Clean up declaration of __cxa_get_globals

At least Clang trunk towards 3.4 now rejects incompatible declarations of the
same extern "C" function in different namespaces, so that trick of getting at
the function that is exported by libstdc++ but only rudimentarily if at all
exposed in cxxabi.h no longer worked.

TODO: This change should be reflected in any other bridges where it is relevant,
too.

(cherry picked from commit 5ba3d1740b03efa394b2d2bf34fb8a8d3db2331d)

Signed-off-by: Luboš Luňák <l.lunak@centrum.cz>

Conflicts:
	configure.ac

Change-Id: Ie3ccbdb7d75cc98636d02c0435958532620724f2

3 files changed, 25 insertions, 9 deletions

diff --git a/bridges/source/cpp_uno/gcc3_linux_x86-64/except.cxx b/bridges/source/cpp_uno/gcc3_linux_x86-64/except.cxx
index ea38f2973e92..8229ce8f1e61 100644
--- a/bridges/source/cpp_uno/gcc3_linux_x86-64/except.cxx
+++ b/bridges/source/cpp_uno/gcc3_linux_x86-64/except.cxx
@@ -22,11 +22,6 @@
 #include <string.h>
 #include <dlfcn.h>
 
-#include <cxxabi.h>
-#ifndef _GLIBCXX_CDTOR_CALLABI // new in GCC 4.7 cxxabi.h
-#define _GLIBCXX_CDTOR_CALLABI
-#endif
-
 #include <boost/unordered_map.hpp>
 
 #include <rtl/strbuf.hxx>
diff --git a/bridges/source/cpp_uno/gcc3_linux_x86-64/share.hxx b/bridges/source/cpp_uno/gcc3_linux_x86-64/share.hxx
index c305197e1655..f3f43e5719ea 100644
--- a/bridges/source/cpp_uno/gcc3_linux_x86-64/share.hxx
+++ b/bridges/source/cpp_uno/gcc3_linux_x86-64/share.hxx
@@ -17,12 +17,20 @@
  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  */
 
-#include "uno/mapping.h"
+#include "sal/config.h"
 
 #include <typeinfo>
 #include <exception>
 #include <cstddef>
 
+#include <cxxabi.h>
+#ifndef _GLIBCXX_CDTOR_CALLABI // new in GCC 4.7 cxxabi.h
+#define _GLIBCXX_CDTOR_CALLABI
+#endif
+
+#include "config_gcc.h"
+#include "uno/mapping.h"
+
 namespace CPPU_CURRENT_NAMESPACE
 {
 
@@ -65,7 +73,17 @@ struct __cxa_eh_globals
 
 }
 
-extern "C" CPPU_CURRENT_NAMESPACE::__cxa_eh_globals *__cxa_get_globals () throw();
+// __cxa_get_globals is exported from libstdc++ since GCC 3.4.0 (CXXABI_1.3),
+// but it is only declared in cxxabi.h (in namespace __cxxabiv1) since
+// GCC 4.7.0.  It returns a pointer to a struct __cxa_eh_globals, but that
+// struct is only incompletely declared even in the GCC 4.7.0 cxxabi.h.
+// Therefore, provide a declaration here for old GCC (libstdc++, really) version
+// that returns a void pointer, and in the code calling it always cast to the
+// above fake definition of CPPU_CURRENT_NAMESPACE::__cxa_eh_globals (which
+// hopefully keeps matching the real definition in libstdc++):
+#if !HAVE_GCC_CXXABI_H_CXA_GET_GLOBALS
+namespace __cxxabiv1 { extern "C" void * __cxa_get_globals () throw(); }
+#endif
 
 namespace CPPU_CURRENT_NAMESPACE
 {
diff --git a/bridges/source/cpp_uno/gcc3_linux_x86-64/uno2cpp.cxx b/bridges/source/cpp_uno/gcc3_linux_x86-64/uno2cpp.cxx
index cbf45bb094d2..08c797c8bd02 100644
--- a/bridges/source/cpp_uno/gcc3_linux_x86-64/uno2cpp.cxx
+++ b/bridges/source/cpp_uno/gcc3_linux_x86-64/uno2cpp.cxx
@@ -289,8 +289,11 @@ static void cpp_call(
     }
      catch (...)
      {
-          // fill uno exception
-        fillUnoException( __cxa_get_globals()->caughtExceptions, *ppUnoExc, pThis->getBridge()->getCpp2Uno() );
+         // fill uno exception
+         fillUnoException(
+             reinterpret_cast< CPPU_CURRENT_NAMESPACE::__cxa_eh_globals * >(
+                 __cxxabiv1::__cxa_get_globals())->caughtExceptions,
+             *ppUnoExc, pThis->getBridge()->getCpp2Uno());
 
         // temporary params
         for ( ; nTempIndizes--; )