20 lines
736 B
Plaintext
20 lines
736 B
Plaintext
dnl Available from the GNU Autoconf Macro Archive at:
|
|
dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_dynamic_cast.html
|
|
dnl
|
|
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
|
|
])
|