Re: [Bug-gnubg] Building on Ubuntu 14.04 : Temporary Workaround

[Philippe Michel]

On Mon, 27 Jul 2015, Michael Petch wrote:

> I sent you an email that seems to suggest the issue is with
> Optimizations (-O0 seems to work) / compiling with --std=c99 / and some
> issue with the C Runtime (And it could be related to something in our
> code that makes this appear. If it is a bug it is something that seems
> to affect the runtime code prior to main() being called.
>
> The error you see under Ubuntu 15.04 is actually the same thing I see on
> 14.04 depending on the optimization level I use.
>
> If I remove all the std=c99 stuff from configure.ac that has been added
> then it seems to work fine no matter the optimization level.

The problem seems not to be specific to Ubuntu, but triggered by compiling 
as C99 with _FORTIFY_SOURCE=2 (which Ubuntu's gcc slyly does).

Undefining the latter on Ubuntu prevents gnubg from hanging, compiling 
with it on some other distributions or on Ubuntu with clang causes a 
similar issue.

It's a bit surprising that gnubg hangs. I would expect it to abort if 
fortify_source detects something suspect (that's what happens when built 
with clang).