From b6c0e65dee3cafbc520055c18c5047b21ef01fc4 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Sat, 3 Mar 2018 13:14:09 +1100
Subject: [PATCH] waf: set CYGWIN_BUILD on cygwin for px4

helps with missing/cmath
---
 Tools/ardupilotwaf/boards.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Tools/ardupilotwaf/boards.py b/Tools/ardupilotwaf/boards.py
index 3335337c6f..fa9c0eb5b8 100644
--- a/Tools/ardupilotwaf/boards.py
+++ b/Tools/ardupilotwaf/boards.py
@@ -698,6 +698,9 @@ class px4(Board):
             'uavcan',
         ]
 
+        if sys.platform == 'cygwin':
+            env.CXXFLAGS += ['-DCYGWIN_BUILD']
+
         env.ROMFS_EXCLUDE = self.ROMFS_EXCLUDE
 
         env.PX4_BOOTLOADER_NAME = self.bootloader_name