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Subject:	Re: stdnoreturn: fix for Cygwin
To:	Bruno Haible <bruno AT clisp DOT org>, bug-gnulib AT gnu DOT org,
	The Cygwin Mailing List <cygwin AT cygwin DOT com>
References:	<4260817 DOT MvLg4Vb6y4 AT omega>
From:	Eric Blake <eblake AT redhat DOT com>
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Date:	Wed, 16 Aug 2017 19:59:55 -0500
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From: Eric Blake <eblake AT redhat DOT com>
To: Bruno Haible <bruno AT clisp DOT org>, bug-gnulib AT gnu DOT org,
 The Cygwin Mailing List <cygwin AT cygwin DOT com>
Message-ID: <4e8c3f47-fb4b-eb8d-12d9-6ad40e219279 AT redhat DOT com>
Subject: Re: stdnoreturn: fix for Cygwin
References: <4260817 DOT MvLg4Vb6y4 AT omega>
In-Reply-To: <4260817 DOT MvLg4Vb6y4 AT omega>


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Adding cygwin list...

On 08/16/2017 07:01 PM, Bruno Haible wrote:
> On Cygwin 1.7.30, I'm seeing this testdir build failure, when compiling
> test-stdnoreturn.c:
>=20
> /usr/include/stdlib.h:66:28: error: expected =E2=80=98,=E2=80=99 or =E2=
=80=98;=E2=80=99 before =E2=80=98)=E2=80=99 token
>  _VOID _EXFUN(abort,(_VOID) _ATTRIBUTE ((noreturn)));

> +
> +   Similarly, on Cygwin, standard include files contain declarations like
> +     void __cdecl abort (void) __attribute__ ((noreturn));
> +   "#define noreturn _Noreturn" would cause this declaration to be rewri=
tten
> +   to the invalid
> +     void __cdecl abort (void) __attribute__ ((__attribute__ ((__noretur=
n__))));

Hmm. It's evil for any system .h file to ever use
__attribute__((barename)), since barename is in the user's namespace and
can therefore be defined to anything else, possibly breaking the header
(as you just proved).  Hopefully, the problem goes away if cygwin
patches its headers to use __attribute__((__noreturn__)), so that gnulib
can then define noreturn at will.

I'll look into patching Cygwin to fix all barename attributes I can find
that should be __barename__ instead.

--=20
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org


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