Moved macros from upb.h to port_def.inc to avoid leaking them to users. (#160)

* Use port_def.inc to prevent macros from leaking to users.

* Added helpful comments to port_def.inc/port_undef.inc.

1 files changed, 2 insertions, 0 deletions

diff --git a/upb/def.c b/upb/def.c
index 6721bcb..b51f22a 100644
--- a/upb/def.c
+++ b/upb/def.c
@@ -7,6 +7,8 @@
 #include <string.h>
 #include "google/protobuf/descriptor.upb.h"
 
+#include "upb/port_def.inc"
+
 typedef struct {
   size_t len;
   char str[1];  /* Null-terminated string data follows. */