# Copyright 2005-2016 The Mumble Developers. All rights reserved. # Use of this source code is governed by a BSD-style license # that can be found in the LICENSE file at the root of the # Mumble source tree or at . # This .pri files finds a suitable Python binary on the system. # # It exposes the found Python binary as the 'PYTHON' qmake variable. # This variable contains the absolute path to a working Python binary. # # Why do we need to do this? # # Some systems (for example, OpenBSD's Python port), are not # PEP 394 (https://www.python.org/dev/peps/pep-0394/) compliant. # # This means that there is no 'python', 'python2' or 'python3' # binaries in the $PATH. # # On those systems, we can't rely on a '#!/usr/bin/env python2' # or similar shebang. We have to query the system for versioned # Python binaries like "python2.7" instead. # # This file does that, by searching in $PATH using the 'which' # tool. # # If no binary is found, an error is shown to the user. # # This script also supports setting a MUMBLE_PYTHON environment # variable to specify an absolute path to a Python binary to use. # Setting this environment variable overrides any querying. win32 { PYTHON = $$(MUMBLE_PYTHON) isEmpty(PYTHON) { PYTHON=python } } else { PYTHON = $$(MUMBLE_PYTHON) isEmpty(PYTHON) { PYTHON=$$system(which python 2>/dev/null) } isEmpty(PYTHON) { PYTHON=$$system(which python2 2>/dev/null) } isEmpty(PYTHON) { PYTHON=$$system(which python2.7 2>/dev/null) } isEmpty(PYTHON) { PYTHON=$$system(which python3 2>/dev/null) } isEmpty(PYTHON) { PYTHON=$$system(which python3.0 2>/dev/null) } isEmpty(PYTHON) { PYTHON=$$system(which python3.1 2>/dev/null) } isEmpty(PYTHON) { PYTHON=$$system(which python3.2 2>/dev/null) } isEmpty(PYTHON) { PYTHON=$$system(which python3.3 2>/dev/null) } isEmpty(PYTHON) { PYTHON=$$system(which python3.4 2>/dev/null) } isEmpty(PYTHON) { PYTHON=$$system(which python3.5 2>/dev/null) } isEmpty(PYTHON) { error("Unable to find the system's Python binary. Some scripts invoked during the Mumble build use Python. You can manually specify it via the MUMBLE_PYTHON environment variable (either 2 or 3).") } }