HEADS-UP: Planning on deprecating libc_r for 6.0

Scott Long scottl at samsco.org
Wed Apr 13 09:49:38 PDT 2005

M. Warner Losh wrote:
> In message: <425D2041.7020501 at samsco.org>
>             Scott Long <scottl at samsco.org> writes:
> : One question that has come up is how to warn the user at runtime about
> : this deprecation.  Should the dynamic linker print a message to stderr
> : when it gets a request to load libc_r?  Should it go to the console
> : and/or syslog instead?  Should there be a way to disable these messages
> : so as not to break wrapper programs that might be confused by the
> : output?  Should we even bother at all with runtime warnings?
> I'd do a build-time warning only.
> This would allow poeple to deploy systems with libc_r and not have
> annoying warnings at a customer's site.  They will know that things
> are deprecated.  Also, compat librarires will be around for a while,
> so doing things at runtime seems annoying...
> As far as my company's use of libc_r, we don't yet know how well
> non-libc_r works yet since we've not done any large threaded FreeBSD 5
> applications yet.  So I can't comment on how wise/foolish this option
> is with any direct experience.
> Warner

Yes, outfits like yours and Julian's are exactly what I had in mind when 
I said that it would be several years before it goes away, and even then
it would live on in /usr/lib/compat.


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