Fixes for compiling mruby as C++

include/mruby.h

@@ -28,10 +28,26 @@
 #ifndef MRUBY_H
 #define MRUBY_H
 
+#ifdef __cplusplus
+#define __STDC_LIMIT_MACROS
+#define __STDC_CONSTANT_MACROS
+#define __STDC_FORMAT_MACROS
+#endif
+
 #include <stdint.h>
 #include <stddef.h>
 #include <limits.h>
 
+#ifdef __cplusplus
+#ifndef SIZE_MAX
+#ifdef __SIZE_MAX__
+#define SIZE_MAX __SIZE_MAX__
+#else
+#define SIZE_MAX std::numeric_limits<size_t>::max()
+#endif
+#endif
+#endif
+
 #ifdef MRB_DEBUG
 #include <assert.h>
 #define mrb_assert(p) assert(p)

include/mruby/boxing_nan.h

@@ -53,7 +53,7 @@ typedef struct mrb_value {
 #define mrb_float_pool(mrb,f) mrb_float_value(mrb,f)
 
 #define mrb_tt(o)       ((enum mrb_vtype)(((o).value.ttt & 0xfc000)>>14)-1)
-#define mrb_type(o)     ((uint32_t)0xfff00000 < (o).value.ttt ? mrb_tt(o) : MRB_TT_FLOAT)
+#define mrb_type(o)     (enum mrb_vtype)((uint32_t)0xfff00000 < (o).value.ttt ? mrb_tt(o) : MRB_TT_FLOAT)
 #define mrb_ptr(o)      ((void*)((((uintptr_t)0x3fffffffffff)&((uintptr_t)((o).value.p)))<<2))
 #define mrb_float(o)    (o).f
 #define mrb_cptr(o)     mrb_ptr(o)

mrbgems/mruby-inline-struct/test/inline.c

@@ -6,7 +6,7 @@
 static mrb_value
 istruct_test_initialize(mrb_state *mrb, mrb_value self)
 {
-  char *string = mrb_istruct_ptr(self);
+  char *string = (char*)mrb_istruct_ptr(self);
   mrb_int size = mrb_istruct_size();
   mrb_value object;
   mrb_get_args(mrb, "o", &object);
@@ -31,7 +31,7 @@ istruct_test_initialize(mrb_state *mrb, mrb_value self)
 static mrb_value
 istruct_test_to_s(mrb_state *mrb, mrb_value self)
 {
-  return mrb_str_new_cstr(mrb, mrb_istruct_ptr(self));
+  return mrb_str_new_cstr(mrb, (const char*)mrb_istruct_ptr(self));
 }
 
 static mrb_value
@@ -63,7 +63,7 @@ istruct_test_test_receive_direct(mrb_state *mrb, mrb_value self)
 static mrb_value
 istruct_test_mutate(mrb_state *mrb, mrb_value self)
 {
-  char *ptr = mrb_istruct_ptr(self);
+  char *ptr = (char*)mrb_istruct_ptr(self);
   memcpy(ptr, "mutate", 6);
   return mrb_nil_value();
 }

mrbgems/mruby-objectspace/src/mruby_objectspace.c

@@ -49,7 +49,7 @@ static mrb_value
 os_count_objects(mrb_state *mrb, mrb_value self)
 {
   struct os_count_struct obj_count = { 0 };
-  enum mrb_vtype i;
+  mrb_int i;
   mrb_value hash;
 
   if (mrb_get_args(mrb, "|H", &hash) == 0) {

mrbgems/mruby-sprintf/src/sprintf.c

@@ -844,13 +844,13 @@ retry:
             strncpy(nbuf, RSTRING_PTR(val), sizeof(nbuf));
             break;
           case 8:
-            snprintf(nbuf, sizeof(nbuf), "%"MRB_PRIo, v);
+            snprintf(nbuf, sizeof(nbuf), "%" MRB_PRIo, v);
             break;
           case 10:
-            snprintf(nbuf, sizeof(nbuf), "%"MRB_PRId, v);
+            snprintf(nbuf, sizeof(nbuf), "%" MRB_PRId, v);
             break;
           case 16:
-            snprintf(nbuf, sizeof(nbuf), "%"MRB_PRIx, v);
+            snprintf(nbuf, sizeof(nbuf), "%" MRB_PRIx, v);
             break;
           }
           s = nbuf;
@@ -865,13 +865,13 @@ retry:
             strncpy(++s, RSTRING_PTR(val), sizeof(nbuf)-1);
             break;
           case 8:
-            snprintf(++s, sizeof(nbuf)-1, "%"MRB_PRIo, v);
+            snprintf(++s, sizeof(nbuf)-1, "%" MRB_PRIo, v);
             break;
           case 10:
-            snprintf(++s, sizeof(nbuf)-1, "%"MRB_PRId, v);
+            snprintf(++s, sizeof(nbuf)-1, "%" MRB_PRId, v);
             break;
           case 16:
-            snprintf(++s, sizeof(nbuf)-1, "%"MRB_PRIx, v);
+            snprintf(++s, sizeof(nbuf)-1, "%" MRB_PRIx, v);
             break;
           }
           if (v < 0) {

src/backtrace.c

@@ -160,7 +160,7 @@ static void
 output_backtrace_i(mrb_state *mrb, struct backtrace_location_raw *loc_raw, void *data)
 {
   struct backtrace_location loc;
-  struct output_backtrace_args *args = data;
+  struct output_backtrace_args *args = (struct output_backtrace_args *)data;
 
   loc.i          = loc_raw->i;
   loc.lineno     = loc_raw->lineno;
@@ -338,7 +338,7 @@ save_backtrace_i(mrb_state *mrb,
     else {
       new_n_allocated = mrb->backtrace.n_allocated * 2;
     }
-    mrb->backtrace.entries =
+    mrb->backtrace.entries = (mrb_backtrace_entry *)
       mrb_realloc(mrb,
                   mrb->backtrace.entries,
                   sizeof(mrb_backtrace_entry) * new_n_allocated);

src/string.c

@@ -361,7 +361,7 @@ mrb_memsearch(const void *x0, mrb_int m, const void *y0, mrb_int n)
     return 0;
   }
   else if (m == 1) {
-    const unsigned char *ys = memchr(y, *x, n);
+    const unsigned char *ys = (const unsigned char *)memchr(y, *x, n);
 
     if (ys)
       return ys - y;