a good warning, but since it's not 100%, I don't
recommend combining it with -Werror. Some people get around this by
always initializing the variable to some dummy value. I think this
is terrible practice, as it defeats the ability of run-time tools
that track variable usage to detect uninitialized variable usage.