[Bug dynamic-link/22747] ld.so --library-path doesn't always work

[carlos at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22747

Carlos O'Donell <carlos at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |carlos at redhat dot com

--- Comment #1 from Carlos O'Donell <carlos at redhat dot com> ---
If you use --enable-hardcoded-path-in-tests the tests are built with -Wl,-rpath
and this embeds the library search path into DT_RPATH/DT_RUNPATH, both of which
take precedence over ld.so's --library-path which is equivalent to setting
LD_LIBRARY_PATH IIRC.

To prove this you could try using LD_PRELOAD to preload the required libraries
and that would certainly force them to be loaded before DT_RPATH/DT_RUNPATH.

Therefore I don't think there is a bug here.

(a) ld.so --library-path is equivalent to LD_LIBRARY_PATH.

(b) If you use DT_RPATH/DT_RUNPATH in a binary, like is done with
--enable-hardcoded-path-in-tests, you must use LD_PRELOAD to get a different
set of loaded libraries that match the ld.so you're using to run the test.

Does that make sense?

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