commit d8ad965089cb478f732ce13dfc8b7ebbc59024bb
author Vitaly Buka <vitalybuka@google.com> Fri May 12 22:00:56 2017 -0700
committer Vitaly Buka <vitalybuka@gmail.com> Fri May 12 22:13:28 2017 -0700
tree c7b056bbc2530176dc4df57f7ae93b3919923121
parent 84aa25e9afba6e0bbb33f87ecea6afc66976299f

Link protobuf with pthread.
Building with --stdlib=libc++ may need this pthread.

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ec9510c..31733bf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,6 +29,7 @@
 include(CheckCCompilerFlag)
 include(CheckCXXCompilerFlag)
 
+set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads)
 
 find_package(LibLZMA)
@@ -95,6 +96,10 @@
 
 set(PROTOBUF_CFLAGS "${CMAKE_C_FLAGS} ${NO_FUZZING_FLAGS} -w")
 set(PROTOBUF_CXXFLAGS "${CMAKE_CXX_FLAGS} ${NO_FUZZING_FLAGS} -w")
+if(THREADS_HAVE_PTHREAD_ARG)
+  set(PROTOBUF_CFLAGS "${PROTOBUF_CFLAGS} -pthread")
+  set(PROTOBUF_CXXFLAGS "${PROTOBUF_CXXFLAGS} -pthread")
+endif()
 include(protobuf)
 
 enable_testing()