William Harrington wrote:
On Sat, 24 Feb 2018 13:56:30 +0000
Hazel Russman <hazeldeb...@googlemail.com> wrote:
Most of the commands in this section have a prefix setting LD_LIBRARY_PATH to
/tools/lib but the reason for this is not explained anywhere. May I suggest a
brief explanation like:
LD_LIBRARY_PATH=/tools/lib: this allows the use of the blkid library installed
in chapter 5 as part of util-linux.
--
--
Or even at the start of building LFS:
http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html
3.3.1. LD_LIBRARY_PATH
You can temporarily substitute a different library for this particular
execution. In Linux, the environment variable LD_LIBRARY_PATH is a
colon-separated set of directories where libraries should be searched for
first, before the standard set of directories; this is useful when debugging a
new library or using a nonstandard library for special purposes. The
environment variable LD_PRELOAD lists shared libraries with functions that
override the standard set, just as /etc/ld.so.preload does. These are
implemented by the loader /lib/ld-linux.so. I should note that, while
LD_LIBRARY_PATH works on many Unix-like systems, it doesn't work on all; for
example, this functionality is available on HP-UX but as the environment
variable SHLIB_PATH, and on AIX this functionality is through the variable
LIBPATH (with the same syntax, a colon-separated list).
LD_LIBRARY_PATH is handy for development and testing, but shouldn't be modified
by an installation process for normal use by normal users; see ``Why
LD_LIBRARY_PATH is Bad'' at http://www.visi.com/~barr/ldpath.html for an
explanation of why. But it's still useful for development or testing, and for
working around problems that can't be worked around otherwise. If you don't
want to set the LD_LIBRARY_PATH environment variable, on Linux you can even
invoke the program loader directly and pass it arguments. For example, the
following will use the given PATH instead of the content of the environment
variable LD_LIBRARY_PATH, and run the given executable:
/lib/ld-linux.so.2 --library-path PATH EXECUTABLE
Just executing ld-linux.so without arguments will give you more help on using
this, but again, don't use this for normal use - these are all intended for
debugging.
It really helps if these suggestions are done in tickets so they don't get
forgotten if we don't get to them right away.
I created ticket http://wiki.linuxfromscratch.org/lfs/ticket/4224 for this
issue.
-- Bruce
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