[PATCHv3] librt: Add posix_spawn support

[Mike Frysinger]

On Friday 27 April 2012 19:59:34 Rich Felker wrote:
> On Fri, Apr 27, 2012 at 07:35:11PM -0400, Mike Frysinger wrote:
> > On Friday 27 April 2012 18:33:08 Rich Felker wrote:
> > > But nowadays it's
> > > just really annoying and harmful. With shared libraries, it adds bloat
> > > and load time to every program which wants to use clock_gettime for
> > > getting system time, which is every modern program.
> > 
> > i'd side with the clock_* funcs being better in libc because they are
> > getting used more and more as people transition away from gettimeofday()
> 
> And they are NOT part of any optional realtime option in POSIX;
> they're a mandatory part of POSIX base.

afaik, POSIX doesn't cover library layout in any way.  there is nothing 
requiring us to stick all mandatory interfaces into -lc.  after all, much of 
the math support falls into this category yet lives in -lm.

> > > Is anybody really opposed to just making librt.a empty, librt.so
> > > nonexistent, and putting all the functions in libc.a/libc.so where
> > > they belong?
> > 
> > it would be really cool if we could split lesser used and standalone code
> > into standalone shared libraries and libc.so was a simple linker script
> > that pulled in all the other objects AS_NEEDED(...).  but alas, that'd
> > play havoc with ABI/SONAMEs.
> 
> I don't understand how this is all that useful. If you have binaries
> on your system that use standard functionality X, you'll have to have
> it _somewhere_ anyway, and it might as well be in libc.so. If you're
> worried about rare functions being spread out across lots of pages
> that might also contain widely-used functions and increasing average
> paged-in memory usage, it would be possible to add section attributes
> to all the rare stuff to put it all in one contiguous part of libc.so
> that would only be paged-in when stuff is actually using it.

not everyone have virtual memory :p.  ignoring that, larger single libraries 
means more reloc processing at init, and more string space to search when 
resolving symbols.
-mike
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