[Bug debug/12267] [3.4 regression] function-at-a-time generates stabs in bad order

["mec at shout dot net" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From mec at shout dot net  2003-12-01 19:07 -------
I executed Wolfgang's suggestion and did a date search with -funit-at-a-time
enabled.

The bad .stabs line appeared between 2003-04-11 03:00:00 UTC and 2003-04-11
04:30 UTC (these times are on the subversions.gnu.org repository,
cvsroot=:pserver:anoncvs:@subversions.gnu.org:/cvsroot/gcc).

The patch which caused this is:

  2003-04-10  Zack Weinberg  <zack@codesourcery.com>

        * c-decl.c (struct binding_level): Add shadowed_tags and
        function_body; remove this_block, tag_transparent, and
        subblocks_tag_transparent; update comments.
        ...

  2003-04-10  Zack Weinberg  <zack@codesourcery.com>

        * c-tree.h (struct lang_identifier): Replace global_value,
        local_value members with symbol_value, tag_value.  Kill
        implicit_decl and limbo_value.
        ...

There are two ChangeLog entries here, but only one patch.

There is some discussion here:

  http://gcc.gnu.org/ml/gcc-patches/2003-04/msg00766.html
  http://gcc.gnu.org/ml/gcc-patches/2003-04/msg00767.html

In the followup to 00767, Neil Booth said: "I once tried to remove the extra
contour, which gave a bootstrappable compiler but with screwy debug info IIRC. 
At that point I gave up.", and Zack said "I don't think the debug info is
screwed by this ... I suppose we'll find out."  Heh.

I will attach a couple of generated assembly files from the compilers just
before and after the regression.

Michael C

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |zack at codesourcery dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12267