deps

#!/usr/bin/env python

import os
import re
import popen2
import sys
import tempfile

libc = '/usr/lib/libc.a'
tmp = tempfile.mktemp()

# create dictionary s2o: symbol name -> (.o name (in libc.a), type (e.g., 'T'))
def gets2o():
    s2o = {}
    r = re.compile(r'.*\[([.\-\w]+)\]: (\w+) ([WwtTCBRD])')
    nm = ['nm','-A','-fposix',libc]
    (ignore_in,f,ignore_err) = os.popen3(' '.join(nm))
    for line in f:
        m = r.findall(line)
        if 0 == len(m):
            continue;
        m = m[0]
        if s2o.has_key(m[1]):
            t = s2o[m[1]][1]
            if t != 'w' and t != 'W':
                continue;
        s2o[m[1]] = (m[0],m[2])
    f.close()
    del f
    return s2o

objs = sys.argv[1:]
if 0 == len(objs):
    print 'no objects specified'
    sys.exit(1)

cc = ['gcc','-o',tmp,'-shared','-nostartfiles','-Xlinker','-Bsymbolic']
nm = ['nm','-fposix','-u',tmp]
ar = ['ar','-x',libc]

xx = gets2o()
extract = []
while 1:
    p = popen2.Popen3(' '.join(cc+objs+extract), 1)
    p.wait()
    del p

    f = os.popen(' '.join(nm),'r')
    l = len(extract)
    for line in f:
	sym = line.split()[0];
        sym = sym.split('@')[0]
        sym = sym.strip()
        if not xx.has_key(sym):
            print 'error: unknown undefined symbol', sym
            sys.exit(1)
        o = xx[sym][0]
        if not o in extract:
            p = popen2.Popen3(' '.join(ar+[o]))
            p.wait()
            del p
            extract.append(o)
    f.close()
    del f
    if len(extract) == l:
        break
os.remove(tmp)
print ' '.join(extract)