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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