Use "static inline" instead of "extern inline" for now.

Makefile

@@ -4,7 +4,7 @@ CC=gcc
 CXX=g++
 CFLAGS=-std=c99
 CPPFLAGS=-O3 -Wall -Wextra -pedantic -g -DNDEBUG -DUPB_UNALIGNED_READS_OK -fomit-frame-pointer
-OBJ=upb_parse.o upb_table.o upb_msg.o upb_context.o descriptor.o upb_inlinedefs.o
+OBJ=upb_parse.o upb_table.o upb_msg.o upb_context.o descriptor.o
 all: $(OBJ) test_table tests
 clean:
 	rm -f $(OBJ) tests

upb.h

@@ -16,15 +16,8 @@
 extern "C" {
 #endif
 
-/* Portable inlining strategy: use C99 rules except on GCC.
+/* inline if possible, emit standalone code if required. */
- *   see: http://www.greenend.org.uk/rjk/2003/03/inline.html. */
+#define INLINE static inline
-#ifndef INLINE
-# if __GNUC__ && !__GNUC_STDC_INLINE__
-#  define INLINE extern inline
-# else
-#  define INLINE inline
-# endif
-#endif
 
 /* The maximum that any submessages can be nested.  Matches proto2's limit. */
 #define UPB_MAX_NESTING 64

upb_msg.h

@@ -96,7 +96,7 @@ struct upb_fieldsbyname_entry {
   struct upb_abbrev_msg_field f;
 };
 
-struct upb_msg_field *upb_get_msg_field(
+INLINE struct upb_msg_field *upb_get_msg_field(
     struct upb_abbrev_msg_field *f, struct upb_msg *m) {
   return &m->fields[f->field_index];
 }