From 2d3149157f03a458c253e398148798afb0899944 Mon Sep 17 00:00:00 2001
From: Michael Friedrich <michael.friedrich@icinga.com>
Date: Wed, 27 Sep 2017 20:04:43 +0200
Subject: [PATCH] Fix clang compiler detection on Fedora and macOS

fixes #5257
---
 CMakeLists.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0ee769503..52c698bb0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -148,6 +148,13 @@ set(CMAKE_MACOSX_RPATH 1)
 if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Qunused-arguments -g")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Qunused-arguments -g")
+
+  # Clang on Fedora requires -pthread, Apple Clang does not
+  # AppleClang is available since CMake 3.0.0
+  if (NOT CMAKE_CXX_COMPILER_ID MATCHES "AppleClang")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pthread")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
+  endif()
 endif()
 
 if(CMAKE_C_COMPILER_ID STREQUAL "SunPro")