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Date:      Tue, 23 Feb 2016 23:50:57 +1100
From:      andrew clarke <mail@ozzmosis.com>
To:        Koichiro IWAO <meta@vmeta.jp>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: how to know if bug 198092 applied in C program?
Message-ID:  <20160223125057.GA41865@ozzmosis.com>
In-Reply-To: <000001530cf44e47-ccacfe21-94cc-4fb0-898b-c726a3c608e1-000000@us-west-2.amazonses.com>
References:  <000001530cf44e47-ccacfe21-94cc-4fb0-898b-c726a3c608e1-000000@us-west-2.amazonses.com>

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On Tue 2016-02-23 07:07:30 UTC+0000, Koichiro IWAO (meta@vmeta.jp) wrote:

> Hello,
> 
> I'm writing a C program and having a question.
> 
> My program is intended to run under stable/9, releng/9.3, stable/10,
> releng/10.2, releng/10.3 and sometimes current.  Stables are not always
> up to date.
> 
> I'd like to check if getaddrinfo(3) supports AI_V4MAPPED using something
> like "#ifdef" or "#if" macros because it is not necessarily 
> implemented[1].
> Probably I can use __FreeBSD_version for that.  Is this way good?

I think you could use a configure script (not necessarily Autoconf)
instead, and test for AI_V4MAPPED support at build time.

https://en.wikipedia.org/wiki/Configure_script



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