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https://issues.apache.org/jira/browse/PROTON-2774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17778059#comment-17778059
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ASF subversion and git services commented on PROTON-2774:
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Commit b3d929c05b82aff891ff63ea606f9afc37a0992d in qpid-proton's branch
refs/heads/main from Jiri Daněk
[ https://gitbox.apache.org/repos/asf?p=qpid-proton.git;h=b3d929c05 ]
PROTON-2774: replace `CMAKE_SOURCE_DIR` variable with `PROJECT_SOURCE_DIR`
(#410)
This change is the first step in an effort to allow the CMake build file
to work as an embedded subproject in an composite CMake build.
> 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
> Priority: Major
> 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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