+check_cxx_source_compiles ("
+__declspec(thread) int tls;
+int main() { }
+" HAVE_MSVC_TLS)
+
+check_cxx_source_compiles ("
+thread_local int tls;
+int main() { }
+" HAVE_CXX11_TLS)
+
+check_cxx_source_compiles ("
+__attribute__((thread)) int tls;
+int main() { }
+" HAVE_CYGWIN_TLS)
+
+if (WITH_TLS)
+ if (HAVE_CYGWIN_TLS)
+ set (GLOG_THREAD_LOCAL_STORAGE "__attribute__((thread))")
+ elseif (HAVE_MSVC_TLS)
+ set (GLOG_THREAD_LOCAL_STORAGE "__declspec(thread)")
+ elseif (HAVE_CXX11_TLS)
+ set (GLOG_THREAD_LOCAL_STORAGE thread_local)
+ endif (HAVE_CYGWIN_TLS)
+endif (WITH_TLS)
+