Re: [Boost-build] -ftemplate-depth

From: Vladimir Prus (ghost_at_[hidden])
Date: 2008-07-18 02:28:35

On Friday 18 July 2008 10:17:35 Jurko Gospodnetić wrote:
>    Hi Joel.
> 
> > Hi, bjam -d+2 reveals that with gcc, I get:
> > 
> >    -ftemplate-depth=128
> > 
> > There are some cases where this is not enough. How can I change it?
> > I am doing:
> > 
> >     : requirements <toolset>gcc:<cxxflags>-ftemplate-depth-300
> > 
> > and when I bjam -d+2, I get both:
> > 
> >     -ftemplate-depth=128 and later, -ftemplate-depth=300
> > 
> > while this works, it does not seem to be right.
> 
>    As this gcc parameter seems to be hardcoded in the gcc toolset's 
> (gcc.jam) compile.c++ action code I do not believe there is a way for 
> you to change it without changing the toolset itself.
> 
>    I guess this should be made into a built feature. Then you cuold do 
> the following ': requirements <toolset>gcc:<template-depth>300'. I can 
> do this but I need to know some information first.
> 
>    1. Should this feature be implicit? Other ways to read this question:
>    * Can it cause link-time incompatibilities?
>    * Does it make a difference which of the two correctly built object 
> files you include in your project in case they have been built with 
> different template-depth property values.
>    * Should Boost Build create a separate build folder for each template 
> depth value.
> 
>    2. What are the valid values for this feature?
> 
>    3. Anyone else have any ideas on how to solve this problem better/'in 
> a more generic manner'?

Honestly, I don't think this is a problem worth solving. The second -ftemplate-depth
takes priority, and it's the first time somebody wanted different template depth,
so why care?

- Volodya