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Subject: Re: configure fails on checking ino_t
To: cygwin AT cygwin DOT com
References: <310357481 DOT 6222896 DOT 1496816466443 DOT ref AT mail DOT yahoo DOT com> <310357481 DOT 6222896 DOT 1496816466443 AT mail DOT yahoo DOT com> <CAEhDDbBwtXXqTbrgyb_bHJLBegmSjnC5K5jAQNvtXco4wKK4ng AT mail DOT gmail DOT com> <1185399437 DOT 7584723 DOT 1496867830934 AT mail DOT yahoo DOT com> <1462809442 DOT 7598271 DOT 1496873467329 AT mail DOT yahoo DOT com>
From: Eric Blake <eblake AT redhat DOT com>
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Date: Wed, 7 Jun 2017 17:19:09 -0500
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From: Eric Blake <eblake AT redhat DOT com>
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Subject: Re: configure fails on checking ino_t
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On 06/07/2017 05:11 PM, Lloyd Wood via cygwin wrote:

Please don't top-post on technical lists.

> Aha! just slightly later in config.log:
>=20
> configure:17957: checking for ino_t=20
> configure:17957: gcc -c -g -O2  conftest.c >&5=20
> configure:17957: $? =3D 0=20
> configure:17957: gcc -c -g -O2  conftest.c >&5=20
> conftest.c: In function 'main':=20
> conftest.c:94:20: error: expected expression before ')' token=20
> if (sizeof ((ino_t)))=20
> ^=20

This _particular_ failure is expected (you aren't showing enough of the
config.log output).  Remember, to determine if something is a type vs.
an expression, autoconf performs TWO compilation tests, and relies on
the fact that sizeof(expr) and sizeof((expr)) both compile, but
sizeof(type) compiles while sizeof((type)) must fail.  The back-to-back
compilation is necessary to ensure that something being probed for is a
type name rather than an arbitray expression.

So just because _some_ tests fail (as expected) does not mean that this
particular failure is where configure is messing up.


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


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