freebsd-src/rescue
John Baldwin 5e4854cbf8 rescue: Link libzutil after libzfs.
libzfs depends on symbols defined in libzutil.  For static linking
ld.bfd is less forgiving than lld, so rescue was failing to link when
using ld.bfd due to unresolved symbols from libzutil used by libzfs.

Reviewed by:	imp, kib, emaste
Differential Revision:	https://reviews.freebsd.org/D36811
2022-10-03 16:10:42 -07:00
..
librescue build: provide a default WARNS for all in-tree builds 2020-09-18 17:17:46 +00:00
rescue rescue: Link libzutil after libzfs. 2022-10-03 16:10:42 -07:00
Makefile
README

The /rescue build system here has three goals:

1) Produce a reliable standalone set of /rescue tools.

The contents of /rescue are all statically linked and do not depend on
anything in /bin or /sbin.  In particular, they'll continue to
function even if you've hosed your dynamic /bin and /sbin.  For
example, note that /rescue/mount runs /rescue/mount_nfs and not
/sbin/mount_nfs.  This is more subtle than it looks.

As an added bonus, /rescue is fairly small (thanks to crunchgen) and
includes a number of tools (such as gzip, bzip2, vi) that are not
normally found in /bin and /sbin.

2) Demonstrate robust use of crunchgen.

These Makefiles recompile each of the crunchgen components and include
support for overriding specific library entries.  Such techniques
should be useful elsewhere.

3) Produce a toolkit suitable for small distributions.

Install /rescue on a CD or CompactFlash disk, and symlink /bin and
/sbin to /rescue to produce a small and fairly complete FreeBSD
system.

These tools have one big disadvantage: being statically linked, they
cannot use some advanced library functions that rely on dynamic
linking.  In particular, nsswitch, locales, and pam all
rely on dynamic linking.


To compile:

# cd /usr/src/rescue
# make obj
# make
# make install

Note that rebuilds don't always work correctly; if you run into
trouble, try 'make clean' before recompiling.

$FreeBSD$