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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> <4e8c3f47-fb4b-eb8d-12d9-6ad40e219279 AT redhat DOT com>
From: Eric Blake <eblake AT redhat DOT com>
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Date: Wed, 16 Aug 2017 20:54:58 -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: <6fe7ba4d-f88f-3ef0-92ff-15cd667f190d AT redhat DOT com>
Subject: Re: stdnoreturn: fix for Cygwin
References: <4260817 DOT MvLg4Vb6y4 AT omega>
 <4e8c3f47-fb4b-eb8d-12d9-6ad40e219279 AT redhat DOT com>
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On 08/16/2017 07:59 PM, Eric Blake wrote:
> Adding cygwin list...
>=20
> 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:
>>
>> /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)));
>=20
>> +
>> +   Similarly, on Cygwin, standard include files contain declarations li=
ke
>> +     void __cdecl abort (void) __attribute__ ((noreturn));
>> +   "#define noreturn _Noreturn" would cause this declaration to be rewr=
itten
>> +   to the invalid
>> +     void __cdecl abort (void) __attribute__ ((__attribute__ ((__noretu=
rn__))));
>=20
> 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.
>=20
> I'll look into patching Cygwin to fix all barename attributes I can find
> that should be __barename__ instead.

On a closer look, I've already done this, several years ago (although a
few more have crept in since then):
https://cygwin.com/git/gitweb.cgi?p=3Dnewlib-cygwin.git;a=3Dcommitdiff;h=3D=
ada456dcf

Bruno, your cygwin installation of 1.7.30 is old, compared to current 2.8.2

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


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