[Buildroot] How do you add to library path?

[Bernhard Reutner-Fischer]

On 26 April 2012 19:42, Grant Edwards <grant.b.edwards at gmail.com> wrote:
> 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...

$ grep -A8 config\ LDSO_CACHE extra/Configs/Config.in
config LDSO_CACHE_SUPPORT
	bool "Enable library loader cache (ld.so.conf)"
	depends on HAVE_SHARED
	default y
	help
	  Enable this to make use of /etc/ld.so.conf, the shared library loader
	  cache configuration file to support for non-standard library paths.
	  After updating this file, it is necessary to run 'ldconfig' to update
	  the /etc/ld.so.cache shared library loader cache file.
$ make help | grep util
  utils			- build target utilities
  hostutils		- build host utilities (see utils)
  install_utils		- install target utilities
  install_hostutils	- install host utilities

Generally speaking, you can globally export variables for sh in e.g.
/etc/profile

HTH,