Integer unification macro

* include/ruby/ruby.h (RUBY_INTEGER_UNIFICATION): macro to tell if
  Integer is integrated.  [ruby-core:75718][Bug #12427]
* include/ruby/backward.h, internal.h (rb_cFixnum, rb_cBignum):
  fallback to rb_cInteger.
* bignum.c, numeric.c, ext/json/generator/generator.{c,h}: use the
  macro.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55394 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/numeric.c b/numeric.c
index 6c8afe2ec0..aa16303495 100644
--- a/numeric.c
+++ b/numeric.c
@@ -111,7 +111,9 @@ static ID id_coerce, id_div, id_divmod;
 VALUE rb_cNumeric;
 VALUE rb_cFloat;
 VALUE rb_cInteger;
+#ifndef RUBY_INTEGER_UNIFICATION
 VALUE rb_cFixnum;
+#endif
 
 VALUE rb_eZeroDivError;
 VALUE rb_eFloatDomainError;
@@ -4957,7 +4959,9 @@ Init_Numeric(void)
     rb_define_method(rb_cInteger, "size", int_size, 0);
     rb_define_method(rb_cInteger, "bit_length", rb_int_bit_length, 0);
 
+#ifndef RUBY_INTEGER_UNIFICATION
     rb_cFixnum = rb_cInteger;
+#endif
     rb_define_const(rb_cObject, "Fixnum", rb_cInteger);
 
     rb_cFloat  = rb_define_class("Float", rb_cNumeric);