manual: add make-tips.txt

// -*- mode:doc -*- ;

[[make-tips]]

'make' tips

-----------

Because Buildroot is a set of Makefiles and patches, there are few

things useful to know, such as:

+make *config+ commands offer a search tool. Read the help message in

the different frontend menu to know how to use it:

* in _menuconfig_, search tool is called by pressing +/+;

* in _xconfig_, search tool is called by pressing +ctrl+ + +f+.

The result of the search show the help message of the matching items.

Display all command executed by make:

--------------------

 $ make V=0|1 <target>

--------------------

Display all available targets:

--------------------

 $ make help

--------------------

Note that some settings in the +.config+ file may hide some targets:

* +busybox-menuconfig+ depends on whether +busybox+ is enabled or not

  in the +Package selection+ menu

* +linux-menuconfig+ and +linux-savedefconfig+ depend on whether

  +linux+ is enabled or not

* +uclibc-menuconfig+ depends on whether the toolchain uses the

  Buildroot internal toolchain backend or not

* +ctng-menuconfig+ depends on whether the toolchain uses the

  crosstool-NG backend or not

* +barebox-menuconfig+ and +barebox-savedefconfig+ depend on whether

  +barebox+ bootloader is enabled or not

Delete all build products (including build directories, host, staging

and target trees, the images and the toolchain):

--------------------

 $ make clean

--------------------

Delete all build products as well as the configuration:

--------------------

 $ make distclean

--------------------

Note that if +ccache+ is enabled, running +make clean|distclean+ does

not empty the cache of compiler used by Buildroot. To delete it, refer

to xref:ccache[].

This section explains how you can customize Buildroot to fit your

needs.

include::make-tips.txt[]

include::customize.txt[]

include::common-usage.txt[]