Re: [libvirt] [PATCH] always compile iptables.c
On Fri, Nov 07, 2008 at 03:34:59PM +0100, Jim Meyering wrote:
"Richard W.M. Jones" <rjones(a)redhat.com> wrote:
> On an unrelated point, probably any usage of __MINGW32__ is suspect, eg:
s/any/any *other*/ ?
I'm pretty sure "any", in this case too.
>> #else /* __MINGW32__ */
>
> Our MinGW cross-compiler defines the symbol 'WIN32', and so do all
> compilers on Windows itself[1][2].
>
> Therefore it's better to use #ifdef WIN32 ... #endif for any code that
> is specific to the Win32 API.
>
> The __MINGW32__ symbol has a place for code which is specific to the
> MinGW version of GCC, eg. if it had a bug that we needed to work
> around.
In the case of lstat, that use of __MINGW32__ is deliberate, since
the guarded code is needed only on mingw, and not on cygwin.
So using WIN32 there would be wrong.
Cygwin isn't like other Windows compilers -- it exposes a Unix/POSIX
API (not Win32 which is a completely different API, even though some
of the calls happen to look superficially similar).
Cygwin doesn't define WIN32 symbol[1], so using WIN32 here should be OK.
Anyway, I don't think anyone is using Cygwin to compile libvirt. The
licensing issues alone mean that it'd be unacceptable to most of our
users.
Rich.
[1] Well, that's not entirely true: if you use Cygwin and then include
<windows.h>, you do get WIN32 symbol defined, because by doing this
you've got both POSIX _and_ Win32 APIs available. WIN32 tells you
that the Win32 API is available, not that POSIX is unavailable.
--
Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones
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