X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/fe947a6116844e23acf8458512f452904a4f08f9..d181e0532987ae568eca8b1965f84b953cfb4a13:/acinclude.m4

diff --git a/acinclude.m4 b/acinclude.m4
index 81c6f2b474..65ad9e93d8 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -8,6 +8,20 @@ dnl
 dnl Version: $Id$
 dnl ---------------------------------------------------------------------------
 
+
+dnl ===========================================================================
+dnl Objective-C(++) related macros
+dnl ===========================================================================
+m4_define([AC_WX_LANG_OBJECTIVEC],
+[AC_LANG(C)
+ac_ext=m
+])
+
+m4_define([AC_WX_LANG_OBJECTIVECPLUSPLUS],
+[AC_LANG(C++)
+ac_ext=mm
+])
+
 dnl ===========================================================================
 dnl macros to find the a file in the list of include/lib paths
 dnl ===========================================================================
@@ -88,14 +102,11 @@ dnl WX_CPP_NEW_HEADERS checks whether the compiler has "new" <iostream> header
 dnl or only the old <iostream.h> one - it may be generally assumed that if
 dnl <iostream> exists, the other "new" headers (without .h) exist too.
 dnl
-dnl call WX_CPP_NEW_HEADERS(actiof-if-true, action-if-false-or-cross-compiling)
+dnl call WX_CPP_NEW_HEADERS(actiof-if-true, action-if-false)
 dnl ---------------------------------------------------------------------------
 
 AC_DEFUN([WX_CPP_NEW_HEADERS],
 [
-  if test "$cross_compiling" = "yes"; then
-    ifelse([$2], , :, [$2])
-  else
     AC_LANG_SAVE
     AC_LANG_CPLUSPLUS
 
@@ -108,7 +119,6 @@ AC_DEFUN([WX_CPP_NEW_HEADERS],
     fi
 
     AC_LANG_RESTORE
-  fi
 ])
 
 dnl ---------------------------------------------------------------------------
@@ -599,6 +609,27 @@ if test "$ac_cv_cxx_const_cast" = yes; then
 fi
 ])
 
+dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_reinterpret_cast.html
+AC_DEFUN([AC_CXX_REINTERPRET_CAST],
+[AC_CACHE_CHECK(whether the compiler supports reinterpret_cast<>,
+ac_cv_cxx_reinterpret_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 () {} };
+class Unrelated { public : Unrelated () {} };
+int g (Unrelated&) { return 0; }],[
+Derived d;Base& b=d;Unrelated& e=reinterpret_cast<Unrelated&>(b);return g(e);],
+ ac_cv_cxx_reinterpret_cast=yes, ac_cv_cxx_reinterpret_cast=no)
+ AC_LANG_RESTORE
+])
+if test "$ac_cv_cxx_reinterpret_cast" = yes; then
+  AC_DEFINE(HAVE_REINTERPRET_CAST,,
+            [define if the compiler supports reinterpret_cast<>])
+fi
+])
+
 dnl and http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_static_cast.html
 AC_DEFUN([AC_CXX_STATIC_CAST],
 [AC_CACHE_CHECK(whether the compiler supports static_cast<>,
@@ -617,3 +648,22 @@ if test "$ac_cv_cxx_static_cast" = yes; then
   AC_DEFINE(HAVE_STATIC_CAST,, [define if the compiler supports static_cast<>])
 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
+])
+