Re: new option -Wno-maybe-uninitialized

[Jeff Law <law@redhat.com>]

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On 04/21/11 11:43, Xinliang David Li wrote:

> 
> There are three different kind of uninit warnings:
> 
> 1) definitely uninitialized, and the use the variable dominates the
> exit -- this is the must be used uninitialized case
> 2) definitely uninitialized, but the use may not be executed at runtime;
> 3) Only initialized in some paths from entry to the use (the use may
> or may not be executed).
> 
> Currently 2) and 3) uses the same warning message, which may be misleading.
> 
> The proposed new option only controls  3).
It's certainly possible to have an uninitialized use dominating an exit
which can never be executed (think infinite loop which can't be detected
at compile time.

I bring these issues up primarily to get us thinking about how better to
describe the scenarios where we warn in our documentation.  I don't want
to hold up real improvements.


> 
>> No, the patch does not change the default behavior of -Wuninitialized
>> wihch will turn on -Wmaybe-uninitialized as well. The only useful
>> scenarios for the new option are:
OK.  I must have misread something.


Given the fact that your patch isn't changing the -Wuninitialized
behaviour, then let's go ahead with your patch.

Jeff
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