#! /bin/sh -e

# DP: ctypes.util.find_library(): Determine the shared object name of a library
# DP: using ldconfig only, only fall back to objdump/gcc if ldconfig fails.
# DP: Raise exceptions if gcc or objdump cannot be found.

dir=
if [ $# -eq 3 -a "$2" = '-d' ]; then
    pdir="-d $3"
    dir="$3/"
elif [ $# -ne 1 ]; then
    echo >&2 "usage: `basename $0`: -patch|-unpatch [-d <srcdir>]"
    exit 1
fi
case "$1" in
    -patch)
        patch $pdir -f --no-backup-if-mismatch -p0 < $0
        ;;
    -unpatch)
        patch $pdir -f --no-backup-if-mismatch -R -p0 < $0
        ;;
    *)
	echo >&2 "usage: `basename $0`: -patch|-unpatch [-d <srcdir>]"
        exit 1
esac
exit 0

--- Lib/ctypes/util.py~	2009-01-04 17:48:19.000000000 +0100
+++ Lib/ctypes/util.py	2009-01-04 18:10:45.000000000 +0100
@@ -49,18 +49,20 @@
         expr = r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
         fdout, ccout = tempfile.mkstemp()
         os.close(fdout)
-        cmd = 'if type gcc >/dev/null 2>&1; then CC=gcc; else CC=cc; fi;' \
+        cmd = 'if type gcc >/dev/null 2>&1; then CC=gcc; elif type cc >/dev/null 2>&1; then CC=cc;else exit 10; fi;' \
               '$CC -Wl,-t -o ' + ccout + ' 2>&1 -l' + name
         try:
             f = os.popen(cmd)
             trace = f.read()
-            f.close()
+            rv = f.close()
         finally:
             try:
                 os.unlink(ccout)
             except OSError, e:
                 if e.errno != errno.ENOENT:
                     raise
+        if rv == 10:
+            raise OSError, 'gcc or cc command not found'
         res = re.search(expr, trace)
         if not res:
             return None
@@ -82,7 +84,13 @@
             # assuming GNU binutils / ELF
             if not f:
                 return None
-            cmd = "objdump -p -j .dynamic 2>/dev/null " + f
+            cmd = 'if ! type objdump >/dev/null 2>&1; then exit 10; fi;' \
+                  "objdump -p -j .dynamic 2>/dev/null " + f
+            f = os.popen(cmd)
+            dump = f.read()
+            rv = f.close()
+            if rv == 10:
+                raise OSError, 'objdump command not found'
             res = re.search(r'\sSONAME\s+([^\s]+)', os.popen(cmd).read())
             if not res:
                 return None
@@ -115,6 +123,8 @@
 
     else:
 
+        import platform
+
         def _findLib_ldconfig(name):
             # XXX assuming GLIBC's ldconfig (with option -p)
             expr = r'/[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)
@@ -128,8 +138,24 @@
                     return None
             return res.group(0)
 
+        def _findSoname_ldconfig(name):
+            mach_map = {
+                'x86_64': 'libc6,x86-64',
+                'ppc64': 'libc6,64bit',
+                }
+            abi_type = mach_map.get(platform.machine(), 'libc6')
+
+            # XXX assuming GLIBC's ldconfig (with option -p)
+            expr = r'(\S+)\s+\((%s(?:, OS ABI:[^\)]*)?)\)[^/]*(/[^\(\)\s]*lib%s\.[^\(\)\s]*)' \
+                   % (abi_type, re.escape(name))
+            res = re.search(expr,
+                            os.popen('/sbin/ldconfig -p 2>/dev/null').read())
+            if not res:
+                return None
+            return res.group(1)
+
         def find_library(name):
-            return _get_soname(_findLib_ldconfig(name) or _findLib_gcc(name))
+            return _findSoname_ldconfig(name) or _get_soname(_findLib_gcc(name))
 
 ################################################################
 # test code