1 files changed, 10 insertions, 3 deletions
diff --git a/thread.c b/thread.c
index 05d129de2a..c7a334ff0f 100644
--- a/thread.c
+++ b/thread.c
@@ -2356,6 +2356,11 @@ do_select(int n, fd_set *read, fd_set *write, fd_set *except,
 {
     int result, lerrno;
     fd_set orig_read, orig_write, orig_except;
+#if defined __GNUC__ && defined __x86_64__
+#define FAKE_FD_ZERO(f) (*(int *)&(f)=0) /* suppress lots of warnings */
+#else
+#define FAKE_FD_ZERO(f) ((void)0)
+#endif
 
 #ifndef linux
     double limit = 0;
@@ -2377,9 +2382,11 @@ do_select(int n, fd_set *read, fd_set *write, fd_set *except,
     }
 #endif
 
-    if (read) orig_read = *read;
-    if (write) orig_write = *write;
-    if (except) orig_except = *except;
+    if (read) orig_read = *read; else FAKE_FD_ZERO(orig_read);
+    if (write) orig_write = *write; else FAKE_FD_ZERO(orig_write);
+    if (except) orig_except = *except; else FAKE_FD_ZERO(orig_except);
+
+#undef FAKE_FD_ZERO
 
   retry:
     lerrno = 0;