From 94eee5e683b80e0ffd8e0c4fd3a45b03f0f37b18 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 22 Feb 2018 12:57:29 -0500
Subject: CMakeLib: Link to system thread libraries to support std::thread

Some environments require linking to thread libraries for `std::thread`.
Express this direct dependency of CMakeLib explicitly.  Previously this
was done indirectly through our bundled libuv, but that does not work
when using a system libuv.

Fixes: #17757
---
 CMakeLists.txt | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'CMakeLists.txt')

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e4d2a9a0a2..66239595ef 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -310,6 +310,8 @@ endmacro()
 # Simply to improve readability of the main script.
 #-----------------------------------------------------------------------
 macro (CMAKE_BUILD_UTILITIES)
+  find_package(Threads)
+
   #---------------------------------------------------------------------
   # Create the kwsys library for CMake.
   set(KWSYS_NAMESPACE cmsys)
-- 
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