From cb5487d9015703c19c78400b8dc297e168a1ff3d Mon Sep 17 00:00:00 2001
From: Sergiu Dotenco <sergiu.dotenco@gmail.com>
Date: Sat, 8 Aug 2015 19:07:07 +0200
Subject: [PATCH] cmake: allow to disable multithreading support

This commit additionally enables threading for win32 by default.
---
 CMakeLists.txt        | 21 +++++++++++----------
 src/config.h.cmake.in |  3 +++
 2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a1978c4..1e6ce8d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,6 +23,7 @@ set (CPACK_PACKAGE_VERSION_PATCH ${GLOG_PATCH_VERSION})
 set (CPACK_PACKAGE_VERSION ${GLOG_VERSION})
 
 option (WITH_GFLAGS "Use gflags" ON)
+option (WITH_THREADS "Enable multithreading support" ON)
 
 list (APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 
@@ -51,7 +52,9 @@ if (WITH_GFLAGS)
   endif (gflags_FOUND)
 endif (WITH_GFLAGS)
 
-find_package (Threads)
+if (WITH_THREADS)
+  find_package (Threads)
+endif (WITH_THREADS)
 
 check_include_file (dlfcn.h HAVE_DLFCN_H)
 check_include_file (execinfo.h HAVE_EXECINFO_H)
@@ -306,9 +309,13 @@ endif (HAVE_USING_OPERATOR)
 
 set (SIZEOF_VOID_P ${CMAKE_SIZEOF_VOID_P})
 
-if (Threads_FOUND AND CMAKE_USE_PTHREADS_INIT)
-  set (HAVE_PTHREAD 1)
-endif (Threads_FOUND AND CMAKE_USE_PTHREADS_INIT)
+if (WITH_THREADS AND Threads_FOUND)
+  if (CMAKE_USE_PTHREADS_INIT)
+    set (HAVE_PTHREAD 1)
+  endif (CMAKE_USE_PTHREADS_INIT)
+else (WITH_THREADS AND Threads_FOUND)
+  set (NO_THREADS 1)
+endif (WITH_THREADS AND Threads_FOUND)
 
 set (TEST_SRC_DIR \"${CMAKE_CURRENT_SOURCE_DIR}\")
 
@@ -428,12 +435,6 @@ else (NOT BUILD_SHARED_LIBS)
     "GOOGLE_GLOG_DLL_DECL_FOR_UNITTESTS=${_IMPORT}")
 endif (NOT BUILD_SHARED_LIBS)
 
-if (HAVE_PTHREAD)
-  target_link_libraries (glog PUBLIC ${CMAKE_THREAD_LIBS_INIT})
-else (HAVE_PTHREAD)
-  target_compile_definitions (glog PUBLIC NO_THREADS)
-endif (HAVE_PTHREAD)
-
 if (HAVE_EXECINFO_H)
   set (HAVE_STACKTRACE 1)
 endif (HAVE_EXECINFO_H)
diff --git a/src/config.h.cmake.in b/src/config.h.cmake.in
index 0094a09..6635df1 100644
--- a/src/config.h.cmake.in
+++ b/src/config.h.cmake.in
@@ -46,6 +46,9 @@
 /* Define to 1 if you have the <memory.h> header file. */
 #cmakedefine HAVE_MEMORY_H
 
+/* define to disable multithreading support. */
+#cmakedefine NO_THREADS
+
 /* define if the compiler implements namespaces */
 #cmakedefine HAVE_NAMESPACES
 
-- 
2.34.1