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cmake_minimum_required (VERSION 3.18...3.19)
project (TestVersionRange LANGUAGES C)
find_package (${Python} ${Python_REQUESTED_VERSION} EXACT COMPONENTS Interpreter)
if (NOT ${Python}_FOUND)
message (FATAL_ERROR "Failed to find ${Python} ${Python_REQUESTED_VERSION}")
endif()
if (Python_REQUESTED_VERSION VERSION_LESS 3.0)
set (IN_VERSION_RANGE 2.0...<3.0)
set (OUT_VERSION_RANGE 2.0...<${${Python}_VERSION})
else()
set (IN_VERSION_RANGE 3.0...<4.0)
set (OUT_VERSION_RANGE 3.0...<${${Python}_VERSION})
endif()
function (FIND_PYTHON EXPECTED_VERSION RANGE)
macro (FIND_PYTHON_PACKAGE)
unset (_${Python}_EXECUTABLE CACHE)
unset (_${Python}_LIBRARY_RELEASE CACHE)
unset (_${Python}_INCLUDE_DIR CACHE)
unset (${Python}_FOUND)
find_package (${Python} ${ARGV})
endmacro()
find_python_package(${RANGE} ${ARGN})
if (EXPECTED_VERSION STREQUAL "NONE")
while (${Python}_FOUND AND ${Python}_VERSION VERSION_GREATER ${Python_REQUESTED_VERSION})
# Possible if multiple versions are installed
# Try with a different range
find_python_package(${Python_REQUESTED_VERSION}.0...<${${Python}_VERSION} ${ARGN})
endwhile()
if (${Python}_FOUND)
message (SEND_ERROR "Unexpectedly found version: ${${Python}_VERSION} for '${Python} ${Python_REQUESTED_VERSION}.0...<${${Python}_VERSION} ${ARGN}'")
endif()
return()
endif()
if (NOT ${Python}_FOUND)
message (SEND_ERROR "Not found: ${Python} ${RANGE} ${ARGN}")
elseif (NOT ${Python}_VERSION VERSION_EQUAL EXPECTED_VERSION)
message (SEND_ERROR "Wrong version: ${${Python}_VERSION} for '${Python} ${RANGE} ${ARGN}'")
endif()
endfunction()
find_python (${${Python}_VERSION} ${IN_VERSION_RANGE} COMPONENTS Interpreter)
if (${Python}_FIND_IMPLEMENTATIONS STREQUAL "IronPython")
find_python (${${Python}_VERSION} ${IN_VERSION_RANGE} COMPONENTS Compiler)
else()
find_python (${${Python}_VERSION} ${IN_VERSION_RANGE} COMPONENTS Development)
endif()
find_python ("NONE" ${OUT_VERSION_RANGE} COMPONENTS Interpreter)
if (${Python}_FIND_IMPLEMENTATIONS STREQUAL "IronPython")
find_python ("NONE" ${OUT_VERSION_RANGE} COMPONENTS Compiler)
else()
find_python ("NONE" ${OUT_VERSION_RANGE} COMPONENTS Development)
endif()
find_python ("NONE" 5...6 COMPONENTS Interpreter)
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