Re: strange error 'Duplicate name of actual target'

From: Zbynek Winkler (zwin_at_[hidden])
Date: 2004-01-19 08:57:38

Hi Volodya,

thanks for a such comprehensive explanation. Adding the library to the 
'test' target really solves the problem. However it was a cut down 
example. In the main project the problem arose because of a different 
library. The final fix is to turn the file MCL.cpp into a library of its 
own (which it should have been anyway :-)).

On a different track - wouldn't it be a good idea to start a FAQ file? I 
would also propose to split the documentation to a several files to ease 
the navigation (tutorial, reference, extender's guide etc.) with a 
navigation bar to easily switch among them. Or should I just use the 
boost wiki when I feel like I have an urge help? ;-)

Zbynek

Vladimir Prus wrote:
> Hi Zbynek,
> 
> 
>>When running bjam from within the mcl directory I get this strange
>>output about 'Duplicate name of actural target'. Am I doing something
>>wrong? Thanks.
> 
> 
> You have:
> 
> unit-test test : MCL.cpp ;
> 
> exe gg : MCL.cpp ../number//number ;
> 
> 
> This requests two compilations of MCL.cpp: one for 'test' with default 
> properties, and another for 'gg' with some additional properties -- usage 
> requirements of 'number'.
> 
> Boost.Build notices that properties are different, and believes the built 
> targets should be different as well. But it has no idea how to place those 
> two targets into different directlories -- after all, they differ only by 
> <include>. 
> 
> So, an error is issued. 
> 
> Two solutions is possible.
> 
> 1. If MCL.cpp includes something from 'number', add <use>../number//number to
> usage requirements of the project. In theory, you should be able to write
> 
> unit-test test : MCL.cpp : <use>../number//number ;
> 
> But this will fail with the same error since V2 believes difference in <use> 
> properties is bad too -- which I'll fix right away.
> 
> 2. If you really want MCL.cpp to be compiled twice, place it in some other 
> directory:
> 
> unit-test test : MCL.cpp : <location-prefix>test
> 
> HTH,
> Volodya

-- 
http://zw.matfyz.cz/ http://robotika.cz/
Faculty of Mathematics and Physics, Charles University, Prague, Czech 
Republic