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/bignum.c b/bignum.c
index d1e10b95c3..767659d046 100644
--- a/bignum.c
+++ b/bignum.c
@@ -31,7 +31,9 @@
 
 #define RB_BIGNUM_TYPE_P(x) RB_TYPE_P((x), T_BIGNUM)
 
+#ifndef RUBY_INTEGER_UNIFICATION
 VALUE rb_cBignum;
+#endif
 const char ruby_digitmap[] = "0123456789abcdefghijklmnopqrstuvwxyz";
 
 #ifndef SIZEOF_BDIGIT_DBL
@@ -6783,7 +6785,9 @@ rb_big_even_p(VALUE num)
 void
 Init_Bignum(void)
 {
+#ifndef RUBY_INTEGER_UNIFICATION
     rb_cBignum = rb_cInteger;
+#endif
     rb_define_const(rb_cObject, "Bignum", rb_cInteger);
 
     rb_define_method(rb_cInteger, "coerce", rb_int_coerce, 1);