From 0ee3873ce485fa0903f41aa7a657b4813548f953 Mon Sep 17 00:00:00 2001
From: Ingo Weyrich <heckflosse67@gmx.de>
Date: Mon, 28 Oct 2019 13:35:46 +0100
Subject: [PATCH] fix clang warning

---
 rtengine/guidedfilter.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/rtengine/guidedfilter.cc b/rtengine/guidedfilter.cc
index feb108198..70807424a 100644
--- a/rtengine/guidedfilter.cc
+++ b/rtengine/guidedfilter.cc
@@ -66,7 +66,12 @@ void guidedFilter(const array2D<float> &guide, const array2D<float> &src, array2
     enum Op {MUL, DIVEPSILON, SUBMUL};
 
     const auto apply =
+#ifdef _OPENMP
         [multithread, epsilon](Op op, array2D<float> &res, const array2D<float> &a, const array2D<float> &b, const array2D<float> &c=array2D<float>()) -> void
+#else
+        // removed multithread to fix clang warning on msys2 clang builds, which don't support OpenMp
+        [epsilon](Op op, array2D<float> &res, const array2D<float> &a, const array2D<float> &b, const array2D<float> &c=array2D<float>()) -> void
+#endif
         {
             const int w = res.width();
             const int h = res.height();