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Set hints to find the python version we actually want. #150

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Feb 20, 2024
Merged

Set hints to find the python version we actually want. #150

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16 changes: 16 additions & 0 deletions rosidl_typesupport_c/cmake/rosidl_typesupport_c_generate_interfaces.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,22 @@ rosidl_write_generator_arguments(
TARGET_DEPENDENCIES ${target_dependencies}
)

# By default, without the settings below, find_package(Python3) will attempt
# to find the newest python version it can, and additionally will find the
# most specific version. For instance, on a system that has
# /usr/bin/python3.10, /usr/bin/python3.11, and /usr/bin/python3, it will find
# /usr/bin/python3.11, even if /usr/bin/python3 points to /usr/bin/python3.10.
# The behavior we want is to prefer the "system" installed version unless the
# user specifically tells us othewise through the Python3_EXECUTABLE hint.
# Setting CMP0094 to NEW means that the search will stop after the first
# python version is found. Setting Python3_FIND_UNVERSIONED_NAMES means that
# the search will prefer /usr/bin/python3 over /usr/bin/python3.11. And that
# latter functionality is only available in CMake 3.20 or later, so we need
# at least that version.
cmake_minimum_required(VERSION 3.20)
cmake_policy(SET CMP0094 NEW)
set(Python3_FIND_UNVERSIONED_NAMES FIRST)

find_package(Python3 REQUIRED COMPONENTS Interpreter)

get_used_typesupports(typesupports "rosidl_typesupport_c")
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16 changes: 16 additions & 0 deletions rosidl_typesupport_cpp/cmake/rosidl_typesupport_cpp_generate_interfaces.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,22 @@ rosidl_write_generator_arguments(
TARGET_DEPENDENCIES ${target_dependencies}
)

# By default, without the settings below, find_package(Python3) will attempt
# to find the newest python version it can, and additionally will find the
# most specific version. For instance, on a system that has
# /usr/bin/python3.10, /usr/bin/python3.11, and /usr/bin/python3, it will find
# /usr/bin/python3.11, even if /usr/bin/python3 points to /usr/bin/python3.10.
# The behavior we want is to prefer the "system" installed version unless the
# user specifically tells us othewise through the Python3_EXECUTABLE hint.
# Setting CMP0094 to NEW means that the search will stop after the first
# python version is found. Setting Python3_FIND_UNVERSIONED_NAMES means that
# the search will prefer /usr/bin/python3 over /usr/bin/python3.11. And that
# latter functionality is only available in CMake 3.20 or later, so we need
# at least that version.
cmake_minimum_required(VERSION 3.20)
cmake_policy(SET CMP0094 NEW)
set(Python3_FIND_UNVERSIONED_NAMES FIRST)

find_package(Python3 REQUIRED COMPONENTS Interpreter)

get_used_typesupports(typesupports "rosidl_typesupport_cpp")
Expand Down