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Date:   Fri, 15 Apr 2022 15:07:14 -0500
From:   Segher Boessenkool <segher@kernel.crashing.org>
To:     Nick Desaulniers <ndesaulniers@google.com>
Cc:     hjl.tools@gmail.com, Peter Zijlstra <peterz@infradead.org>,
        x86@kernel.org, Josh Poimboeuf <jpoimboe@redhat.com>,
        mbenes@suse.cz, rostedt@goodmis.org,
        linux-toolchains@vger.kernel.org, Fangrui Song <maskray@google.com>
Subject: Re: The trouble with __weak and objtool got worse
Message-ID: <20220415200714.GC25951@gate.crashing.org>
References: <YllUqPK4CWZeHku8@hirez.programming.kicks-ass.net> <20220415182229.GB25951@gate.crashing.org> <CAKwvOdn_U+7_N6kbeyqrdZx-+Dc=BLctQgZMwsxJCPtdyG5Rsw@mail.gmail.com>
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On Fri, Apr 15, 2022 at 11:36:32AM -0700, Nick Desaulniers wrote:
> On Fri, Apr 15, 2022 at 11:27 AM Segher Boessenkool
> <segher@kernel.crashing.org> wrote:
> >
> > > Alternatively:
> > >
> > >   https://sourceware.org/pipermail/binutils/2020-December/114671.html
> > >
> > > seems to suggest: -Wa,--generate-unused-section-symbols=yes, ought to
> > > work, except I'm getting:
> >
> > That email is for a proposed patch.  Did anything further ever happen
> > with it?
> 
> $ gcc hello.c -Wa,--generate-unused-section-symbols=yes
> as: unrecognized option '--generate-unused-section-symbols=yes'
> $ gcc hello.c -Wa,-generate-unused-section-symbols=yes
> $ gcc --version
> gcc (Debian 11.2.0-16) 11.2.0
> 
> Uh, the email says -- prefix, but reality shows a single prefix? What
> happened there? Maybe that link is to an earlier version than what
> landed?

Neither has landed.  You get the -g option, which can take options of
itself, parsed by the target or file format code.  "as -gobbledygook"
works fine as well :-)


Segher