[CMake] How to link archives (.a) into shared object (.so) with cmake ?

[CHEVRIER, Marc]

Set of variable CMAKE_POSITION_INDEPENDENT_CODE must be done BEFORE add_library (… STATIC…).

Are you sure you re-generate makefiles?

This approach works perfectly for me on Linux with GNU compiler.

Marc



On 17/11/15 13:48, "CMake on behalf of houssen" <cmake-bounces at cmake.org on behalf of houssen at ipgp.fr> wrote:

>Unfortunately, that does not work !... But indeed, for me, it should 
>have ?!...
>
>Franck
>
>Le 2015-11-17 12:34, CHEVRIER, Marc a écrit :
>> Hi,
>>
>> Shared libraries required position independent code (PIC) for 
>> objects.
>> By default, in CMake, static libraries objects are not compiled with
>> this mode… So your problem.
>>
>> The easiest solution is to add this line to your CMakeLists.txt file:
>> Set (CMAKE_POSITION_INDEPENDENT_CODE ON)
>>
>> Marc
>>
>>
>>
>>
>> On 17/11/15 11:44, "CMake on behalf of houssen"
>> <cmake-bounces at cmake.org on behalf of houssen at ipgp.fr> wrote:
>>
>>>Hello,
>>>
>>>How to link archives (.a) into shared object (.so) with cmake ?
>>>
>>>I have an archive:
>>>ADD_LIBRARY ( myArchive STATIC ${SRC} )
>>>That I need to link with a shared object:
>>>ADD_LIBRARY ( mySharedObject SHARED ${SRC} )
>>>TARGET_LINK_LIBRARIES ( mySharedObject PUBLIC myArchive )
>>>I get a compilation error that says "you need to compile with -fPIC 
>>> !"
>>>
>>>As far as I understand, I need to use "-Wl,--whole-archive" :
>>>http://stackoverflow.com/questions/7935421/linking-archives-a-into-shared-object-so...
>>>But I can't figure out how to do that with CMake. Could someone help 
>>> ?
>>>
>>>Franck
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