[Bug libstdc++/25191] exception_defines.h #defines try/catch

["jason at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #58 from jason at redhat dot com  2008-09-24 19:21 -------
Subject: Re:  exception_defines.h #defines try/catch

l dot lunak at suse dot cz wrote:
> ------- Comment #56 from l dot lunak at suse dot cz  2008-09-24 08:50 -------
> (In reply to comment #55)
>> It seems reasonable to me for try { X } catch... to mean X when
>> -fno-exceptions.  We don't need to error except on throw.
> 
> It seems unreasonable to me that gcc would silently modify code's behaviour,

The change I was talking about doesn't modify behavior.  If there are no 
exceptions, catch blocks will never be executed, so we can optimize them 
away in the presence of -fno-exceptions.

> This program, IIRC, is guaranteed to call "f", as a side-effect of the
> presence of the catch-clause?  Of course, the C++ FE could still process
> the "catch" clause; my only point is that we cannot literally just throw
> away the catch clause.

True, it would be more like { X } if (0) ...

Jason


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25191