[CMake] add_dependencies has a wrong order?

[Michael Wild]

Why, then, don't you simply list the libraries in the correct order in  
the target_link_libraries command? The add_dependencies command only  
has an effect on targets, not external libraries. If indeed, they are  
targets (which doesn't become clear from your code) you should do:

target_link_libraries( dlib_httpclient dlib )

target_link_libraries( ${PROJECT_NAME} dlib_httpclient )


Although, the libraries are static, CMake the remembers that  
dlib_httpclient depends on dlib and in the last link-command you only  
have to specify the dlib_httpclient library and CMake will do the rest  
for you.

HTH

Michael

On 25. Feb, 2009, at 15:22, Steven Van Ingelgem wrote:

> Yes, it has to do something with it...
> Because at least when linking under Linux, if I added dlib BEFORE
> dlib_httpclient (as is now the case), dlib_httpclient will complain  
> about
> undefined symbols.
>
> That's where the add_dependencies would come into play in my honest  
> opinion.
> CMake should calculate the order in which to place the libraries to  
> link
> with to honour all the calls made in the project. So in my case,  
> place dlib
> behind dlib_httpclient.
>
> What you are refering to is not a dependency in linkage, but a  
> dependency in
> compilation. This is fine of course, but is not enough when compiling
> libraries.
>
>
> Greetings,
> Steven
>
>
> 2009/2/25 Michael Wild <themiwi at gmail.com>
>
>> I think you misunderstand add_dependencies. The command adds a  
>> dependency
>> of dlib_httpclient on dlib, i.e. dlib_httplclient DEPENDS ON dlib.  
>> It has
>> nothing to do with the order the libraries appear on the command  
>> line when
>> you link ${PROJECT_NAME}.
>>
>> HTH
>>
>> Michael
>>
>>
>> On 25. Feb, 2009, at 14:15, Steven Van Ingelgem wrote:
>>
>> I have:
>>> add_dependencies(dlib_httpclient dlib)
>>>
>>> But in my cmakelists I have:
>>> TARGET_LINK_LIBRARIES(${PROJECT_NAME} dlib dlib_httpclient)
>>>
>>> Conclusion: it will change itself to "bin/libdlib.a
>>> bin/libdlib_httpclient.a"
>>> instead I would expect "bin/libdlib_httpclient.a bin/libdlib.a" as  
>>> I told
>>> it
>>> to add the dependency.
>>>
>>>
>>> Greetings,
>>> Steven
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