From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Thu, 3 Mar 2005 10:39:46 +0000 (+0000)
Subject: added AC_CXX_DYNAMIC_CAST
X-Git-Url: https://git.saurik.com/wxWidgets.git/commitdiff_plain/d1150ea70ffa66b3e4bd0dfade91d8bc393b0e05

added AC_CXX_DYNAMIC_CAST


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32573 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---

diff --git a/acinclude.m4 b/acinclude.m4
index 05197a1d7c..3adc66c377 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -705,3 +705,22 @@ if test "$ac_cv_cxx_static_cast" = yes; then
   AC_DEFINE(HAVE_STATIC_CAST,, [define if the compiler supports static_cast<>])
 fi
 ])
+
+dnl http://autoconf-archive.cryp.to/ac_cxx_dynamic_cast.html
+AC_DEFUN([AC_CXX_DYNAMIC_CAST],
+[AC_CACHE_CHECK(whether the compiler supports dynamic_cast<>,
+ac_cv_cxx_dynamic_cast,
+[AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ AC_TRY_COMPILE([#include <typeinfo>
+class Base { public : Base () {} virtual void f () = 0;};
+class Derived : public Base { public : Derived () {} virtual void f () {} };],[
+Derived d; Base& b=d; return dynamic_cast<Derived*>(&b) ? 0 : 1;],
+ ac_cv_cxx_dynamic_cast=yes, ac_cv_cxx_dynamic_cast=no)
+ AC_LANG_RESTORE
+])
+if test "$ac_cv_cxx_dynamic_cast" = yes; then
+  AC_DEFINE(HAVE_DYNAMIC_CAST,,[define if the compiler supports dynamic_cast<>])
+fi
+])
+