From b5724a654a4aadeabcfa3de3847768239931c687 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C5=99emysl=20Janouch?= <p.janouch@gmail.com>
Date: Fri, 1 Jan 2016 19:15:18 +0100
Subject: [PATCH] Compile tests with pthreads support

---
 CMakeLists.txt         |  7 +++++--
 cmake/AddThreads.cmake | 23 +++++++++++++++++++++++
 2 files changed, 28 insertions(+), 2 deletions(-)
 create mode 100644 cmake/AddThreads.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 12843d8..f430c2e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,9 +11,11 @@ endif ("${CMAKE_C_COMPILER_ID}" MATCHES "GNU" OR CMAKE_COMPILER_IS_GNUC)
 find_package (PkgConfig REQUIRED)
 pkg_check_modules (libssl REQUIRED libssl libcrypto)
 
-# -lpthread is only there for debugging (gdb & errno)
+set (CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
+include (AddThreads)
+
 # -lrt is only for glibc < 2.17
-set (common_libraries ${libssl_LIBRARIES} rt pthread)
+set (common_libraries ${libssl_LIBRARIES} rt)
 include_directories (${libssl_INCLUDE_DIRS})
 link_directories (${libssl_LIBRARY_DIRS})
 
@@ -29,6 +31,7 @@ set (common_sources ${PROJECT_BINARY_DIR}/liberty-config.h)
 enable_testing ()
 foreach (name liberty proto)
 	add_executable (test-${name} tests/${name}.c ${common_sources})
+	add_threads (test-${name})
 	target_link_libraries (test-${name} ${common_libraries})
 	add_test (NAME test-${name} COMMAND test-${name})
 endforeach (name)
diff --git a/cmake/AddThreads.cmake b/cmake/AddThreads.cmake
new file mode 100644
index 0000000..72a4e08
--- /dev/null
+++ b/cmake/AddThreads.cmake
@@ -0,0 +1,23 @@
+# Public Domain
+
+# We're looking for pthreads only, while preferring the -pthread flag
+set (CMAKE_THREAD_PREFER_PTHREAD ON)
+set (THREADS_PREFER_PTHREAD_FLAG ON)
+find_package (Threads)
+
+# Prepares the given target for threads
+function (add_threads target)
+	if (NOT Threads_FOUND OR NOT CMAKE_USE_PTHREADS_INIT)
+		message (FATAL_ERROR "pthreads not found")
+	endif (NOT Threads_FOUND OR NOT CMAKE_USE_PTHREADS_INIT)
+
+	if (THREADS_HAVE_PTHREAD_ARG)
+		set_property (TARGET ${target} PROPERTY
+			COMPILE_OPTIONS "-pthread")
+		set_property (TARGET ${target} PROPERTY
+			INTERFACE_COMPILE_OPTIONS "-pthread")
+	endif (THREADS_HAVE_PTHREAD_ARG)
+	if (CMAKE_THREAD_LIBS_INIT)
+		target_link_libraries (${target} "${CMAKE_THREAD_LIBS_INIT}")
+	endif (CMAKE_THREAD_LIBS_INIT)
+endfunction (add_threads)