Fix uninitialized variable errors in FindPytest.cmake with -Werror=dev

CMake reported uninitialized variable errors for `LD_LIBRARY_PATH` and
`PYTHONPATH` when using `-Werror=dev --warn-uninitialized`, causing
`pytest_discover_tests` to fail.

Author: corrodedHash

cmake/FindPytest.cmake

@@ -71,8 +71,16 @@ if (Pytest_FOUND AND NOT TARGET Pytest::Pytest)
         endif()
 
         # Convert paths to CMake-friendly format.
-        cmake_path(CONVERT "$ENV{${LIBRARY_ENV_NAME}}" TO_CMAKE_PATH_LIST LIBRARY_PATH)
-        cmake_path(CONVERT "$ENV{PYTHONPATH}" TO_CMAKE_PATH_LIST PYTHON_PATH)
+        if(DEFINED ENV{${LIBRARY_ENV_NAME}})
+            cmake_path(CONVERT "$ENV{${LIBRARY_ENV_NAME}}" TO_CMAKE_PATH_LIST LIBRARY_PATH)
+        else()
+            set(LIBRARY_PATH "")
+        endif()
+        if(DEFINED ENV{PYTHONPATH})
+            cmake_path(CONVERT "$ENV{PYTHONPATH}" TO_CMAKE_PATH_LIST PYTHON_PATH)
+        else()
+            set(PYTHON_PATH "")
+        endif()
 
         # Prepend specified paths to the library and Python paths.
         if (_LIBRARY_PATH_PREPEND)

doc/release/release_notes.rst

@@ -4,6 +4,16 @@
 Release Notes
 *************
 
+.. release:: Upcoming
+
+    .. change:: fixed
+
+        Updated scripts to prevent uninitialized variable errors when using `-Werror=dev
+        <https://cmake.org/cmake/help/latest/manual/cmake.1.html#cmdoption-cmake-Werror>`_
+        and `--warn-uninitialized
+        <https://cmake.org/cmake/help/latest/manual/cmake.1.html#cmdoption-cmake-warn-uninitialized>`_
+        options. Thanks :github_user:`corrodedHash`!
+
 .. release:: 0.11.3
     :date: 2025-01-19