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From: Florian Weimer <fw@deneb.enyo.de>
To: sotrdg sotrdg via Libc-help <libc-help@sourceware.org>
Cc: sotrdg sotrdg <euloanty@live.com>
Subject: Re: how to find dlopen be able to find shared library in
 /lib/xxx/yyyy?
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Date: Sat, 02 Jan 2021 11:02:42 +0100
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 (sotrdg sotrdg via Libc-help's message of "Sat, 2 Jan 2021 04:37:48
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* sotrdg sotrdg via Libc-help:

> I have an C.UTF-8.so at /usr/local/lib/fast_io_i18n_data/locale/C.UTF-8.s=
o.
>
> I tried to do
> dlopen(=E2=80=9Cfast_io_i18n_data/locale/C.UTF-8.so=E2=80=9D,RTLD_GLOBAL =
| RTLD_NOW);
>
> However, the dlls cannot get found.

You need to provide the full (absolute) path to the shared object.
Searching only happens if the dlopen argument doesn ot contain a slash.
You can still use $LIB to paper over 32-bit/64-bit differences.