astitcher commented on a change in pull request #294:
URL: https://github.com/apache/qpid-proton/pull/294#discussion_r569466506
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File path: CMakeLists.txt
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@@ -32,7 +32,27 @@ include (CheckPythonModule)
find_package (OpenSSL)
find_package (Threads)
-find_package (PythonInterp REQUIRED)
+# FindPython was added in CMake 3.12, but there it always returned
+# newest Python on the entire PATH. We want to use the first one.
+if (CMAKE_VERSION VERSION_LESS "3.15.0")
+ find_package (PythonInterp REQUIRED)
+ # forward compatibility with FindPython
+ set(Python_EXECUTABLE "${PYTHON_EXECUTABLE}")
+ set(Python_LIBRARIES "${PYTHON_LIBRARIES}")
+ set(Python_INCLUDE_DIRS "${PYTHON_INCLUDE_PATH}")
+ set(Python_VERSION_STRING "${PYTHON_VERSION_STRING}")
+ # for completeness, these are not actually used now
+ set(Python_VERSION_MAJOR "${PYTHON_VERSION_MAJOR}")
+ set(Python_VERSION_MINOR "${PYTHON_VERSION_MINOR}")
+ set(Python_VERSION_PATCH "${PYTHON_VERSION_PATCH}")
+else ()
+ if (POLICY CMP0094) #
https://cmake.org/cmake/help/latest/policy/CMP0094.html
+ cmake_policy(SET CMP0094 NEW) # FindPython should return the first
matching Python on PATH
+ endif ()
+
+ find_package(Python REQUIRED COMPONENTS Interpreter
+ OPTIONAL_COMPONENTS Development)
+endif()
Review comment:
**This is totally the wrong approach!**
We already have a way to "branch" the processing so that we can use newer
features. Create our own FindPython.cmake in tools/cmake/Modules which imitates
the cmake 3 find_package(Python) processing so far as we use it.
Also make sure that any installed script will work with cmake 2.8.12 as our
target environment is cmake 2.8.12 (sadly).
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