[Dune] C++ visibility

[Steffen Müthing]

One easy optimization would be to add -fvisibility-inlines-hidden to CXXFLAGS,
as that already removes a lot of symbols due to the large amount of inline methods
in DUNE (at least when compiling optimized code, but if you are debugging, you
probably don't care that much anyway). I have been using it for about a year now
and have not had any problems - the only important part is that you need to compile
your complete stack either with or without it, including libraries like ALUGrid, UG,
SuperLU etc. Otherwise danger may robinson...

Steffen


Am 30.11.2010 um 11:11 schrieb Oliver Sander:

> The visibility stuff has been in gcc for quite a while.
> To me, library load times and sizes never seemed to be a
> problem in Dune.  Better optimization is of course always
> welcome, however I find it difficult from the description
> to estimate the actual impact on code such as ours.
> How would a decent benchmark look, and could that
> be done with reasonable effort?
> 
> --
> Oliver
> 
> Am 30.11.2010 10:46, schrieb Christian Engwer:
>> Dear all,
>> 
>> concerning library load times and compiler optimizations, I'd like to
>> bring the following g++ article to your attention.
>> 
>> http://gcc.gnu.org/wiki/Visibility
>> 
>> I'm not sure how much work it would be to make use of "visibility" in
>> Dune, but on the long term scale we should have a look into this.
>> 
>> Christian
>> 
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>>   
> 
> 
> -- 
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> * Oliver Sander                ** email: sander at mi.fu-berlin.de        *
> * Freie Universität Berlin     ** phone: + 49 (30) 838 75348           *
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Steffen Müthing
Universität Stuttgart
Institut für Parallele und Verteilte Systeme
Universitätsstr. 38
70569 Stuttgart
Tel: +49 711 685 88429
Fax: +49 711 685 88340
Email: steffen.muething at ipvs.uni-stuttgart.de