Re: [PATCH] warn on mem calls modifying objects of non-trivial types (PR 80560)

["Richard Earnshaw (lists)" <Richard.Earnshaw@arm.com>]

On 29/06/17 17:15, Jan Hubicka wrote:
> Hello,
>> diff --git a/gcc/hash-table.h b/gcc/hash-table.h
>> index 0f7e21a..443d16c 100644
>> --- a/gcc/hash-table.h
>> +++ b/gcc/hash-table.h
>> @@ -803,7 +803,10 @@ hash_table<Descriptor, Allocator>::empty_slow ()
>>        m_size_prime_index = nindex;
>>      }
>>    else
>> -    memset (entries, 0, size * sizeof (value_type));
>> +    {
>> +      for ( ; size; ++entries, --size)
>> +	*entries = value_type ();
>> +    }
>>    m_n_deleted = 0;
>>    m_n_elements = 0;
>>  }
> 
> This change sends our periodic testers into an infinite loop.  It is fault of gcc 4.2 being used
> as bootstrap compiler, but perhaps that can be worked around?
> 
> Honza
> 

Same is also true on RHE5 (gcc-4.1).

R.