[CMake] Xcode generator ignores shared library made of object libraries

[Gregor Jasny]

Hello Pere,

On 09/03/15 12:59, Pere Mato Vila wrote:
>    I am using cmake version 3.1.3 on MacOSX 10.10.2. I want to build a
> SHARED  library made exclusively of OBJECT libraries. This works well
> with the Makefile generator but fails with the Xcode generator.
>
>    To reproduce the problem is very simple:
> cmake_minimum_required(VERSION 2.8.8 FATAL_ERROR)
>
> add_library(FooObjs OBJECT foo.cxx)
> add_library(Foo SHARED $<TARGET_OBJECTS:FooObjs>)
> add_executable(FooMain main.cxx)
> target_link_libraries(FooMain Foo)
>
>
> The library libFoo.dylib is never build. I can bypass the problem by
> adding a dummy.cxx file to the SHARED library, but I am not convinced
> this is the right solution.

It looks like you did everything right:

 From http://www.cmake.org/cmake/help/v3.1/command/add_library.html
> Some native build systems may not like targets that have only object files, so consider adding at least one real source file to any target that references $<TARGET_OBJECTS:objlib>.

Thanks,
Gregor