X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/f49735950644f04c639b3bdfc7b6cf23ac9ad9e2..f530fa27a92ea58071c83aa7bfe0a859626b39e7:/acinclude.m4

diff --git a/acinclude.m4 b/acinclude.m4
index 5402dd104d..6269f806f4 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -595,6 +595,27 @@ if test "$ac_cv_cxx_const_cast" = yes; then
 fi
 ])
 
+dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_reinterpret_cast.html
+AC_DEFUN([AC_CXX_REINTERPRET_CAST],
+[AC_CACHE_CHECK(whether the compiler supports reinterpret_cast<>,
+ac_cv_cxx_reinterpret_cast,
+[AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ AC_TRY_COMPILE([#include <typeinfo>
+class Base { public : Base () {} virtual void f () = 0;};
+class Derived : public Base { public : Derived () {} virtual void f () {} };
+class Unrelated { public : Unrelated () {} };
+int g (Unrelated&) { return 0; }],[
+Derived d;Base& b=d;Unrelated& e=reinterpret_cast<Unrelated&>(b);return g(e);],
+ ac_cv_cxx_reinterpret_cast=yes, ac_cv_cxx_reinterpret_cast=no)
+ AC_LANG_RESTORE
+])
+if test "$ac_cv_cxx_reinterpret_cast" = yes; then
+  AC_DEFINE(HAVE_REINTERPRET_CAST,,
+            [define if the compiler supports reinterpret_cast<>])
+fi
+])
+
 dnl and http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_static_cast.html
 AC_DEFUN([AC_CXX_STATIC_CAST],
 [AC_CACHE_CHECK(whether the compiler supports static_cast<>,