Re: [Boost-build] [PATCH] -ftemplate-depth

From: Ilya Sokolov (fal_delivery_at_[hidden])
Date: 2008-07-30 08:01:56

Markus Schöpflin wrote:
> Ilya Sokolov wrote:
> 
> [...]
> 
>> Why not use <cxxflags> instead of <c++-template-depth> as the value is 
>> toolset-dependent anyway?
> 
> Are you questioning the wisdom of the existence of the 
> <c++-template-depth> feature itself?
> 
> A real big advantage is that its existence allows to write
> 
>  foo.cxx : : : <c++-template-depth>bar ;

No, template-depth is an internal constant of the compiler, so most 
probably its value will be different on each of them, i.e.

<toolset>gcc:<c++-template-depth>bar-1
<toolset>qcc:<c++-template-depth>bar-2
<toolset>cxx:<c++-template-depth>bar-3
<toolset>acc:<c++-template-depth>bar-4

> instead of
> 
>  foo.cxx : : :  <toolset>gcc:<cxxflags>-ftemplate-depth-bar
>                 <toolset>qcc:<cxxflags>-ftemplate-depth-bar
>                 <toolset>cxx:<cxxflags>"-pending_instantiations bar"
>                 <toolset>acc:<cxxflags>"whatever"
>                 ... ;

Should be:

<toolset>gcc:<cxxflags>-ftemplate-depth-bar-1
<toolset>qcc:<cxxflags>-ftemplate-depth-bar-2
<toolset>cxx:<cxxflags>"-pending_instantiations bar-3"
<toolset>acc:<cxxflags>"whatever"

> Markus
> 
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