Re: [Boost-build] Duplicate name of actual target. Again :-(

From: Vladimir Prus (ghost_at_[hidden])
Date: 2008-03-25 04:10:56

Roland Schwarz wrote:

> In the hope anyone has idea what could be wrong....
> I know my chances are low, anyone has the same problem. Also it is not
> possible to post the entire project. But perhaps someone ...
> 
> I was succesfull to integrate my pkgspec custom code generator into my
> toolchain.
> This generator, as explained in my previous posts, generates a cpp and
> an hpp file.
> Later on the hpp file is copied over to a install directory. This works
> well under
> windows XP and on my debian box. Funningly the same gives me the following
> "Duplicate name of actual target" error when run on a rock-linux
> distribution.
> I am using the very same boost-build files and a recent bjam. (From trunk.)
> 
> The relevant snippets from the pkgsepc generator jam file:
> ( Caution, there might be a typo in the following since I needed to
> anonymize...
> please ask if in doubt. )
> 
> import generators ;
> import "class" : new ;
> import type ;
> import property ;
> 
> type.register PKGSPEC : psp ;
> 
> rule init ( )
> {
> }
> 
> class pkgspec-generator : generator
> {
>     import property-set ;
> 
>     rule __init__ (
>         id composing ?
>         : source-types *
>         : target-types-and-names +
>         : requirements * )
>     {
>         generator.__init__
>             $(id) $(composing)
>             : $(source-types)
>             : $(target-types-and-names)
>             : $(requirements)
>             ;
>     }
>    
>     rule generated-targets ( sources + : property-set : project name ? )
>     {
>         # remove irrelevant features, i.e. all, since pkgspec does not
>         # generate code that is dependant on any of those
>         return
>             [ generator.generated-targets
>                 $(sources)
>                 : [ property-set.empty ]
>                 : $(project) $(name)
>             ] ;
>     }
> }
> 
> generators.register [ new pkgspec-generator pkgspec.generate.c++ :
> PKGSPEC : CPP HPP ] ;
> 
> actions generate.c++
> {
>     pkgspec -fcpp -fhpp $(>) -o $(<[1]:S=.dummy)
> }
> 
> And the usage in my Jamfile:
> 
> hpp company/dataspec
>     : dataspec.psp
>     ;
> 
> install headers
>     : company/dataspec
>       [ path.glob-tree $(MYLIB_ROOT)/include/company : *.hpp : CVS ]
>     : <install-type>HPP
>       <location>$(DIST_PATH)/include/company
>     ;
> 
> 
> 
> error: Duplicate name of actual target:
> <p/home/rs/mylib/dist/include/company>dataspec.hpp
> error: previous virtual target { common%common.copy-dataspec.hpp.HPP {
> pkgspec%pkgspec.generate.c++-company/dataspec.hpp.HPP {
> dataspec.psp.PKGSPEC } } }

Here, you are installing dataspec.hpp produced by your generator.

> error: created from mylib/build/bb/headers
> error: another virtual target { common%common.copy-dataspec.hpp.HPP {
> /home/rs/projects/mylib/include/company/dataspec.hpp.HPP } }

Here, you are installing file dataspec.hpp that is lying in your tree.

Naturally enough, neither Boost.Build nor I have any idea which file
you actually want to have installed, and whether they are identical.

Why are you trying to install both?

- Volodya