[Buildroot] How do you add to library path?

[Grant Edwards]

What's the right way to permanently add a directory to the search path
for dynamic libraries?  (Preferably at build-time, rather than at
run-time.)

I've added the directory path to /etc/ld.so.conf using a post-build
script. But, that file seems to be ignored at boot time (and there is
no "ldconfig" to run even if I wanted to).

I suppose I could set LD_LIBRARY_PATH globally, but for performance
reasons, I'd prefer that the new path went into /etc/ld.so.cache. [I'm
not sure how one sets a global environment variable anyway.]

There have been several threads about this in the past, but none of
them seemed to offer any answers...

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