Re: [Boost-build] -ftemplate-depth

From: Jurko Gospodnetić (jurko.gospodnetic_at_[hidden])
Date: 2008-07-18 02:17:35

   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'?

   Best regards,
     Jurko Gospodnetić