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X-HELO:	calimero.vinschen.de
Date:	Wed, 22 Jun 2016 19:17:30 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Piping on 64-bit Cygwin was Re: [ANNOUNCEMENT] llvm 3.7.1-2
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On Jun 22 10:01, Warren Young wrote:
> On Jun 22, 2016, at 9:36 AM, Corinna Vinschen <corinna-cygwin AT cygwin DOT com>=
 wrote:
> >=20
> >> 64-bit Windows is LLP64, while 64-bit Linux is LP64 on the same hardwa=
re.
> >=20
> > s/Linux/Linux and Cygwin/
>=20
> Well, that was unexpected.

The FAQ entry is just as old as the first 64 bit release...

> Still, you could get similar problems.  ifdefs for portable
> sized-integer types are a particularly rich source of bugs, especially
> ones where #ifdef WINDOWS precedes any test that could match Cygwin,
> since WINDOWS is defined in Cygwin=E2=80=99s GCC, and as this exchange sh=
ows,

No, it isn't.  Neither is _WIN32 or _WINNT_, unless you include
<windows.h>.  Try `gcc -dM -E - < /dev/null | grep WIN'

> Cygwin=E2=80=99s GCC doesn=E2=80=99t always behave exactly the same as Vi=
sual C++.
>=20
> Any such case will compile under Cygwin.  You need to reorder such
> cases so a the test for WINDOWS is after one matching Cygwin, as a
> rule.

Varargs functions are fun.  A type mismatch int/long in the 5th and 6th
arg would be invisible on Linux but potentially crash on Cygwin due to
the ABI difference (MS vs. SysV).  We found a bug in OpenLDAP this way.

Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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