glibc-2.18 should not look up /etc/ld.so.preload

[wavewave]

I installed nix on top of a linux system which has /etc/ld.so.preload. It produces some errors like

ERROR: ld.so: object '/$LIB/snoopy.so' from /etc/ld.so.preload cannot be preloaded: ignored.

although binary seems to work (with those annoying error messages whenever it loads dynamic libraries)

I made a patch for this. With this patch, ld.so will not lookup system ld.so.preload:
eb6b433a35fd183bdfb5594799c7e440ab32293c

BTW, since this is a stdenv change, I do not know what is the best way to make a pull request for this. Can I make it against master branch or do we have some rule for this?

[vcunat]

@edolstra: what about testing this in the glibc-2.19 branch?

[vcunat]

Rebased against 2.19 9da7db9.

[edolstra]

How about using something like /etc/ld-nix.so.preload? Using PREFIX/etc/... is kind of pointless because that file doesn't exist.

[vcunat]

Hmm, yes, that sounds better. It might even get useful to put something into that file, in some cases.

[vcunat]

Pushed the updated patch to glibc-2.19. I guess the reason for PREFIX was that ld.so.cache was solved the same way (but having that kind of global cache seems completely useless, whereas preloading still makes sense).