* README.EXT, README.EXT.ja: added macros for the Compatibilities.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22565 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 25 insertions, 0 deletions

diff --git a/README.EXT b/README.EXT
index 20aeaa616f..17467477ce 100644
--- a/README.EXT
+++ b/README.EXT
@@ -1252,6 +1252,31 @@ The definition of rb_event_hook_func_t is below:
 
 Removes the specified hook function.
 
+** Macros for the Compatibilities
+
+Some macros to check API compatibilities are available by default.
+
+ NORETURN_STYLE_NEW
+
+Means that NORETURN macro is functional style instead of prefix.
+
+ HAVE_RB_DEFINE_ALLOC_FUNC
+
+Means that function rb_define_alloc_func() is provided, that means the
+allocation framework is used.  This is same as the result of
+have_func("rb_define_alloc_func", "ruby.h").
+
+ HAVE_RB_REG_NEW_STR
+
+Means that function rb_reg_new_str() is provided, that creates Regexp
+object from String object.  This is same as the result of
+have_func("rb_reg_new_str", "ruby.h").
+
+ HAVE_RB_IO_T
+
+Means that type rb_io_t is provided.
+
+
 Appendix C. Functions Available in extconf.rb
 
 These functions are available in extconf.rb: