Merge pull request #2991 from shyouhei/ruby.h

Split ruby.h

1 files changed, 52 insertions, 0 deletions

diff --git a/include/ruby/3/cast.h b/include/ruby/3/cast.h
new file mode 100644
index 0000000000..d9725ce17d
--- /dev/null
+++ b/include/ruby/3/cast.h
@@ -0,0 +1,52 @@
+/**                                                     \noop-*-C++-*-vi:ft=cpp
+ * @file
+ * @author     Ruby developers <ruby-core@ruby-lang.org>
+ * @copyright  This  file  is   a  part  of  the   programming  language  Ruby.
+ *             Permission  is hereby  granted,  to  either redistribute  and/or
+ *             modify this file, provided that  the conditions mentioned in the
+ *             file COPYING are met.  Consult the file for details.
+ * @warning    Symbols   prefixed   with   either  `RUBY3`   or   `ruby3`   are
+ *             implementation details.   Don't take  them as canon.  They could
+ *             rapidly appear then vanish.  The name (path) of this header file
+ *             is also an  implementation detail.  Do not expect  it to persist
+ *             at the place it is now.  Developers are free to move it anywhere
+ *             anytime at will.
+ * @note       To  ruby-core:  remember  that   this  header  can  be  possibly
+ *             recursively included  from extension  libraries written  in C++.
+ *             Do not  expect for  instance `__VA_ARGS__` is  always available.
+ *             We assume C99  for ruby itself but we don't  assume languages of
+ *             extension libraries. They could be written in C++98.
+ * @brief      Defines RUBY3_CAST.
+ * @cond       INTERNAL_MACRO
+ *
+ * This casting macro makes sense only inside  of other macros that are part of
+ * public headers.  They could be used  from C++, and C-style casts could issue
+ * warnings.  Ruby internals are pure C so they should not bother.
+ */
+#include "ruby/3/compiler_since.h"
+#include "ruby/3/has/warning.h"
+#include "ruby/3/warning_push.h"
+
+#if defined(RUBY3_CAST)
+# /* Take that. */
+
+#elif ! defined(__cplusplus)
+# define RUBY3_CAST(expr) (expr)
+
+#elif RUBY3_COMPILER_SINCE(GCC, 4, 6, 0)
+# /* g++ has -Wold-style-cast since 1997 or so, but its _Pragma is broken. */
+# /* See https://gcc.godbolt.org/z/XWhU6J */
+# define RUBY3_CAST(expr) (expr)
+# pragma GCC diagnostic ignored "-Wold-style-cast"
+
+#elif RUBY3_HAS_WARNING("-Wold-style-cast")
+# define RUBY3_CAST(expr)                   \
+    RUBY3_WARNING_PUSH()                    \
+    RUBY3_WARNING_IGNORED(-Wold-style-cast) \
+    (expr)                                  \
+    RUBY3_WARNING_POP()
+
+#else
+# define RUBY3_CAST(expr) (expr)
+#endif
+/** @endcond */