Getting past gcc-3.2 20000611 breakage.

[Matt Thomas <matt at 3am-software dot com>]

I'm currently working on getting the VAX ELF support I've done for
gcc-2.95.3 in NetBSD applied to the gcc mainline branch.

Progress was going well until I cvs updated my sources yesterday.
gcc-3.2 started breaking on very simple sources which worked fine
before:

GNU C version 3.2 20020611 (experimental) (vax-netbsdelf)
        compiled by GNU C version 2.95.3 20010315 (release) (NetBSD nb2).
<stdin>: In function `x':
<stdin>:9: error: missing barrier after block 0
<stdin>:9: internal compiler error: verify_flow_info failed

void x(int a) {
        switch (a) {
        case 1: d(); break;
        default: abort();
        case 3: e(); break;
        case 7: e(); break;
        case 15: e(); break;
        }
}

Now I suspect the problem is related to the following change:
2002-06-05  David S. Miller  <davem@redhat.com>
        Delete SEQUENCE rtl usage outside of reorg and ssa passes.

but fixing it is beyond my abilties to fix.  By doing dated cvs
updates I was about to verify -D'2002/06/11 UTC' sources work while
-D'2002/06/12 UTC' sources fail.  The above Change appeared in the
ChangeLog between the two update.

I've prepared my first set of changes for VAX ELF but I can't test
them (expect for compiling) on the latest sources since they fail.
They do work with the 20000610 sources (I'm running a NetBSD/vax
userland with them) and they should be submitted as a patch real soon.

My question is what to do now for my further development?  Back up to
the 2000/06/11 source and do development from there?  Hold off and wait
for the breakage to be fixed?

--
Matt Thomas               Internet:   matt@3am-software.com
3am Software Foundry      WWW URL:    http://www.3am-software.com/bio/matt/
Cupertino, CA             Disclaimer: I avow all knowledge of this message