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From Tollef Fog Heen <tfh...@err.no>
Subject Re: Run-time selection of poll implementation
Date Mon, 16 Oct 2006 10:25:23 GMT
Joe Orton skrev:
> On Sat, Oct 14, 2006 at 09:04:34PM +0200, Tollef Fog Heen wrote:
>> Currently, apr chooses whether to use epoll, kqueue, port, select or
>> poll at build-time.  This works quite well if your apr library is only
>> used on hosts with the same capabilities as the one you built on.
>> However, if you build on Linux 2.6 and try to use the binaries on
>> Linux 2.4, they don't work (due to the epoll interface not existing on
>> 2.4).
> 
> Of course, so don't do that.  If your lowest supported kernel revision 
> is 2.4, then you have to build on a 2.4 kernel so APR won't use any 2.6 
> features.  Otherwise you have to force particular choices by doing e.g. 
> "export apr_cv_epoll=no" before running configure, to prevent detection 
> of 2.6 features.

Wouldn't it be better if APR chose at runtime instead of just 
segfaulting like it does today?

- tfheen

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