multilib and with/without exceptionsand rtti

multilib and with/without exceptionsand rtti

[Henning Baldersheim]

Hi

I would like to have different libraries for use with and without 
exceptions. The reason is codesize. I see that when I use any features from 
stl, almost everything is linked in due to libsup++ compiled with 
exceptions. functexecpt.cc makes references all over the place.

So I thought that then I could use the multilib feature to make different 
libraries. I have looked at gccint.info and Fragments there. It worked well 
when I added the fexception/fno-exception option. However I would like to 
use the pair -fexceptions -frtti and -fno-exceptions -fno-rtti. Especially 
since -fno-rtti is incompatible with -exceptions. I tried excluding 
*fexception/*fno-rtti. It almost worked, but since the default is 
-fexceptions -frtti, it failed when it applied only -fno-rtti.

How do I go about to do what I want most elegantly ?
Is it possible so say that -fno-rtti requires -fno-exceptions ?

Henning

Re: multilib and with/without exceptionsand rtti

[Jim Wilson]

Henning Baldersheim wrote:
> It worked well when I added the fexception/fno-exception option. However 
> I would like to use the pair -fexceptions -frtti and -fno-exceptions 
> -fno-rtti.

The multilib support isn't designed to solve this problem.  It works 
only for single options.

I think you can sort of get the behaviour you want if you use 
MULTILIB_MATCHES to map the -f{,no-}rtti options to -f{,no-}exceptions, 
and then hack the specs to force rtti on if exceptions is on, and vice 
versa, and likewise for the no- versions of the options.
-- 
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com