clang-3.4 hangs on package alliance 5.0-20120515-6

[Sylvestre Ledru]

On 08/04/2014 23:28, Nicolas Sévelin-Radiguet wrote:
> On 04/08/2014 10:51 PM, Sylvestre Ledru wrote:
>> On 08/04/2014 21:36, Nicolas Sévelin-Radiguet wrote:
>>> Hello everyone,
>>>
>>> While fixing some FTBFS with clang instead of gcc, I came across a bug
>>> in clang (at least I think so).
>>>
>>> The package I am working on is alliance 5.0-20120515-6 [0] which is
>>> failing to build due to -Wreturn-type errors [1]. After applying the
>>> following patch [2] to get rid of these, clang hangs (eats CPU) and
>>> nothing happens even after a few minutes [3].
>>> The files needed to reproduce this behavior are here [4]:
>>> - expy-0fa6b4.sh is the command line
>>> - expy-0fa6b4.c is the source
>>>
>>> The source, with the patch applied, builds fine with gcc [5].
>>> Please note that I am not familiar at all with this particular package.
>> Is it this bug ?
>> http://clang.debian.net/status.php?version=3.4&key=BUILD_TIMEOUT ?
>> http://llvm.org/bugs/show_bug.cgi?id=16821
>>
>> Thanks
>> S
>>
> Humm, looks like it.
> When modifying the command line (the rest of the line being the same):
> -D "_FORTIFY_SOURCE=2" -O2 hangs
> -D "_FORTIFY_SOURCE=2" -O1 works
> -O2 hangs
> -O1 works.
> So it looks like even without -D "_FORTIFY_SOURCE=2", clang hangs.
Oh.
A reduced test case of this file could help and, if different from bug
16821, please report it :)

Thanks,
Sylvestre