[Bug debug/20253] [3.4/4.0/4.1 regression]: Macro debug info broken due to lexer change

["dberlin at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From dberlin at gcc dot gnu dot org  2005-02-28 20:39 -------
Devang, we *need* to have a start_source_file for the main source file.
It is required by the standard that we ouptut a begin/end pair for the main
source file, and the start_source_file call is where this should be done.

If STABS needs to do something else, it should simply ignore the first call to
start_source file.

Please note that this fixing this may break your followup patch to try to fix
-feliminate-dwarf2-dups, and cause it to be redone:

----------------------------
revision 1.457
date: 2003/10/06 22:25:15;  author: dpatel;  state: Exp;  lines: +1 -10
Fix -feliminate-dwarf2-dups ICE.

       gcc
       * dwarf2out.c (is_main_source): Remove variable.
       (dwarf2out_start_source_file): Do not check is_main_source.
       Do not reset is_main_source.
       (dwarf2out_init): Do not initialize is_main_source.

       testsuite
       * gcc.dg/debug/dwarf2-3.h: New test.
       * gcc.dg/debug/dwarf2-3.c: New test case for -feliminate-dwarf2-dups.

The check i meant below to look for in the .s file is actually wrong, you want
to look for 
  .byte   0x3     # Start new file
        .uleb128 0x0    # Included from line number 0
        .file 1 "<filename of test>"


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20253