Merge pull request libgit2#4135 from libgit2/ethomson/ancient_gcc_not_threadsafe

Provide error on gcc < 4.1 when THREADSAFE

Author: carlosmn

src/thread-utils.h

@@ -7,6 +7,12 @@
 #ifndef INCLUDE_thread_utils_h__
 #define INCLUDE_thread_utils_h__
 
+#if defined(__GNUC__) && defined(GIT_THREADS)
+# if (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 1))
+#  error Atomic primitives do not exist on this version of gcc; configure libgit2 with -DTHREADSAFE=OFF
+# endif
+#endif
+
 /* Common operations even if threading has been disabled */
 typedef struct {
 #if defined(GIT_WIN32)