ext2lang = {
    '.cpp': 'c++',
    '.c': 'c',
}

ext2lang = {
    '.c'  : 'c',
    '.cpp': 'c++',
    '.cc' : 'c++',
    '.cp' : 'c++',
    '.cxx': 'c++',
    '.CPP': 'c++',
    '.c++': 'c++',
    '.C'  : 'c++',
}

Support more C++ extensions by default
Support more C++ extensions by default
