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Re: Problem with new acl code and cdrtools
- From: Warren Young <wyml at etr-usa dot com>
- To: The Cygwin Mailing List <cygwin at cygwin dot com>
- Date: Mon, 8 Feb 2016 21:14:10 -0700
- Subject: Re: Problem with new acl code and cdrtools
- Authentication-results: sourceware.org; auth=none
- References: <CAFo71_4fDB3WkhXTL7eybNzKh2idVF1UHb7oJjaxFshcS9BFUg at mail dot gmail dot com> <20160208131835 dot GC12975 at calimero dot vinschen dot de> <CAFo71_5=KT=kJY-wz0EZWZ_LBriCjX2s6=5PSVhHRSxx-A92qg at mail dot gmail dot com> <56B8C25F dot 7050206 at lysator dot liu dot se> <CAFo71_4eQ2VMypAnC=Bx_bvbzGvVCs=jj4r9Ax6GDbgaH1zGOQ at mail dot gmail dot com>
On Feb 8, 2016, at 9:59 AM, Ismail Donmez <firstname.lastname@example.org> wrote:
> On Mon, Feb 8, 2016 at 6:29 PM, Peter Rosin <email@example.com> wrote:
>> On 2016-02-08 14:31, Ismail Donmez wrote:
>>> This is a generic code so I don't want to add a cygwin specific
>>> dependency there. Is there a preprocessor definition for cygwin
>>> version? I could use that to disable HAVE_SUN_ACL for cygwin 2.5+
>> Pardon me for butting in, but isn't adding a Cygwin version check
>> about as non-generic as it gets?
>> Wouldn't something like this work:
>> .../configure ac_cv_func_aclfromtext=no
> Thats a hack :)
I donât know if that smiley means youâre joking or if youâre just trying to soften a negative judgement, but Peterâs proposal is as far from a hack as it gets.
He is proposing that you write an autoconf test that determines if the platform has this new ACL behavior. Then in your C code:
# include <cygwin/acl.h>
Now youâre not dependent on Cygwin header file #defines that donât exist yet, and will continue to not exist on older Cygwin installs. You only include the Cygwin header if your autoconf test determines that this is necessary.
This is standard Autoconf practice: check for features, not for platforms or platform versions. This practice comes from 40+ years of Unix portability experience, which is that platform and version tests often break, but feature tests rarely do.
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