[Bug c++/14563] octave built under Cygwin very slow

["paulthomas2 at wanadoo dot fr" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From paulthomas2 at wanadoo dot fr  2004-03-25 06:40 -------
Subject: Re:  octave built under Cygwin very slow

Danny,

I am away from base right now and do not have access to any of the 
installations - Ben Diedrich can supply you with the version number for 
the "good" gcc; ie. that of the octave-forge binary distribution.  For 
your information, Ben tells me  that the slow build, with profiling, 
runs slightly more than three times more slowly than the fast build with 
profiling.  Since the only significant difference in the profiles is the 
presence in the slow build of sjlj calls,..... j'accuse!  Otherwise, the 
problem must lie in something outside the scope of the profiling.

If "W" does not automatically get this, could you ensure that it is 
forwarded to him, please?

Paul Thomas

PS Thank you both for your rapid responses to this problem; it is 
something that has been perplexing us a lot.

dannysmith at users dot sourceforge dot net wrote:

>------- Additional Comments From dannysmith at users dot sourceforge dot net  2004-03-24 22:58 -------
>I am a bit unclear what version of gcc was used for the "fast" precompiled 
>octave.  Was it really gcc-3.2.3 or gcc-3.2-3 (the third cygwin update of gcc-
>3.2.0)?
>
>What does gcc -v say for the gcc that built the "fast" octave. 
>
>The cygwin gcc-3.2 distro's (dated about August 2002) had a local patch that 
>enabled Dwarf2 exceptions.  This worked fine except when functions throwing 
>exceptions were used as callbacks by win32api functions. So the experimented 
>was terminated and the EH model was reverted to sjlj in later binary distro's 
>of gcc.
>
>If this is really a difference between sjlj and Dwarf2, I think it is time to 
>revisit Dwarf2 support on windows targets.
>
>Danny
>
>  
>




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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14563