(filename, vars=None)
return vars
Parse a Makefile-style file.

    A dictionary containing name/value pairs is returned.  If an
    optional dictionary is passed in as the second argument, it is
    used instead of a new dictionary.
Parse a Makefile-style file.
Parse a Makefile - style file .
def _parse_makefile(filename, vars=None):
    """Parse a Makefile-style file.

    A dictionary containing name/value pairs is returned.  If an
    optional dictionary is passed in as the second argument, it is
    used instead of a new dictionary.
    """
    # Regexes needed for parsing Makefile (and similar syntaxes,
    # like old-style Setup files).
    _variable_rx = re.compile(r"([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*(.*)")
    _findvar1_rx = re.compile(r"\$\(([A-Za-z][A-Za-z0-9_]*)\)")
    _findvar2_rx = re.compile(r"\${([A-Za-z][A-Za-z0-9_]*)}")

    if vars is None:
        vars = {}
    done = {}
    notdone = {}

    with codecs.open(filename, encoding='utf-8', errors="surrogateescape") as f:
        lines = f.readlines()

    for line in lines:
        if line.startswith('#') or line.strip() == '':
            continue
        m = _variable_rx.match(line)
        if m:
            n, v = m.group(1, 2)
            v = v.strip()
            # `$$' is a literal `$' in make
            tmpv = v.replace('$$', '')

            if "$" in tmpv:
                notdone[n] = v
            else:
                try:
                    v = int(v)
                except ValueError:
                    # insert literal `$'
                    done[n] = v.replace('$$', '$')
                else:
                    done[n] = v

    # do variable interpolation here
    variables = list(notdone.keys())

    # Variables with a 'PY_' prefix in the makefile. These need to
    # be made available without that prefix through sysconfig.
    # Special care is needed to ensure that variable expansion works, even
    # if the expansion uses the name without a prefix.
    renamed_variables = ('CFLAGS', 'LDFLAGS', 'CPPFLAGS')

    while len(variables) > 0:
        for name in tuple(variables):
            value = notdone[name]
            m = _findvar1_rx.search(value) or _findvar2_rx.search(value)
            if m is not None:
                n = m.group(1)
                found = True
                if n in done:
                    item = str(done[n])
                elif n in notdone:
                    # get it on a subsequent round
                    found = False
                elif n in os.environ:
                    # do it like make: fall back to environment
                    item = os.environ[n]

                elif n in renamed_variables:
                    if (name.startswith('PY_') and
                        name[3:] in renamed_variables):
                        item = ""

                    elif 'PY_' + n in notdone:
                        found = False

                    else:
                        item = str(done['PY_' + n])

                else:
                    done[n] = item = ""

                if found:
                    after = value[m.end():]
                    value = value[:m.start()] + item + after
                    if "$" in after:
                        notdone[name] = value
                    else:
                        try:
                            value = int(value)
                        except ValueError:
                            done[name] = value.strip()
                        else:
                            done[name] = value
                        variables.remove(name)

                        if (name.startswith('PY_') and
                            name[3:] in renamed_variables):

                            name = name[3:]
                            if name not in done:
                                done[name] = value

            else:
                # bogus variable reference (e.g. "prefix=$/opt/python");
                # just drop it since we can't deal
                done[name] = value
                variables.remove(name)

    # strip spurious spaces
    for k, v in done.items():
        if isinstance(v, str):
            done[k] = v.strip()

    # save the results in the global dictionary
    vars.update(done)
    return vars
def _parse_makefile ( filename , vars = None ) : # Regexes needed for parsing Makefile (and similar syntaxes, # like old-style Setup files). _variable_rx = re . compile ( r"([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*(.*)" ) _findvar1_rx = re . compile ( r"\$\(([A-Za-z][A-Za-z0-9_]*)\)" ) _findvar2_rx = re . compile ( r"\${([A-Za-z][A-Za-z0-9_]*)}" ) if vars is None : vars = { } done = { } notdone = { } with codecs . open ( filename , encoding = 'utf-8' , errors = "surrogateescape" ) as f : lines = f . readlines ( ) for line in lines : if line . startswith ( '#' ) or line . strip ( ) == '' : continue m = _variable_rx . match ( line ) if m : n , v = m . group ( 1 , 2 ) v = v . strip ( ) # `$$' is a literal `$' in make tmpv = v . replace ( '$$' , '' ) if "$" in tmpv : notdone [ n ] = v else : try : v = int ( v ) except ValueError : # insert literal `$' done [ n ] = v . replace ( '$$' , '$' ) else : done [ n ] = v # do variable interpolation here variables = list ( notdone . keys ( ) ) # Variables with a 'PY_' prefix in the makefile. These need to # be made available without that prefix through sysconfig. # Special care is needed to ensure that variable expansion works, even # if the expansion uses the name without a prefix. renamed_variables = ( 'CFLAGS' , 'LDFLAGS' , 'CPPFLAGS' ) while len ( variables ) > 0 : for name in tuple ( variables ) : value = notdone [ name ] m = _findvar1_rx . search ( value ) or _findvar2_rx . search ( value ) if m is not None : n = m . group ( 1 ) found = True if n in done : item = str ( done [ n ] ) elif n in notdone : # get it on a subsequent round found = False elif n in os . environ : # do it like make: fall back to environment item = os . environ [ n ] elif n in renamed_variables : if ( name . startswith ( 'PY_' ) and name [ 3 : ] in renamed_variables ) : item = "" elif 'PY_' + n in notdone : found = False else : item = str ( done [ 'PY_' + n ] ) else : done [ n ] = item = "" if found : after = value [ m . end ( ) : ] value = value [ : m . start ( ) ] + item + after if "$" in after : notdone [ name ] = value else : try : value = int ( value ) except ValueError : done [ name ] = value . strip ( ) else : done [ name ] = value variables . remove ( name ) if ( name . startswith ( 'PY_' ) and name [ 3 : ] in renamed_variables ) : name = name [ 3 : ] if name not in done : done [ name ] = value else : # bogus variable reference (e.g. "prefix=$/opt/python"); # just drop it since we can't deal done [ name ] = value variables . remove ( name ) # strip spurious spaces for k , v in done . items ( ) : if isinstance ( v , str ) : done [ k ] = v . strip ( ) # save the results in the global dictionary vars . update ( done ) return vars