On 2013-08-26 15:16, Thomas Taranowski wrote:
I have the following build structure:workspace/ CMakeLists.txt # top level cmake component_a/ CMakeLists.txt # component cmake src/ # source in here component_b/ CMakeLists.txt # component cmake src/ # source in here Now, I'm trying to implement a multi-stage build which does the following: 1) builds some external third-party dependencies. 2) auto-generate some code 3) build the source 4) package the result
In my experience... 1-3 and 4 are covered by the 'all' and 'package' targets, respectively. If your dependencies are properly expressed, I would not expect 2 to be a target, and the parts of 1 needed by 2-3 will be built automatically. (If you really want, it is trivial to add a custom target that depends on whatever third-party pieces you have.)
I've seen two common methods for dealing with third-party packages: build them in the same CMake hierarchy as everything else, or build them as external projects. In the latter case, your main project must also be an external project in order to ensure the third party pieces are fully built before the main part of your project configures.
In either case, there is usually an option to use the 'internal' version of a third-party component or to supply an external version. The main project relies on find modules / configs to find third party components, and your build driver (i.e. the root CMakeLists.txt) sets whatever variables are necessary to use or find the internal version so that the consumers thereof don't need to care about the difference.
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