jiridanek commented on a change in pull request #294:
URL: https://github.com/apache/qpid-proton/pull/294#discussion_r573122587



##########
File path: tools/cmake/Modules/FindPython.cmake
##########
@@ -0,0 +1,53 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+# This is a wrapper hack purely so that we can use FindPython
+# with cmake 2.8.12 and its supplied older modules
+
+# 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")
+    if (DEFINED Python_EXECUTABLE)
+        set(PYTHON_EXECUTABLE ${Python_EXECUTABLE})
+    endif ()
+
+    find_package (PythonInterp REQUIRED)
+    # forward compatibility with FindPython
+    set(Python_EXECUTABLE "${PYTHON_EXECUTABLE}")
+    set(Python_LIBRARIES "${PYTHON_LIBRARIES}")
+    set(Python_INCLUDE_DIRS "${PYTHON_INCLUDE_PATH}")

Review comment:
       hmm, PYTHON_INCLUDE_PATH won't be set until I find PythonLibs

##########
File path: tools/cmake/Modules/FindPython.cmake
##########
@@ -0,0 +1,49 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+# This is a wrapper hack purely so that we can use FindPython
+# with cmake 2.8.12 and its supplied older modules
+
+# 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}")
+
+    find_package (PythonLibs ${PYTHON_VERSION_STRING} EXACT)
+    set(Python_Development_FOUND "${PYTHONLIBS_FOUND}")
+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 ()
+
+    if (DEFINED PYTHON_EXECUTABLE)
+        set(Python_EXECUTABLE ${PYTHON_EXECUTABLE})
+    endif ()

Review comment:
       @astitcher if both are set, I'd fail the build. WDYT?




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