[CMake] linkage order of static libraries and object files (ENABLE_EXPORTS)

[Petr Kmoch]

Hi Ivan.

The correct use of OBJECT libraries is not to link against them, but to
list them as sources (using a special syntax), like this:

add_executable(project main.c $<TARGET_OBJECTS:serial>)

(Assuming 'serial' is the name of the object library). This is outlined in
the documentation for OBJECT libraries.

Petr


On Sat, Nov 2, 2013 at 7:50 AM, Ivan Sergio Borgonovo
<mail at webthatworks.it>wrote:

> I'm trying to convert an embedded eclipse project to CMake with a
> python script.
>
> I reached a point where everything compile as I want, everything get
> listed in the linking step but libraries are in the wrong order and
> linking fail.
>
> Just reordering the libraries list and running the linking process by
> hand produce the right executable.
>
> I want to convert the project in a completely automatic way and I don't
> want my python code to get too complicated to understand
> inter-libraries dependencies to write smarter CMakeLists.txt files or
> to order properly the libraries unless there is a very simple way to do
> so. This would be sweet but I don't think there is a simple way.
>
> Eclipse was compiling everything as objects so order of linking was not
> important.
>
> I've tried to follow
> http://www.cmake.org/Wiki/CMake/Tutorials/Object_Library
> I get
>
> CMake Error at cmakedirs.cmake:118 (target_link_libraries):
>   Target "serial" of type OBJECT_LIBRARY may not be linked into another
>   target.  One may link only to STATIC or SHARED libraries, or to
> executables with the ENABLE_EXPORTS property set.
> Call Stack (most recent call first):
>   CMakeLists.txt:89 (include)
>
> for all libraries
>
> But I can't get rid of the same error even when I add:
> add_executable(project main.c)
> set_target_properties(project PROPERTIES ENABLE_EXPORTS ON) #<--
>
>
> --
> Ivan Sergio Borgonovo
> http://www.webthatworks.it
>
> --
>
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