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bash has a concept of "loadables", which are "plugins" that can be
loaded at runtime by bash to add new builtin. For example:
# type whoami
whoami is hashed (/usr/bin/whoami)
# whoami
root
# enable -f /usr/lib/bash/whoami whoami
# type whoami
whoami is a shell builtin
# whoami
root
# enable -d whoami
# type whoami
whoami is hashed (/usr/bin/whoami)
# whoami
root
bash comes with a set of example loadables, installed in
/usr/lib/bash/. They take 312 KB on ARM32, and are by default not
used, and provide builtins that are for the most part already
available as external commands in Busybox/coreutils:
Makefile.inc finfo mkfifo realpath sync
accept head mktemp rm tee
basename id mypid rmdir truefalse
csv ln pathchk seq tty
cut loadables.h print setpgid uname
dirname logname printenv sleep unlink
fdflags mkdir push strftime whoami
So instead of having them unconditionally installed, add an option to
enable/disable their installation (their build apparently cannot be
disabled via a configure option).
Normally, we try to keep backward compatibility by preserving the
existing behavior. In this case, this would have meant making this
option "default y". But this also breaks our principle of "being
minimal by default", and in this case, it feels preferable to be
"minimal by default" than preserving existing behavior.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches