# HG changeset patch
# User Augie Fackler <augie@google.com>
# Date 1585151807 14400
# Node ID 960770add699b3aa88ca6f8aa1b8691f0fc14f66
# Parent  a89aa2d7b34d381d791b77756d8f17e05ead2ddb
setup: relax -Werror for declaration-after-statement on Python 3.9

It turns out Python 3.9 introduces such declarations in the headers, eg

cpython/abstract.h:189:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]

so we have to be more relaxed when compiling for 3.9.

Differential Revision: https://phab.mercurial-scm.org/D8327

diff -r a89aa2d7b34d -r 960770add699 setup.py
--- a/setup.py	Wed Mar 25 08:28:20 2020 -0700
+++ b/setup.py	Wed Mar 25 11:56:47 2020 -0400
@@ -1270,8 +1270,9 @@
 
 common_cflags = []
 
-# MSVC 2008 still needs declarations at the top of the scope.
-if os.name != 'nt':
+# MSVC 2008 still needs declarations at the top of the scope, but Python 3.9
+# makes declarations not at the top of a scope in the headers.
+if os.name != 'nt' and sys.version_info[1] < 9:
     common_cflags = ['-Werror=declaration-after-statement']
 
 osutil_cflags = []