CMake: reuse object files built for a lib into another lib target

Question

I\'m trying to move my project to CMake, and at the same time have some optimization on the compilation process.

Here\'s the deal:

• I have several sub

Answer 1

As of CMake 2.8.8, you can do this using the OBJECT library type. See mloksot's answer. The old situation was that each target had its own directory and CMake would build every dependent object for every target. This guards against a case where one source file could be used multiple times with different CFLAGS. (Note that by default CMake is more conservative than automake here: automake will stop reusing object files for different targets only if the targets are built with different CFLAGS (and probably CPPFLAGS, too).

Answer 2

You can use the new OBJECT library feature introduced in CMake 2.8.8. The idea is explained here. Basically, the OBJECT library is a similar concept to the convenience library known from Autotools to group object files.

Check the complete CMake OBJECT library tutorial.