buildworld fails with warning in usr.bin/diff/diffreg.c

[Dimitry Andric]

> On 24 Apr 2017, at 20:26, Brooks Davis <brooks at freebsd.org> wrote:
> 
> On Mon, Apr 24, 2017 at 10:04:15AM -0700, Hamza Sheikh wrote:
>> The error is:
>> 
>> --- all_subdir_usr.bin ---
>> cc1: warnings being treated as errors
>> /home/vagrant/src/usr.bin/diff/diffreg.c: In function 'change':
>> /home/vagrant/src/usr.bin/diff/diffreg.c:1085: warning: 'i' may be
>> used uninitialized in this function
> 
> If I'm reading the code correctly, this is caused by this code at line
> 1217 and the analyzer being insufficiently smart (all prior uses include
> initialization in for() loops):
> 
>        if (diff_format != D_GFORMAT)
>                i = fetch(ixnew, c, d, f2, diff_format == D_NORMAL ? '>' : '\0', 0, *pflags);
>        if (i != 0 && diff_format == D_EDIT) {
> 
> Adding "i = 0;" above this fixes the warning for me and appears to
> preserve the intent.  This variable should be named something other than
> i to avoid confusion.

See also https://reviews.freebsd.org/D10462 . Sorry for slacking off on that. :)

-Dimitry

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