2 // vim: set syntax=asciidoc:
5 Customizing the toolchain
6 ~~~~~~~~~~~~~~~~~~~~~~~~~
8 There are three distinct types of toolchain backend supported in Buildroot,
9 available under the menu +Toolchain+, invoking +make menuconfig+.
11 Using the external toolchain backend
12 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
14 There is no way of tuning an external toolchain since Buildroot does not
17 It also requires to set the Buildroot settings according to the toolchain ones
18 (see xref:external-toolchain-backend[]).
20 Using the internal Buildroot toolchain backend
21 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
23 The internal Buildroot toolchain backend *only* allows to generate
24 *http://www.uclibc.org/[uClibc]-based toolchains*.
26 However, it allows to tune major settings, such as:
28 * Linux headers version;
30 * http://www.uclibc.org/[uClibc] configuration (see xref:uclibc-custom[uClibc]);
32 * Binutils, GCC, Gdb and toolchain options.
34 These settings are available after selecting the +Buildroot toolchain+ type in
37 Using the Crosstool-NG backend
38 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
40 The http://crosstool-ng.org[crosstool-NG] toolchain backend enables a rather
41 limited set of settings under the Buildroot +Toolchain+ menu:
43 * The http://crosstool-ng.org[crosstool-NG] configuration file
45 * Gdb and some toolchain options
47 Then, the toolchain can be fine-tuned by invoking +make ctng-menuconfig+.