From 38d73123c1fbca8e81748e2ed9bd1d71ec4e92fb Mon Sep 17 00:00:00 2001
From: Andrei Costinescu <AndreiCostinescu@users.noreply.github.com>
Date: Sun, 25 Mar 2018 20:39:29 +0200
Subject: [PATCH] #include <math.h> in cv2.cpp

My build fails with the error:
"C:/PROGRA~1/MINGW-~1/X86_64~1.0-P/mingw64/lib/gcc/x86_64-w64-mingw32/7.2.0/include/c++/cmath:1136:11: error: '::hypot' has not been declared".
I have tried to fix it by adding "#include <cmath>" before the line "#include <Python.h>" but then the build has failed with the error:
"C:/PROGRA~1/MINGW-~1/X86_64~1.0-P/mingw64/lib/gcc/x86_64-w64-mingw32/7.2.0/include/c++/math.h:91:12:: error: 'std::_hypot' has not been declared".
Adding "#include <math.h>" allowed me to build opencv.
---
 modules/python/src2/cv2.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/python/src2/cv2.cpp b/modules/python/src2/cv2.cpp
index fab60fd03f..8ed6478bcc 100644
--- a/modules/python/src2/cv2.cpp
+++ b/modules/python/src2/cv2.cpp
@@ -4,6 +4,7 @@
 #pragma warning(push)
 #pragma warning(disable:5033)  // 'register' is no longer a supported storage class
 #endif
+#include <math.h>
 #include <Python.h>
 #if defined(_MSC_VER) && (_MSC_VER >= 1800)
 #pragma warning(pop)