Re: [Boost-build] [boost-build] usage requirements via lib or alias

Subject: Re: [Boost-build] [boost-build] usage requirements via lib or alias
From: Steve Lorimer (steve.lorimer_at_[hidden])
Date: 2015-09-25 09:24:49

Of course - I really should have figured that out by myself!! >.<

Thanks Volodya!

On 25 September 2015 at 01:37, Vladimir Prus <vladimir.prus_at_[hidden]>
wrote:

> On 24-Sep-15 9:45 PM, Steve Lorimer wrote:
>
>> I have the following library:
>>
>> lib model
>> :   [ glob *.cpp *.cc *.h ]
>> :   <cxxflags>-fPIC
>>      <library>/qt5//QtCore/<link>shared
>>      <library>/qt5//QtWidgets/<link>shared
>>      <library>/qt5//QtGui/<link>shared
>> :
>> :
>>      <cxxflags>-fPIC
>> ;
>>
>>
>> Using this library in my app pulls in the required qt libraries and links
>> fine
>>
>> If I replace the qt requirements with an alias, and reference that alias
>> in
>> my library, my app fails to link with "undefined reference"
>>
>> alias qt
>> :
>> :   <cxxflags>-fPIC
>>      <library>/qt5//QtCore/<link>shared
>>      <library>/qt5//QtWidgets/<link>shared
>>      <library>/qt5//QtGui/<link>shared
>> :
>> :
>>      <cxxflags>-fPIC
>> ;
>>
>> lib model
>> :   [ glob *.cpp *.cc *.h ]
>>      qt
>> ;
>>
>>
>> What am I doing wrong?
>>
>
> Steve,
>
> what alias metatarget does is:
>
> 1. Build all sources, adding specified requirements to build properties
> 2. Return all the results, adding specified usage requirements too
>
> Since your alias has no sources at all, part (1) does not do anything, and
> your
> <library> requirements have no effect.
>
> If you move them to usage requirements, things should work.
>
> HTH,
> Volodya
>
>
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