From c472533f021f591f6d93e6cd24285472a00a0974 Mon Sep 17 00:00:00 2001
From: Bernard Xiong <bernard.xiong@gmail.com>
Date: Tue, 16 Jan 2018 20:21:40 +0800
Subject: [PATCH] [Tools] Add _REENT_SMALL definition when enable nano-newlib

---
 tools/building.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/building.py b/tools/building.py
index 6660ed8187..2a2f086b67 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -140,6 +140,10 @@ def PrepareBuilding(env, root_directory, has_libcpu=False, remove_components = [
         env['LIBLINKSUFFIX']   = '.lib'
         env['LIBDIRPREFIX'] = '--userlibpath '
 
+    if rtconfig.PLATFORM == 'gcc':
+        if env['LINKFLAGS'].find('nano.specs'):
+            env.AppendUnique(CPPDEFINES = ['_REENT_SMALL'])
+
     # patch for win32 spawn
     if env['PLATFORM'] == 'win32':
         win32_spawn = Win32Spawn()