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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug symtab/30661] New: [gdb/symtab] main symbol language lookup
 causes symtab expansion
Date: Fri, 21 Jul 2023 07:34:24 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: symtab
X-Bugzilla-Version: HEAD
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: vries at gcc dot gnu.org
X-Bugzilla-Status: NEW
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30661

            Bug ID: 30661
           Summary: [gdb/symtab] main symbol language lookup causes symtab
                    expansion
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Consider a hello world:
...
$ gcc -g hello.c=20
...

With gdb-12-branch:
...
$ gdb -q -batch a.out -ex "maint info symtabs"
$
...

With gdb-13-branch:
...
$ gdb -q -batch a.out -ex "maint info symtabs"
{ objfile /data/vries/gdb/a.out ((struct objfile *) 0x146ca90)
  { ((struct compunit_symtab *) 0x1460fc0)
    debugformat DWARF 4
    producer GNU C11 7.5.0 -mtune=3Dgeneric -march=3Dx86-64 -g
    name hello.c
  ...
...

This is a feature that was added to work around the slowness in expansion of
lto debug info, in order to not have to wait too long for the "file a.out" =
to
finish.

Feature was added in commit d3214198119 ("[gdb] Use partial symbol table to
find language for main").

This seems to have regressed.

--=20
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