Date: Mon, 13 Aug 2012 07:14:40 -0700 From: mdf@FreeBSD.org To: Hooman Fazaeli <hoomanfazaeli@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: How to know __FreeBSD_version for a symbol Message-ID: <CAMBSHm9N6jOmDUt-1A-AzVcVp5DpZ_E=x9gNZ4cyV%2B6JQ7jA=Q@mail.gmail.com> In-Reply-To: <5028B9C4.60000@gmail.com>
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On Mon, Aug 13, 2012 at 1:24 AM, Hooman Fazaeli <hoomanfazaeli@gmail.com> wrote: > Hi hackers > > In the process of back porting drivers to older freebsd versions, > We sometimes need to add suitable '#if __FreeBSD_version >= xxxxx ... else > ... ' > directives to the source to use an alternate function or exclude certain > statements, defines, etc. > > What is the best (quick/reliable) way to know in which __FreeBSD_version > a symbol (function, struct member, macro, ...) has been first introduced? As far as I know it's a slightly painful look over SVN logs. First, find the SVN revision that introduced or changed the relevant symbol. Then, look at the SVN history of sys/sys/param.h for changes to __FreeBSD_version symbol. The one that's from the same or later SVN revision as the symbol change is the value you'll need. Cheers, matthewhome | help
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