[Bug libgcj/50057] [4.7 regression] misalignment of java_exception_header resulted in throwable to be null

[ktietz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50057

--- Comment #5 from Kai Tietz <ktietz at gcc dot gnu.org> 2012-02-10 19:19:56 UTC ---
Hmm, I assume issue is related to using of -mms-bitfields for 4.7 for
windows-targets.

Does the following patch fix the issue?

Index: exception.cc
===================================================================
--- exception.cc        (revision 184105)
+++ exception.cc        (working copy)
@@ -33,12 +33,18 @@
 }
 #include "unwind.h"

+#ifdef __MINGW32__
+__attribute__ ((gcc_struct))
+#endif
 struct alignment_test_struct
 {
   char space;
   char end[0] __attribute__((aligned));
 };

+#ifdef __MINGW32__
+__attribute__ ((gcc_struct))
+#endif
 struct java_exception_header
 {
   /* Cache handler details between Phase 1 and Phase 2.  */