Re: java/7611: Internal error while compiling libjava with -O

[Tom Tromey <tromey@redhat.com>]

The following reply was made to PR java/7611; it has been noted by GNATS.

From: Tom Tromey <tromey@redhat.com>
To: Thomas Greve <tgreve@pc61.ixmid.com>
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: java/7611: Internal error while compiling libjava with -O
Date: 16 Aug 2002 15:55:43 -0600

 >>>>> "Thomas" == Thomas Greve <tgreve@pc61.ixmid.com> writes:
 
 Thomas> java/io/FilePermission.java:153: internal error in generate_bytecode_insn - tree code not implemented: bit_field_ref
 
 The problem here is that gcc will sometimes change a field access into
 a bit-field access.  This happens in the tree-simplification routines
 (offhand I forget exactly where, but I think there is another PR on
 this topic).  The bytecode back end doesn't understand bit fields, and
 changing this would be difficult.
 
 I'm surprised to see this happen on x86.  Previously I believe it was
 only a problem on the alpha.
 
 Try building without -O (the .class files are all that matter).  That
 might help.
 
 I once started a patch to add a lang-hook to let `gcj -C' disable this
 particular optimization.  I still have it lying around somewhere but I
 haven't found the time to test it on my alpha box yet :-(
 
 Tom