cmake: Check if we have Thread Local Storage support.

ConfigureChecks.cmake

@@ -165,6 +165,20 @@ if (CMAKE_HAVE_THREADS_LIBRARY)
 endif (CMAKE_HAVE_THREADS_LIBRARY)
 
 # OPTIONS
+check_c_source_compiles("
+__thread int tls;
+
+int main(void) {
+    return 0;
+}" HAVE_GCC_THREAD_LOCAL_STORAGE)
+
+check_c_source_compiles("
+__declspec(thread) int tls;
+
+int main(void) {
+    return 0;
+}" HAVE_MSC_THREAD_LOCAL_STORAGE)
+
 if (WITH_DEBUG_CRYPTO)
   set(DEBUG_CRYPTO 1)
 endif (WITH_DEBUG_CRYPTO)

config.h.cmake

@@ -120,6 +120,9 @@
 
 /**************************** OPTIONS ****************************/
 
+#cmakedefine HAVE_GCC_THREAD_LOCAL_STORAGE 1
+#cmakedefine HAVE_MSC_THREAD_LOCAL_STORAGE 1
+
 /* Define to 1 if you want to enable GSSAPI */
 #cmakedefine WITH_GSSAPI 1
 

include/libssh/priv.h

@@ -130,6 +130,14 @@ int gettimeofday(struct timeval *__p, void *__t);
 #endif
 #endif
 
+#if defined(HAVE_GCC_THREAD_LOCAL_STORAGE)
+# define LIBSSH_THREAD __thread
+#elif defined(HAVE_MSC_THREAD_LOCAL_STORAGE)
+# define LIBSSH_THREAD __declspec(thread)
+#else
+# define LIBSSH_THREAD
+#endif
+
 #define enter_function() (void)session
 #define leave_function() (void)session