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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()
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