SF Patch #728691, dangling pointer fix

[wxWidgets.git] / aclocal.m4

diff --git a/aclocal.m4 b/aclocal.m4
index 5bec16026b4b1b36bb7a66d885b4856a54b67050..2f8507f5c75c8342487c48fb2edc865614f23ff5 100644 (file)
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -593,6 +593,24 @@ if test "$enable_largefile" != no; then
 fi
 ])
 
+
+dnl Available from the GNU Autoconf Macro Archive at:
+dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_const_cast.html
+dnl
+AC_DEFUN([AC_CXX_CONST_CAST],
+[AC_CACHE_CHECK(whether the compiler supports const_cast<>,
+ac_cv_cxx_const_cast,
+[AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ AC_TRY_COMPILE(,[int x = 0;const int& y = x;int& z = const_cast<int&>(y);return z;],
+ ac_cv_cxx_const_cast=yes, ac_cv_cxx_const_cast=no)
+ AC_LANG_RESTORE
+])
+if test "$ac_cv_cxx_const_cast" = yes; then
+  AC_DEFINE(HAVE_CONST_CAST,,[define if the compiler supports const_cast<>])
+fi
+])
+
 # Configure paths for GTK+
 # Owen Taylor     1997-2001