[Bug gdb/22501] New: Incorrect sizeof(symbol) == 4 on a 64-bit platform

["bugzilla at tecnocode dot co.uk" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22501

            Bug ID: 22501
           Summary: Incorrect sizeof(symbol) == 4 on a 64-bit platform
           Product: gdb
           Version: 7.12
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: bugzilla at tecnocode dot co.uk
  Target Milestone: ---

If I compile GLib normally on a 64-bit platform, without CFLAGS=-g, run a test
program, and `print sizeof(__glib_assert_msg)`, gdb (incorrectly) tells me it’s
4 bytes: However, it’s a char*, and its size according to objdump is
(correctly) 8 bytes:

(gdb) print sizeof(__glib_assert_msg)
$1 = 4
(gdb) print sizeof(char*)
$2 = 8

objdump -t ./glib/.libs/libglib-2.0.so.0.5400.2 | grep assert_msg
000000000032c3e0 g     O .bss    0000000000000008             
__glib_assert_msg

No debug information is being loaded while running gdb:

(gdb) info sharedlibrary
>From                To                  Syms Read   Shared Object Library
0x00007ffff7dd9aa0  0x00007ffff7df51b0  Yes         /lib64/ld-linux-x86-64.so.2
0x00007ffff7ac6e90  0x00007ffff7b5ae90  Yes (*)    
/tmp/build-snapshot.Ry9JWQsWNS/s/glib/.libs/libglib-2.0.so.0
0x00007ffff772c910  0x00007ffff7856423  Yes        
/lib/x86_64-linux-gnu/libc.so.6
0x00007ffff749b5d0  0x00007ffff74edab1  Yes (*)    
/lib/x86_64-linux-gnu/libpcre.so.3
0x00007ffff7282ab0  0x00007ffff728f811  Yes        
/lib/x86_64-linux-gnu/libpthread.so.0
(*): Shared library is missing debugging information.

I can provide other information if needed.

---

This looks similar to bug #12281. The downstream GLib bug which triggered this
is https://bugzilla.gnome.org/show_bug.cgi?id=782057.

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