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- # ===========================================================================
- # https://www.gnu.org/software/autoconf-archive/ax_cxx_dynamic_cast.html
- # ===========================================================================
- #
- # SYNOPSIS
- #
- # AX_CXX_DYNAMIC_CAST
- #
- # DESCRIPTION
- #
- # If the compiler supports dynamic_cast<>, define HAVE_DYNAMIC_CAST.
- #
- # LICENSE
- #
- # Copyright (c) 2008 Todd Veldhuizen
- # Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
- #
- # Copying and distribution of this file, with or without modification, are
- # permitted in any medium without royalty provided the copyright notice
- # and this notice are preserved. This file is offered as-is, without any
- # warranty.
-
- #serial 7
-
- AU_ALIAS([AC_CXX_DYNAMIC_CAST], [AX_CXX_DYNAMIC_CAST])
- AC_DEFUN([AX_CXX_DYNAMIC_CAST],
- [AC_CACHE_CHECK(whether the compiler supports dynamic_cast<>,
- ax_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;],
- ax_cv_cxx_dynamic_cast=yes, ax_cv_cxx_dynamic_cast=no)
- AC_LANG_RESTORE
- ])
- if test "$ax_cv_cxx_dynamic_cast" = yes; then
- AC_DEFINE(HAVE_DYNAMIC_CAST,,[define if the compiler supports dynamic_cast<>])
- fi
- ])
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