Re: [PATCH] powerpc: Fix unitialized variable

[Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>]

On 10-12-2014 19:22, Joseph Myers wrote:
> On Wed, 10 Dec 2014, Adhemerval Zanella wrote:
>
>> The 'resolv/res_send.c' build with _STRING_ARCH_unaligned not defined
>> may utilize the local resplen uninitialized.  This patch sets it to 0.
> Do you have an actual path through the function that can result in it 
> being used uninitialized, and where a value of 0 is correct?

I do not, I used as default just to avoid the warning.

>
> My understanding, as described in 
> <https://sourceware.org/ml/libc-alpha/2014-11/msg00693.html>, was that 
> this is a false positive warning - the variable is never actually used 
> uninitialized, but determining that requires considering the values other 
> variables can have on the paths leading to resplen being used.  And since 
> we don't want to add initializations (to installed code as opposed to 
> testcases) that actually require code to be generated simply in order to 
> avoid warnings, that may indicate disabling -Wmaybe-uninitialized around 
> the code that generates the warning.
>
I understand the idea of avoid such warning, I will the compiler directives.