detecting ABI version of libraries¶

import os
import re
import sys


macos_abi_pat = re.compile("lib[^\.]+\.([\d\.]+)\.dylib$", re.IGNORECASE)
linux_abi_pat = re.compile("lib[^\.]+\.so\.([\d\.]+)$", re.IGNORECASE)

abi_pat = macos_abi_pat if sys.platform == 'darwin' else linux_abi_pat
SHLIB_EXT = '.dylib' if sys.platform == 'darwin' else '.so'


def detect_abi_version(libname):
    """Return the ABI version of a library
    
    given 'libzmq' return '5' as its ABI version
    because $PREFIX/lib/libzmq.dylib is a symlink to libzmq.5.dylib
    or $PREFIX/lib/libzmq.so is a symlink to libzmq.so.5
    """
    lib = os.path.join(sys.prefix, 'lib', libname + SHLIB_EXT)
    if not os.path.exists(lib):
        raise OSError("%s does not exist" % lib)
    if not os.path.islink(lib):
        print("%s is not a symlink, no ABI info found" % lib)
        # libfoo.dylib is not a symlink, no ABI version to find
        return
    target = os.readlink(lib)
    target_libname = os.path.basename(target)
    match = abi_pat.match(target_libname)
    if not match:
        print("No ABI found in %s" % target_libname)
        return
    return match.group(1)