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docs/manual: update to mention eglibc support in Buildroot toolchain backend

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[Peter: minor tweak]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
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Thomas Petazzoni 2013-06-30 21:29:13 +02:00 committed by Peter Korsgaard
parent 8d29893893
commit 30224b8ee2
1 changed files with 26 additions and 26 deletions
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52
docs/manual/configure.txt
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@ -72,11 +72,12 @@ The _internal toolchain backend_ is the backend where Buildroot builds
by itself a cross-compilation toolchain, before building the userspace
applications and libraries for your target embedded system.
This backend is the historical backend of Buildroot, and is limited to
the usage of the http://www.uclibc.org[uClibc C library] (i.e, the
_glibc_ and _eglibc_ C libraries are not supported by this backend,
see the _External toolchain backend_ and _Crosstool-NG toolchain
backend_ for solutions to use either _glibc_ or _eglibc_).
This backend is the historical backend of Buildroot, and has been
limited for a long time to the usage of the
http://www.uclibc.org[uClibc C library]. Support for the _eglibc_ C
library has been added in 2013 and is at this point considered
experimental. See the _External toolchain backend_ and _Crosstool-NG
toolchain backend_ for other solutions to use _glibc_ or _eglibc_.
Once you have selected this backend, a number of options appear. The
most important ones allow to:
@ -99,29 +100,29 @@ most important ones allow to:
the C library might be using interfaces that are not provided by
your Linux kernel.
* Change the version and the configuration of the uClibc C
library. The default options are usually fine. However, if you
really need to specifically customize the configuration of your
uClibc C library, you can pass a specific configuration file
here. Or alternatively, you can run the +make uclibc-menuconfig+
command to get access to uClibc's configuration interface. Note
that all packages in Buildroot are tested against the default
uClibc configuration bundled in Buildroot: if you deviate from this
configuration by removing features from uClibc, some packages may
no longer build.
* Change the version and the configuration of the uClibc C library
(if uClibc is selected). The default options are usually
fine. However, if you really need to specifically customize the
configuration of your uClibc C library, you can pass a specific
configuration file here. Or alternatively, you can run the +make
uclibc-menuconfig+ command to get access to uClibc's configuration
interface. Note that all packages in Buildroot are tested against
the default uClibc configuration bundled in Buildroot: if you
deviate from this configuration by removing features from uClibc,
some packages may no longer build.
* Change the version of the GCC compiler and binutils.
* Select a number of toolchain options: whether the toolchain should
have largefile support (i.e support for files larger than 2 GB on
32 bits systems), IPv6 support, RPC support (used mainly for NFS),
wide-char support, locale support (for internationalization), C++
support, thread support. Depending on which options you choose, the
number of userspace applications and libraries visible in Buildroot
menus will change: many applications and libraries require certain
toolchain options to be enabled. Most packages show a comment when
a certain toolchain option is required to be able to enable those
packages.
* Select a number of toolchain options (uClibc only): whether the
toolchain should have largefile support (i.e support for files
larger than 2 GB on 32 bits systems), IPv6 support, RPC support
(used mainly for NFS), wide-char support, locale support (for
internationalization), C++ support, thread support. Depending on
which options you choose, the number of userspace applications and
libraries visible in Buildroot menus will change: many applications
and libraries require certain toolchain options to be enabled. Most
packages show a comment when a certain toolchain option is required
to be able to enable those packages.
It is worth noting that whenever one of those options is modified,
then the entire toolchain and system must be rebuilt. See
@ -137,7 +138,6 @@ Drawbacks of this backend:
* Rebuilding the toolchain is needed when doing +make clean+, which
takes time. If you're trying to reduce your build time, consider
using the _External toolchain backend_.
* Limited to the _uClibc_ C library.
[[external-toolchain-backend]]
External toolchain backend