[RFC] Uninitialized section index internal error on Tru64 5.1

[Joel Brobecker <brobecker@ACT-Europe.FR>]

This follows up on a discussion started over a year ago... Lack of time
prevented me from persuing this issue. Hopefully we can make progress
quickly. The last message on this topic was sent by me, and contains
a full description of what I believe is the source of the problem:

    http://sources.redhat.com/ml/gdb-patches/2001-11/msg00296.html

The following patch fixes many regressions in the testsuite:
    Summary 1       2
    FAIL    1644    792
    PASS    4388    6990
    XFAIL   59      149
    XPASS   1       3

I compiled on Tru64 5.1A, using GCC.

This patch is not meant to be integrated as is, this is more a first
rough fix presented so that we can discuss more precisely which
direction to take in order to complete the work.

In particular, should the "if section-is-uninitialized then discard"
bits be always there regardless of the target? Or should we put in place
some configure test in order to execute this test only on targets were
this is needed (alpha-osf is the only one that I know of).

There is also the get_section_index function that I quickly threw in. I
suppose it should be defined in a  .h file, and implemented somewhere
else than in mdebugread.c.

Cheers,
-- 
Joel