[boost] sprit 1.6 support (Was: [Report] 2749 regressions on RC_1_34_0 (2007-01-24))

From: Vladimir Prus (ghost_at_[hidden])
Date: 2007-01-26 10:38:19

Roland Schwarz wrote:

> Nicola Musatti wrote:
>> I have a working implementation, I'll post it tonight (GMT+1) from home,
>> as I cannot post attachments from Gmane's web interface. The gist of it
>> is the following function:
> 
> <snipped>
> 
> Based on your posting I tried to port the serialization.jam to bbv2.
> 
> It is almost working, however I need help with site-config.jam:
> 
> Here is what I have:
> 
> 1) libs/serialization/build/Jamfile.v2:
> 
> On the top:
> import serialization ;
> 
> project boost/serialization
>      : source-location ../src
>      : requirements
> <conditional>@serialization.require-boost-spirit-support
>      ;
> 
> 2) libs/serialization/build/serialization.jam:
> 
> rule require-boost-spirit-support ( properties * )
> {
>      local result ;
>      local req-legacy = false ;
> 
>      if <toolset-msvc:version>6.5      in $(properties)
> { req-legacy = true ; }
>      if <toolset-borland:version>8.5.2 in $(properties)
> { req-legacy = true ; }
> 
>      if $(req-legacy) = true {
>              result += <use>/site-config//spirit-1.6 ;
>      }
> 
>      return $(result) ;
> }
> 
> 
> 3) In site-config.jam:
> 
> project site-config ;
> alias spirit-1.6 : : : : <cxxflags>-I"H:/Projects/boost/SPIRIT_RC_1_6_2" ;
> 
> This seems to work fine. The problem is, that when the alias entry is
> missing from site-config the build aborts with an error, instead of just
> skipping the build of this particular library.
> 
> A work around would be to define only the path to the spirit-1.6 in
> site-config.jam, and return <build>no from require-boost-spirit-support
> when not available.
> 
> I was not able to find out how to do this.

Put 

        path-constant SPIRIT_1_6_whatever : some_value ;

to user-config.jam or to site-config.jam. In your rule, use:

        if $(SPIRIT_1_6_whatever)
        {
                ...
        }

This should work.

- Volodya