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From: "tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug symtab/30174] New: Rework 'main' name yet again
Date: Sun, 26 Feb 2023 16:33:03 +0000
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X-Bugzilla-Version: HEAD
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30174

            Bug ID: 30174
           Summary: Rework 'main' name yet again
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

The new DWARF indexer broke 'main' handling for some languages.
This was bug #30116.

However, I wonder if the fix for #30116 made startup a bit slower
for C and C++ programs.  The problem here is that the patch
removed the checks for a function named "main".  So, we can
no longer tell the language of "main" without a symbol lookup.
But -- this means waiting for finalization to be complete.

One solution would be to resurrect some old patches to make
the main-name stuff lazy.  Partly that involved something like:

#define current_language lazily_compute_language()

Another idea would be to have a "quick" function that does this
work.  Right now we have lookup_global_symbol_language, which
is used for this and only has a single caller -- it could easily
be made more specific.

The idea here would be to simply assume that if the objfile
has any C++ code at all, then use C++ as the language; otherwise
use C.  Perhaps like other languages the symbol could just
be searched for in minsyms.

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