Re: [Boost-build] -ftemplate-depth

From: Juergen Hunold (juergen.hunold_at_[hidden])
Date: 2008-07-19 10:21:41

Hi Jurko !

On Friday 18 July 2008 08:17:35 Jurko Gospodnetić wrote:

>    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?

No.

>    * 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.

No

>    * Should Boost Build create a separate build folder for each template
> depth value.

No. This would be overkill for a compiler setting...

>    2. What are the valid values for this feature?
From the gcc man page (4.2.3)
      -ftemplate-depth-n
Set the maximum instantiation depth for template classes to n.  A limit on the 
template instantiation depth is needed to detect endless recursions during 
template class instantiation.  ANSI/ISO C++ conforming programs must not rely 
on a maximum depth greater than 17

So I think every number greater than the default should be allowed.

>    3. Anyone else have any ideas on how to solve this problem better/'in
> a more generic manner'?

Well, most compiler do not have a switch for changing the instantiation depth. 
So I doubt that a more generic solution is required.

Yours,

Jürgen
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