X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/b4eecb7e2f52c0df1067c005eaf6f4c47cc6bca9..05df0f1bc76be62a464a6b7dec10a35c2019b990:/acinclude.m4

diff --git a/acinclude.m4 b/acinclude.m4
index e49126ddcb..df0283d35d 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -580,3 +580,21 @@ if test "$enable_largefile" != no; then
     AC_MSG_RESULT($wx_largefile)
 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
+])