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From: Luis Machado <>
To: Keith Seitz <>,
	"" <>
Subject: Re: Expected output of gdb.cp/no-dmgl-verbose.exp
Date: Mon, 12 Apr 2021 15:55:25 -0300	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 4/12/21 3:45 PM, Keith Seitz wrote:
> On 4/12/21 11:16 AM, Luis Machado via Gdb wrote:
>> I'm trying to determine why this particular test is failing (for both
>> aarch64-linux and x86_64-linux on Ubuntu 18.04/20.04) and what the
>> expected outcome is.
>> In my case, the only symbol I see for function "f" is the following:
>> "f(std::__cxx11::basic_string<char, std::char_traits<char>,
>> std::allocator<char> >)"
>> There is no "f(std::string)" nor "f(std::basic_string<char,
>> std::char_traits<char>, std::allocator<char> >)" symbol.
> Wow, such a long time ago! IIRC...

Indeed. I vaguely remember that, back in ~2011 IIRC. But obviously not 
enough to figure out what was going on.

> This test was written to ensure that "std::string" was used
> instead of "std::basic_string<...>" (which is now called something
> else again). Something about "that's what nm and other tools tell users,
> so we should not mention the symbol's real (linkage) name, either."
> The "no-dmgl-verbose" refers to the DMGL_VERBOSE option
> of the demangler, which does this.
> There is even special logic in our typedef-replacing machinery to
> enforce this. [NOTE: `ignore_typedefs' in cp-support.c is also "out-
> of-date" wrt to this naming change. So none of that has likely been
> "working" for many years, but then at very quick glance, "nm -C" doesn't
> do this anymore, either.]

Ah, that makes it much more clear. Thanks for the explanation.

> I was against it then, so I certainly do not mind getting rid of this test
> or limiting it to C++ installations that typedef the "older" std::basic_string<...>
> to std::string.

I think keeping it may be more confusing than useful. I'll propose its 
removal on gdb-patches@ and we'll see where we go from there.

Thanks Keith.

> Keith

  reply	other threads:[~2021-04-12 18:55 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-12 18:16 Luis Machado
2021-04-12 18:45 ` Keith Seitz
2021-04-12 18:55   ` Luis Machado [this message]
2021-04-12 20:07     ` David Blaikie
2021-04-13  8:57     ` Tom de Vries

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