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 ===========================================================================
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
fi
AC_LANG_RESTORE
- fi
])
dnl ---------------------------------------------------------------------------
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,$1"
AC_DEFINE(HAVE_CONST_CAST,,[define if the compiler supports const_cast<>])
fi
])
+
+dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_reinterpret_cast.html
+AC_DEFUN([AC_CXX_REINTERPRET_CAST],
+[AC_CACHE_CHECK(whether the compiler supports reinterpret_cast<>,
+ac_cv_cxx_reinterpret_cast,
+[AC_LANG_SAVE
+ AC_LANG_CPLUSPLUS
+ AC_TRY_COMPILE([#include <typeinfo>
+class Base { public : Base () {} virtual void f () = 0;};
+class Derived : public Base { public : Derived () {} virtual void f () {} };
+class Unrelated { public : Unrelated () {} };
+int g (Unrelated&) { return 0; }],[
+Derived d;Base& b=d;Unrelated& e=reinterpret_cast<Unrelated&>(b);return g(e);],
+ ac_cv_cxx_reinterpret_cast=yes, ac_cv_cxx_reinterpret_cast=no)
+ AC_LANG_RESTORE
+])
+if test "$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<>,
+ac_cv_cxx_static_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 () {} };
+int g (Derived&) { return 0; }],[
+Derived d; Base& b = d; Derived& s = static_cast<Derived&> (b); return g (s);],
+ ac_cv_cxx_static_cast=yes, ac_cv_cxx_static_cast=no)
+ AC_LANG_RESTORE
+])
+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
+])
+
projects / wxWidgets.git / blobdiff