[CMake] Adding a dependency

[Wade Williams]

I have a project structure that looks like this:

project
|
| - lib
| ----bin
| ----util
| --------inc
| --------src
| - app
| ----bin
| ----inc
| ----src

In short, each library in the project lives under project/lib.  Built  
libraries are stored in project/lib/bin.  Each library subdirectory  
(i.e. util) has a CMakeLists.txt to build that particular library.  In  
the lib folder is a CMakeLists.txt which does add_subdirectory() on  
all the subdirectories.  So far, so good - works like a charm.

The executable lives under project/app.  The built executable is  
stored in project/app/bin.  There is a CMakeLists.txt in project/app  
to build the application executable.

Now for the problem.  How do I add the libraries as dependencies?

I can't use add_dependencies() because the app/CMakeLists.txt doesn't  
know about the targets in the library directories.  I suppose I could  
do:

add_subdirectory(../../lib ../../lib/bin)

so it would know about those targets, but that doesn't seem the right  
solution.

I can certainly use find_library() to add the built libraries to my  
executable, but then my executable is not dependent upon being them  
and linking will fail if make was not executed in lib first.

Now, I certainly plan to have a project/CMakeLists.txt file that does  
add_subdirectory() on lib and app.  Thus, if someone builds from that  
top level, it should all work if I use find_library() at the  
application level.  However, I'd like it also to work if someone cd's  
into the application directory and types "cmake . ; make".

Any thoughts?

Thanks,

Wade


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