From 8961c4b68bdf3202be0451a68418922cf869439c Mon Sep 17 00:00:00 2001
From: Matthew Woehlke <matthew.woehlke@kitware.com>
Date: Wed, 8 May 2013 16:04:30 -0400
Subject: FindProtobuf: also find pthread

Modify FindProtobuf.cmake to find the pthread library on UNIX platforms,
and to add the same to PROTOBUF_LIBRARIES, as this is a link dependency
of libraries using the protobuf headers.
---
 Modules/FindProtobuf.cmake | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Modules/FindProtobuf.cmake b/Modules/FindProtobuf.cmake
index af0c2dd..2972198 100644
--- a/Modules/FindProtobuf.cmake
+++ b/Modules/FindProtobuf.cmake
@@ -156,6 +156,16 @@ function(_protobuf_find_libraries name filename)
    endif()
 endfunction()
 
+# Internal function: find threads library
+function(_protobuf_find_threads)
+    set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
+    find_package(Threads)
+    if(Threads_FOUND)
+        list(APPEND PROTOBUF_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
+        set(PROTOBUF_LIBRARIES "${PROTOBUF_LIBRARIES}" PARENT_SCOPE)
+    endif()
+endfunction()
+
 #
 # Main.
 #
@@ -190,6 +200,9 @@ if(MSVC)
     set(CMAKE_FIND_LIBRARY_PREFIXES "${PROTOBUF_ORIG_FIND_LIBRARY_PREFIXES}")
 endif()
 
+if(UNIX)
+    _protobuf_find_threads()
+endif()
 
 # Find the include directory
 find_path(PROTOBUF_INCLUDE_DIR
-- 
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