Format sym_extract.py output to minimize diff output.

Different versions of python print dictionaries in different orders.
 This can mess up diffs when updating ABI lists. This patch uses
 pprint.pformat to print the dicts to get a consistent ordering.

llvm-svn: 353634

libcxx/utils/libcxx/sym_check/util.py

@@ -11,6 +11,7 @@ import distutils.spawn
 import sys
 import re
 import libcxx.util
+from pprint import pformat
 
 
 def read_syms_from_list(slist):
@@ -48,7 +49,8 @@ def write_syms(sym_list, out=None, names_only=False):
     if names_only:
         out_list = [sym['name'] for sym in sym_list]
     for sym in out_list:
-        out_str += '%s\n' % sym
+        # Use pformat for consistent ordering of keys.
+        out_str += pformat(sym, width=100000) + '\n'
     if out is None:
         sys.stdout.write(out_str)
     else: