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Subject: Re: ssize_t
To: cygwin AT cygwin DOT com
References: <deac8be3-fa7b-1716-0f2b-6974b183ba26 AT gmail DOT com>
From: Eric Blake <eblake AT redhat DOT com>
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Date: Thu, 22 Dec 2016 14:14:44 -0600
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From: Eric Blake <eblake AT redhat DOT com>
To: cygwin AT cygwin DOT com
Message-ID: <3cd8f4f9-2d22-6018-9f84-6a1312042997 AT redhat DOT com>
Subject: Re: ssize_t
References: <deac8be3-fa7b-1716-0f2b-6974b183ba26 AT gmail DOT com>
In-Reply-To: <deac8be3-fa7b-1716-0f2b-6974b183ba26 AT gmail DOT com>


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On 12/22/2016 01:39 PM, Marco Atzeri wrote:
> Hi guys,
>=20
> building latest Imagemagick, the test for ssize_t is now failing with a
> puzzling
>=20
>  $ gcc  ssize_t.c -o ssize_t
> ssize_t.c: In function =E2=80=98main=E2=80=99:
> ssize_t.c:115:22: error: expected expression before =E2=80=98)=E2=80=99 t=
oken
>  if (sizeof ((ssize_t)))
>                       ^
>=20
> any clue what to look for ?

That's probably SUPPOSED to happen.

Autoconf tests for type names by comparing:

sizeof(TYPE) /* should compile */

with

sizeof((TYPE)) /* should not compile */

If 'TYPE' is instead a constant, then both forms will compile.  So it
allows you to probe whether an unknown string (in this case 'ssize_t')
is a type name or some other macro that expands into a constant.

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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