| cmake_minimum_required(VERSION 3.19...3.20) |
| |
| project(UnversionedNames LANGUAGES NONE) |
| |
| # check if it is possible to find python with a generic name |
| find_program(UNVERSIONED_Python3 NAMES python3) |
| |
| if (NOT UNVERSIONED_Python3) |
| # no generic name available |
| # test cannot be done |
| return() |
| endif() |
| |
| # search with default configuration |
| find_package(Python3 REQUIRED COMPONENTS Interpreter) |
| |
| if (Python3_EXECUTABLE STREQUAL UNVERSIONED_Python3) |
| # default configuration pick-up the generic name |
| # test cannot be completed |
| return() |
| endif() |
| |
| unset(Python3_EXECUTABLE) |
| # Force now to search first for generic name |
| set(Python3_FIND_UNVERSIONED_NAMES FIRST) |
| |
| find_package(Python3 REQUIRED COMPONENTS Interpreter) |
| |
| if (NOT Python3_EXECUTABLE STREQUAL UNVERSIONED_Python3) |
| message(SEND_ERROR "Found unexpected interpreter ${Python3_EXECUTABLE} instead of ${UNVERSIONED_Python3}") |
| endif() |
| |
| # To check value 'NEVER", creates directory holding a symlink to the generic name |
| file(REMOVE_RECURSE "${CMAKE_CURRENT_BINARY_DIR}/bin") |
| file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin") |
| file(CREATE_LINK "${UNVERSIONED_Python3}" "${CMAKE_CURRENT_BINARY_DIR}/bin/python3" SYMBOLIC) |
| |
| unset(Python3_EXECUTABLE) |
| set(Python3_FIND_UNVERSIONED_NAMES FIRST) |
| set(Python3_ROOT_DIR "${CMAKE_CURRENT_BINARY_DIR}") |
| # First search: generic name must be found |
| find_package(Python3 REQUIRED COMPONENTS Interpreter) |
| |
| if (NOT Python3_EXECUTABLE STREQUAL "${CMAKE_CURRENT_BINARY_DIR}/bin/python3") |
| message(FATAL_ERROR "Found unexpected interpreter ${Python3_EXECUTABLE} instead of ${CMAKE_CURRENT_BINARY_DIR}/bin/python3") |
| endif() |
| |
| unset(Python3_EXECUTABLE) |
| set(Python3_FIND_UNVERSIONED_NAMES LAST) |
| |
| # Second search: generic name must be found |
| find_package(Python3 REQUIRED COMPONENTS Interpreter) |
| |
| if (NOT Python3_EXECUTABLE STREQUAL "${CMAKE_CURRENT_BINARY_DIR}/bin/python3") |
| message(FATAL_ERROR "Found unexpected interpreter ${Python3_EXECUTABLE} instead of ${CMAKE_CURRENT_BINARY_DIR}/bin/python3") |
| endif() |
| |
| unset(Python3_EXECUTABLE) |
| set(Python3_FIND_UNVERSIONED_NAMES NEVER) |
| |
| # Third search: generic name must NOT be found |
| find_package(Python3 REQUIRED COMPONENTS Interpreter) |
| |
| if (Python3_EXECUTABLE STREQUAL "${CMAKE_CURRENT_BINARY_DIR}/bin/python3") |
| message(FATAL_ERROR "Found unexpected interpreter ${Python3_EXECUTABLE}") |
| endif() |