From c9bfe786331647237b90f5f9e35b4d2cad7aaa69 Mon Sep 17 00:00:00 2001
From: Roger Leigh <rleigh@apache.org>
Date: Fri, 12 Oct 2018 12:02:58 +0000
Subject: [PATCH] cmake: Allow thread checks to fail and fall back to nothreads

Closes: #2155


git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@1843653 13f79535-47bb-0310-9956-ffa450edef68
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Retrieved from: https://github.com/apache/xerces-c/commit/c9bfe786331647237b90f5f9e35b4d2cad7aaa69]
---
 cmake/XercesMutexMgrSelection.cmake | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/cmake/XercesMutexMgrSelection.cmake b/cmake/XercesMutexMgrSelection.cmake
index 2f1d71c50..ad698840d 100644
--- a/cmake/XercesMutexMgrSelection.cmake
+++ b/cmake/XercesMutexMgrSelection.cmake
@@ -19,11 +19,15 @@
 
 # mutexmgr selection
 
-option(threads "Threading support" ON)
+set(xerces_thread_default ON)
+find_package(Threads)
+if(NOT TARGET Threads::Threads)
+  set(xerces_thread_default ON)
+endif()
 
-include(CheckCXXSourceCompiles)
+option(threads "Threading support" ${xerces_thread_default})
 
-find_package(Threads REQUIRED)
+include(CheckCXXSourceCompiles)
 
 function(thread_test outvar)
   set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})