[buildd-tools-devel] Bug#778112: Bug#778112: Bug#778112: Bug#778112: schroot: ftbfs with GCC-5

[Roger Leigh]

On 26/07/2015 08:50, Matthias Klose wrote:
> On 07/26/2015 12:09 AM, Roger Leigh wrote:
>> On 25/07/2015 22:07, Roger Leigh wrote:
>>> On 25/07/2015 21:45, Roger Leigh wrote:
>>>
>>>> OK, some further investigation has shown what the exact error is.  It
>>>> looks like a GCC bug.  Please see the attached source file testcase.
>>>> This regex is failing:
>>>>
>>>>     std::regex("^[a-z0-9][a-z0-9-]*$", std::regex::extended);
>>>>
>>>> however this one works:
>>>>
>>>>     std::regex("^[a-z0-9][-a-z0-9]*$", std::regex::extended);
>>>
>>> In the same vein, the attached sample using basic rather than extended
>>> expressions fails in the opposite way. In this case both compile but the
>>> latter expression fails to match correctly. Since the expression should
>>> be valid and behave the same in both cases, it looks like there are two
>>> bugs here, the first being unable to compile a valid extended regex, the
>>> second here being unable to match (which is likely also a compile
>>> failure, but not a fatal one).
>>
>> Note this latter issue is seen with GCC 4.9 but appears to work with GCC 5.
>
> now forwarded as https://gcc.gnu.org/PR67015
>
> however I can't see different behaviour with 4.9 and 5 (making sure to use the
> corresponding library using -static-libstdc++). Also I see regex2.cc always
> succeeding.

Note I used GCC 4.9.2 in jessie.  This fails every time with or without 
-static-libstdc++.  GCC 4.9.3 in sid does not exhibit this behaviour, so 
it was likely just fixed with the 4.9.3 release.


Regards,
Roger