From b1793da30ec015501677ca4c5da5291dfbb22349 Mon Sep 17 00:00:00 2001
From: Justin Mills <vortexjj@gmail.com>
Date: Tue, 17 Oct 2017 00:02:13 -0400
Subject: [PATCH] Only set OpenMP_CXX_FLAGS when OpenMP is found (#2613)

* Only set OpenMP_CXX_FLAGS when OpenMP is found

I found this trying to get the Mac build working without OpenMP. Tips in
issue #2596 helped to point in the right direction.

* Revise check

* Trigger codecov
---
 CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b7b9d665d..ab9f634f7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,7 +24,9 @@ endif()
 # Compiler flags
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
+if(OpenMP_CXX_FOUND OR OPENMP_FOUND)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
+endif()
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 if(MSVC)
   # Multithreaded compilation