X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/3e1bf71c36f0a7f032e9cd105132a0df51d29059..84ec90e90a90bc9b5a284b5c2e44b05349add5f6:/acinclude.m4

diff --git a/acinclude.m4 b/acinclude.m4
index 5402dd104d..1a43281a71 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 ===========================================================================
@@ -423,7 +437,44 @@ AC_DEFUN([WX_VERSIONED_SYMBOLS],
         else
           wx_cv_version_script=no
         fi
+
+        dnl There's a problem in some old linkers with --version-script that
+        dnl can cause linking to fail when you have objects with vtables in
+        dnl libs 3 deep.  This is known to happen in netbsd and openbsd with
+        dnl ld 2.11.2.
+        dnl 
+        dnl To test for this we need to make some shared libs and
+        dnl unfortunately we can't be sure of the right way to do that. If the
+        dnl first two compiles don't succeed then it looks like the test isn't
+        dnl working and the result is ignored, but if OTOH the first two
+        dnl succeed but the third does not then the bug has been detected and
+        dnl the --version-script flag is dropped.
+        if test $wx_cv_version_script = yes
+        then
+          echo "struct B { virtual ~B() { } }; \
+                struct D : public B { }; \
+                void F() { D d; }" > conftest.cpp
+
+          if AC_TRY_COMMAND([
+                $CXX -shared -fPIC -o conftest1.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
+                -Wl,--version-script,conftest.sym >/dev/null 2>/dev/null]) &&
+             AC_TRY_COMMAND([
+                $CXX -shared -fPIC -o conftest2.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
+                -Wl,--version-script,conftest.sym conftest1.output >/dev/null 2>/dev/null])
+          then
+            if AC_TRY_COMMAND([
+                  $CXX -shared -fPIC -o conftest3.output $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.cpp
+                  -Wl,--version-script,conftest.sym conftest2.output conftest1.output >/dev/null 2>/dev/null])
+            then
+              wx_cv_version_script=yes
+            else
+              wx_cv_version_script=no
+            fi
+          fi
+        fi
+
         rm -f conftest.output conftest.stderr conftest.sym conftest.cpp
+        rm -f conftest1.output conftest2.output conftest3.output
       ])
       if test $wx_cv_version_script = yes ; then
         LDFLAGS_VERSIONING="-Wl,--version-script,$1"
@@ -595,6 +646,27 @@ if test "$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 "$ac_cv_cxx_reinterpret_cast" = yes; then
+  AC_DEFINE(HAVE_REINTERPRET_CAST,,
+            [define if the compiler supports reinterpret_cast<>])
+fi
+])
+
 dnl and http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_static_cast.html
 AC_DEFUN([AC_CXX_STATIC_CAST],
 [AC_CACHE_CHECK(whether the compiler supports static_cast<>,
@@ -613,3 +685,22 @@ if test "$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
+])
+