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added AC_CXX_DYNAMIC_CAST

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32573 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2005-03-03 10:39:46 +00:00
parent 265a3864bb
commit d1150ea70f
1 changed files with 19 additions and 0 deletions
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19
acinclude.m4
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@ -705,3 +705,22 @@ if test "$ac_cv_cxx_static_cast" = yes; then
AC_DEFINE(HAVE_STATIC_CAST,, [define if the compiler supports static_cast<>]) AC_DEFINE(HAVE_STATIC_CAST,, [define if the compiler supports static_cast<>])
fi fi
]) ])
dnl http://autoconf-archive.cryp.to/ac_cxx_dynamic_cast.html
AC_DEFUN([AC_CXX_DYNAMIC_CAST],
[AC_CACHE_CHECK(whether the compiler supports dynamic_cast<>,
ac_cv_cxx_dynamic_cast,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([#include <typeinfo>
class Base { public : Base () {} virtual void f () = 0;};
class Derived : public Base { public : Derived () {} virtual void f () {} };],[
Derived d; Base& b=d; return dynamic_cast<Derived*>(&b) ? 0 : 1;],
ac_cv_cxx_dynamic_cast=yes, ac_cv_cxx_dynamic_cast=no)
AC_LANG_RESTORE
])
if test "$ac_cv_cxx_dynamic_cast" = yes; then
AC_DEFINE(HAVE_DYNAMIC_CAST,,[define if the compiler supports dynamic_cast<>])
fi
])