X-Recipient: archive-cygwin AT delorie DOT com DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:subject:to:references:from:message-id:date :mime-version:in-reply-to:content-type; q=dns; s=default; b=ARdi cJg2hDrIHYKUZ0ocFv6/bYoHvE/O5NPUpCEMFL2RqLOTOpadoxAkfxSfO+uApoPz YEDW1jR8a6v3L2b04d5XrTOm8qFGTnPjtP6Y5kdLmw2KdS6gMAAYTT0gwip15UZx 34JGDKPBWpDLqnsUfE8B0RS00tLVV/2/UNC0zTw= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:subject:to:references:from:message-id:date :mime-version:in-reply-to:content-type; s=default; bh=NC8r2n//2I xUwqQLttcaFr0hkJg=; b=K01QLYn/dE0pjj0PGwRAy03v0pM7NXroh0qr2IfT7A /cBs9WNhrMSKqifZniRF6vpCbYgclhnUB9Ppro4fQcZwcYRl/RArqzu+53cxGYkh Kzb5OXzxAuy5xomV1KaOYJ6+fgeQZo9Gu0M+fPBcYV1mtMb9xMgo+9ZA6GT6f06l E= Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-5.0 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy=conftest, ALSO, Hx-languages-length:1227, H*i:sk:75c5307 X-HELO: mx1.redhat.com Subject: Re: ssize_t To: cygwin AT cygwin DOT com References: <75c5307a-2c10-dfbb-5c9d-08f52e3e0db8 AT t-online DOT de> From: Eric Blake Openpgp: url=http://people.redhat.com/eblake/eblake.gpg Message-ID: <862d1661-017c-01ed-f33f-ccf3e4ed1f70@redhat.com> Date: Thu, 22 Dec 2016 15:11:11 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: <75c5307a-2c10-dfbb-5c9d-08f52e3e0db8@t-online.de> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="Gbfnd1XTeX6Jeieeb2DkH5vc7LKc0wc5U" X-IsSubscribed: yes --Gbfnd1XTeX6Jeieeb2DkH5vc7LKc0wc5U Content-Type: multipart/mixed; boundary="7meN3D08MG5BU1R1VASALP4nBw2mKchPP"; protected-headers="v1" From: Eric Blake To: cygwin AT cygwin DOT com Message-ID: <862d1661-017c-01ed-f33f-ccf3e4ed1f70 AT redhat DOT com> Subject: Re: ssize_t References: <75c5307a-2c10-dfbb-5c9d-08f52e3e0db8 AT t-online DOT de> In-Reply-To: <75c5307a-2c10-dfbb-5c9d-08f52e3e0db8 AT t-online DOT de> --7meN3D08MG5BU1R1VASALP4nBw2mKchPP Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 12/22/2016 02:51 PM, Hans-Bernhard Br=C3=B6ker wrote: > Am 22.12.2016 um 20:39 schrieb Marco Atzeri: >=20 >> building latest Imagemagick, the test for ssize_t is now failing with a >> puzzling >> >> $ 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 = token >> if (sizeof ((ssize_t))) >> ^ >> >> any clue what to look for ? >=20 >=20 > The test case reduces to a very simple one-liner: >=20 > int bar =3D sizeof((int)); >=20 > Replacing the double (()) by single () gets rid of the miscompilation. >=20 > That looks like a bona fide GCC bug. That is NOT a gcc bug, but deliberate configure behavior. Remember, not ALL conftest compilation probes during configure failures are supposed to compile - some are expected to fail. Debugging configure failures requires that you ALSO know whether the compilation failure is expected (as in this case), by knowing additional context of WHY configure is trying to compile the test code (here, to PROVE that ssize_t is an actual type name, and not just a variable name that expands to an expression rather than a type). --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org --7meN3D08MG5BU1R1VASALP4nBw2mKchPP-- --Gbfnd1XTeX6Jeieeb2DkH5vc7LKc0wc5U Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCAAGBQJYXEFwAAoJEKeha0olJ0NqF+0H/2u1YOqDUTeorf97A9z38Ney opO/g5+l4/h8lg4Xx/RW7vHGUcU8qlPrQrBtpeXoObJJy/BSrwa72Oxth/n0o33s 8kXu0hfnsJXCg854eSeDaLhrz8fwqinLR/ydPtAqw53mnj3Gz8E7kXs3r7UA9t0J oDiou4c/h+ZNU+Odcpc111A7pt/sXLZ4E7PruNHAAoLU4cIxOooAGuwEdc/uKK1X YaNI4iLO2xzYyXzzl5PVZd+DDIBwlTj8TU0tNuAhPK2rW7sta3XjdLb3kXgt2KVN pyn7H7j8M1/vh9LBtdKrT6hxQFgGZ4mH/E6MbKn9Sk6uPh080Oi/AbMiJDg3DBI= =BolH -----END PGP SIGNATURE----- --Gbfnd1XTeX6Jeieeb2DkH5vc7LKc0wc5U--