[jira] [Created] (PROTON-2774) Support composite CMake builds

["Jiri Daněk (Jira)" <ji...@apache.org>]

Jiri Daněk created PROTON-2774:
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             Summary: Support composite CMake builds
                 Key: PROTON-2774
                 URL: https://issues.apache.org/jira/browse/PROTON-2774
             Project: Qpid Proton
          Issue Type: Improvement
          Components: build, proton-c
    Affects Versions: proton-c-0.39.0
            Reporter: Jiri Daněk
            Assignee: Jiri Daněk
             Fix For: proton-c-0.40.0


CMake recognizes the notion that project may be either top-level, or included from other projects that intend to depend on it.

https://cmake.org/cmake/help/latest/variable/PROJECT_IS_TOP_LEVEL.html

This inclusion is performed either with add_subdirectory() or by FetchContent_MakeAvailable().

There are several preconditions for this to work

#. proton must compile cleanly with whatever compile (warning) flags the top-level project sets; I intend to clean proton so that it compiles with qpid-dispatch/skupper-router flags
#. CMakeLists.txt need to be written to not assume that CMAKE_SOURCE_DIRECTORY corresponds to the currently active project. Use the PROJECT_SOURCE_DIRECTORY and similar variables instead.
#. targets in CMakeLists.txt must be written so that they can be immediately used by the including projects
#. tests and other miscellaneous parts of the project should not be enabled when proton is not the top-project

As an example, the Google Test project supports this kind of composite builds.



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