[Boost-build] main-target-alternative howto (was Re: bbv2/extender.html#bbv2.extending.rules glib (slightly modified) example fails.

From: Larry Evans (cppljevans_at_[hidden])
Date: 2007-09-06 12:34:34

On 09/05/07 14:19, Vladimir Prus wrote:
[snip]
> 
> Just calling a function does not automatically creates a main target.
> There are just two ways to create a main target:
> 
>         - Call the targets.main-target-alternative
>         - Call some existing rule that creates main target. That will
>         will eventually call targets.main-target-alternative
> 
I tried the 1st way by modifying:

http://svn.boost.org/trac/boost/browser/trunk/tools/build/v2/example/customization/Jamfile

as follows:
<--- cut here ---
import verbatim ;
import targets ;

exe codegen : codegen.cpp class.verbatim usage.verbatim
     t1.verbatim ;

targets.main-target-alternative t1_cpp ;

verbatim t1_cpp : t1.verbatim ;
 >--- cut here ---
but when I tried to create t1_cpp target, got:
<--- cut here ---
cd 
/home/evansl/prog_dev/boost-svn/ro/trunk/tools/build/v2/example/customization/
bjam t1_cpp
/home/evansl/prog_dev/boost-svn/ro/trunk/tools/build/v2/build/targets.jam:1523: 
in targets.main-target-alternative
rule t1_cpp.project unknown in module targets.
Jamfile:10: in load-aux
/home/evansl/prog_dev/boost-svn/ro/trunk/tools/build/v2/build/project.jam:318: 
in load-jamfile
/home/evansl/prog_dev/boost-svn/ro/trunk/tools/build/v2/build/project.jam:68: 
in load
/home/evansl/prog_dev/boost-svn/ro/trunk/tools/build/v2/build/project.jam:170: 
in project.find
/home/evansl/prog_dev/boost-svn/ro/trunk/tools/build/v2/build-system.jam:239: 
in load
/home/evansl/prog_dev/boost-svn/ro/trunk/tools/build/v2/kernel/modules.jam:261: 
in import
/home/evansl/prog_dev/boost-svn/ro/trunk/tools/build/v2/kernel/bootstrap.jam:132: 
in boost-build
/home/evansl/prog_dev/boost-svn/ro/trunk/tools/build/v2/example/boost-build.jam:6: 
in module scope
 >--- cut here ---
Could you please let me know how to correct this?

TIA.