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# -*- cmake -*-
set(PYTHONINTERP_FOUND)
if (DEFINED ENV{PYTHON})
# Allow python executable to be explicitly set
set(python "$ENV{PYTHON}")
set(PYTHONINTERP_FOUND ON)
elseif (WINDOWS)
# On Windows, explicitly avoid Cygwin Python.
# if the user has their own version of Python installed, prefer that
foreach(hive HKEY_CURRENT_USER HKEY_LOCAL_MACHINE)
# prefer more recent Python versions to older ones, if multiple versions
# are installed
foreach(pyver 3.11 3.10 3.9 3.8 3.7)
list(APPEND regpaths "[${hive}\\SOFTWARE\\Python\\PythonCore\\${pyver}\\InstallPath]")
endforeach()
endforeach()
# TODO: This logic has the disadvantage that if you have multiple versions
# of Python installed, the selected path won't necessarily be the newest -
# e.g. this GLOB will prefer Python310 to Python311. But since pymaybe is
# checked AFTER the registry entries, this will only surface as a problem if
# no installed Python appears in the registry.
file(GLOB pymaybe
"$ENV{PROGRAMFILES}/Python*"
## "$ENV{PROGRAMFILES(X86)}/Python*"
# The Windows environment variable is in fact as shown above, but CMake
# disallows querying an environment variable containing parentheses -
# thanks, Windows. Fudge by just appending " (x86)" to $PROGRAMFILES and
# hoping for the best.
"$ENV{PROGRAMFILES} (x86)/Python*"
"c:/Python*")
find_program(python
NAMES python3.exe python.exe
NO_DEFAULT_PATH # added so that cmake does not find cygwin python
PATHS
${regpaths}
${pymaybe}
)
include(FindPythonInterp)
else()
find_program(python python3)
if (python)
set(PYTHONINTERP_FOUND ON)
endif (python)
endif (DEFINED ENV{PYTHON})
if (NOT python)
message(FATAL_ERROR "No Python interpreter found")
endif (NOT python)
set(PYTHON_EXECUTABLE "${python}" CACHE FILEPATH "Python interpreter for builds")
mark_as_advanced(PYTHON_EXECUTABLE)
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