[uClibc] [PATCH] Config option for /etc/ld.so.preload

[Peter Kjellerstedt]

After the addition of a configuration option for
enabling the support of /etc/ld.so.cache, I thought
it might be a good idea to add one for the support
of the /etc/ld.so.preload file too. So here it is.

While doing this, I also noticed that the dynamic
linker would hang indefinitely if either LD_PRELOAD 
or /etc/ld.so.preload contained a library which was
already loaded, so I made a patch for that too.

And of course, I could not resist from doing a little
clean up of comments and indentation, so here is a
patch for that too.

//Peter

PS. The three patches are supposed to be applied in 
the  following order: dup_libs.patch, preload.patch 
and ldso_cleanup.patch.
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