[Bug c++/27539] New: FAIL: gdb.cp/typeid.exp: before starting: print &typeid(i)

[Bug c++/27539] New: FAIL: gdb.cp/typeid.exp: before starting: print &typeid(i)

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27539

            Bug ID: 27539
           Summary: FAIL: gdb.cp/typeid.exp: before starting: print
                    &typeid(i)
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

On openSUSE tumbleweed, I run into:
...
FAIL: gdb.cp/typeid.exp: before starting: print &typeid(i)
FAIL: gdb.cp/typeid.exp: before starting: print &typeid(i) ==
&typeid(typeof(i))
FAIL: gdb.cp/typeid.exp: before starting: print &typeid(cp)
FAIL: gdb.cp/typeid.exp: before starting: print &typeid(cp) ==
&typeid(typeof(cp))
FAIL: gdb.cp/typeid.exp: before starting: print &typeid(ccp)
FAIL: gdb.cp/typeid.exp: before starting: print &typeid(ccp) ==
&typeid(typeof(ccp))
...

The first in more detail:
...
(gdb) file typeid^M
Reading symbols from typeid...^M
(gdb) print &typeid(i)^M
could not find typeinfo symbol for 'int'^M
(gdb) FAIL: gdb.cp/typeid.exp: before starting: print &typeid(i)
...

Easily reproduced on command line using:
...
$ gdb -batch ./outputs/gdb.cp/typeid/typeid -ex "print typeid (int)"
could not find typeinfo symbol for 'int'
...

Interestingly though, if we first start, we get::
...
$ gdb -batch ./outputs/gdb.cp/typeid/typeid -ex start -ex "print typeid (int)"
Temporary breakpoint 1 at 0x40112a: file typeid.cc, line 52.

Temporary breakpoint 1, main () at typeid.cc:52
52        const std::type_info &xi = typeid(i);
$1 = {_vptr.type_info = 0x7ffff7fa0218 <vtable for
__cxxabiv1::__fundamental_type_info+16>, __name = 0x7ffff7f31554 <typeinfo name
for int> "i"}
...

In the latter case we get the minimal symbol from:
...
$ readelf -r /usr/lib64/libstdc++.so.6.0.29 | c++filt | grep "typeinfo for int"
00000020a710  04d300000001 R_X86_64_64       000000000020a738 typeinfo for
int@@CXXABI_1.3 + 0
00000020a730  04d300000001 R_X86_64_64       000000000020a738 typeinfo for
int@@CXXABI_1.3 + 0
...

While in the former case we fail to find the minimal symbol:
...
$ readelf -r ./outputs/gdb.cp/typeid/typeid | c++filt | grep "typeinfo for int"
000000403c20  000a00000005 R_X86_64_COPY     0000000000403c20 typeinfo for
int@CXXABI_1.3 + 0
...

The only difference I notice is '@@' vs '@'.

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[Bug c++/27539] FAIL: gdb.cp/typeid.exp: before starting: print &typeid(i)

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27539

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Bisects to:
...
commit 3f2e9699234ca31d083bc93ea6e03903f10baeaf
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Sat Aug 22 08:31:53 2020 -0700

    elf: Keep only one '@' for undefined versioned symbols

    The symbol string table in the .symtab section is optional and cosmetic.
    Keep only one '@' for undefined versioned symbols, which are defined in
    shared objects, in the symbol string table.  Update "nm -D" to display
    only one '@' for undefined versioned symbols.
...

Commit first appeared in 2.36 release.

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[Bug c++/27539] FAIL: gdb.cp/typeid.exp: before starting: print &typeid(i)

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27539

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
I'm seeing this also on fedora asahi 39, aarch64-linux, with target board
unix/-fPIE/-pie.

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