Respect NDEBUG for asserts even though Ruby 3+ pollutes it.

Prior to this CL, asserts have no effect for Ruby 3+, because Ruby unconditionally defines `NDEBUG`: https://bugs.ruby-lang.org/issues/18777

We work around this by doing `#undef NDEBUG` right after including Ruby, if `NDEBUG` was not previously defined.

PiperOrigin-RevId: 535359088

ruby/ext/google/protobuf_c/convert.h

@@ -31,8 +31,6 @@
 #ifndef RUBY_PROTOBUF_CONVERT_H_
 #define RUBY_PROTOBUF_CONVERT_H_
 
-#include <ruby/ruby.h>
-
 #include "protobuf.h"
 #include "ruby-upb.h"
 

ruby/ext/google/protobuf_c/defs.h

@@ -31,8 +31,6 @@
 #ifndef RUBY_PROTOBUF_DEFS_H_
 #define RUBY_PROTOBUF_DEFS_H_
 
-#include <ruby/ruby.h>
-
 #include "protobuf.h"
 #include "ruby-upb.h"
 

ruby/ext/google/protobuf_c/map.h

@@ -31,8 +31,6 @@
 #ifndef RUBY_PROTOBUF_MAP_H_
 #define RUBY_PROTOBUF_MAP_H_
 
-#include <ruby/ruby.h>
-
 #include "protobuf.h"
 #include "ruby-upb.h"
 

ruby/ext/google/protobuf_c/message.h

@@ -31,8 +31,6 @@
 #ifndef RUBY_PROTOBUF_MESSAGE_H_
 #define RUBY_PROTOBUF_MESSAGE_H_
 
-#include <ruby/ruby.h>
-
 #include "protobuf.h"
 #include "ruby-upb.h"
 

ruby/ext/google/protobuf_c/protobuf.h

@@ -31,8 +31,16 @@
 #ifndef __GOOGLE_PROTOBUF_RUBY_PROTOBUF_H__
 #define __GOOGLE_PROTOBUF_RUBY_PROTOBUF_H__
 
+// Ruby 3+ defines NDEBUG itself, see: https://bugs.ruby-lang.org/issues/18777
+#ifdef NDEBUG
+#include <ruby.h>
+#else
+#include <ruby.h>
+#undef NDEBUG
+#endif
+
+#include <assert.h>  // Must be included after the NDEBUG logic above.
 #include <ruby/encoding.h>
-#include <ruby/ruby.h>
 #include <ruby/vm.h>
 
 #include "defs.h"
@@ -110,7 +118,9 @@ extern VALUE cTypeError;
   do {                      \
   } while (false && (expr))
 #else
-#define PBRUBY_ASSERT(expr) assert(expr)
+#define PBRUBY_ASSERT(expr) \
+  if (!(expr))              \
+  rb_bug("Assertion failed at %s:%d, expr: %s", __FILE__, __LINE__, #expr)
 #endif
 
 #define PBRUBY_MAX(x, y) (((x) > (y)) ? (x) : (y))

ruby/ext/google/protobuf_c/repeated_field.c

@@ -100,6 +100,8 @@ VALUE RepeatedField_GetRubyWrapper(upb_Array* array, TypeInfo type_info,
   PBRUBY_ASSERT(ruby_to_RepeatedField(val)->type_info.type == type_info.type);
   PBRUBY_ASSERT(ruby_to_RepeatedField(val)->type_info.def.msgdef ==
                 type_info.def.msgdef);
+  PBRUBY_ASSERT(ruby_to_RepeatedField(val)->array == array);
+
   return val;
 }
 

ruby/ext/google/protobuf_c/repeated_field.h

@@ -31,8 +31,6 @@
 #ifndef RUBY_PROTOBUF_REPEATED_FIELD_H_
 #define RUBY_PROTOBUF_REPEATED_FIELD_H_
 
-#include <ruby/ruby.h>
-
 #include "protobuf.h"
 #include "ruby-upb.h"