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#!/usr/bin/env bash
# This script checks various names for the Python interpreter for their existance and version.
# The latest valid version is used to run the SCons build tool, which requires python2.
# This is needed because some distributions ship Pyhton3 and others Python2 their 'python'.
function is_supported_python
{
local exe=$1
$exe -c 'import sys; (major, minor, a, b, c) = sys.version_info; python_version = (major, minor); exit(not ((2, 4) <= python_version <= (2, 7)))' 2>/dev/null
}
declare -a supported_python_versions=(python python2.7 python2.6 python2.5 python2.4)
for exe in ${supported_python_versions[*]}; do
if is_supported_python "$exe"; then
exec $exe `dirname $0`/3rdParty/SCons/scons.py "$@"
exit
fi
done
echo "No suitable Python interpreter found! Swift build system supports Python 2.4 to Python 2.7.!!!" >&2
exit 1
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