add extern "C" guards

include/mruby/data.h

@@ -4,14 +4,13 @@
 ** See Copyright Notice in mruby.h
 */
 
-#ifndef RUBY_DATA_H
-#define RUBY_DATA_H 1
+#ifndef MRUBY_DATA_H
+#define MRUBY_DATA_H 1
 
 #if defined(__cplusplus)
 extern "C" {
 #endif
 
-
 struct mrb_data_type {
   const char *struct_name;
   void (*dfree)(mrb_state *mrb, void*);
@@ -48,4 +47,4 @@ void *mrb_check_datatype(mrb_state *mrb, mrb_value, const struct mrb_data_type*)
 }  /* extern "C" { */
 #endif
 
-#endif /* RUBY_DATA_H */
+#endif /* MRUBY_DATA_H */

src/compile.h

@@ -4,6 +4,13 @@
 ** See Copyright Notice in mruby.h
 */
 
+#ifndef RUBY_COMPILE_H
+#define RUBY_COMPILE_H 1
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
 #include "mruby.h"
 #include <stdio.h>
 #include <setjmp.h>
@@ -93,3 +100,8 @@ int mrb_compile_file(mrb_state*,FILE*);
 int mrb_compile_string(mrb_state*,char*);
 int mrb_compile_nstring(mrb_state*,char*,size_t);
 
+#if defined(__cplusplus)
+}  /* extern "C" { */
+#endif
+
+#endif /* MRUBY_COMPILE_H */

src/gc.h

@@ -7,6 +7,10 @@
 #ifndef MRUBY_GC_H
 #define MRUBY_GC_H
 
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
 typedef struct {
   union {
     struct free_obj {
@@ -41,4 +45,8 @@ void mrb_gc_mark_ht(mrb_state*, struct RHash*);
 size_t mrb_gc_mark_ht_size(mrb_state*, struct RHash*);
 void mrb_gc_free_ht(mrb_state*, struct RHash*);
 
+#if defined(__cplusplus)
+}  /* extern "C" { */
+#endif
+
 #endif  /* MRUBY_GC_H */