From: "Barak A. Pearlmutter" <barak+git@pearlmutter.net>
Date: Thu, 6 May 2021 09:25:27 +0100
Subject: cmake OpenMP

Tell cmake to check if OpenMP is available and if so egage the
appropriate compiler flags.
---
 CMakeLists.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b36aa24..50b7e49 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,6 +8,15 @@ set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 set(CMAKE_AUTOMOC ON)
 
+find_package(OpenMP)
+if(OPENMP_FOUND)
+    add_compile_options(${OpenMP_CXX_FLAGS})
+    if(NOT MSVC)
+        set(CMAKE_EXE_LINKER_FLAGS
+            "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_CXX_FLAGS}")
+    endif()
+endif()
+
 find_package(ECM REQUIRED NO_MODULE)
 set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH})