mirror of
https://gitlab.com/buildroot.org/buildroot.git
synced 2026-09-09 16:01:54 -09:00
e6e60becb0
Linaro has just released a new pre-built toolchain, available as a tarball, which is a pure toolchain (only the C library is included). This makes this new Linaro 2012.01 toolchain usable in Buildroot, so let's integrate the support for it. In addition to simply adding the new external toolchain at the usual locations, this patch allows need to adapt a few things to support Linaro toolchains. Most toolchains store their libraries in the "lib/" or "usr/lib" directories relative to the toolchain. Buildroot toolchains on the other hand, store the libraries in the "usr/<target-name>/lib" directory. And the Linaro toolchain has choosen to use the "lib/<target-name>" directory. Therefore, this patch adjust: * The logic to search a particular library when that library needs to be copied to the target directory * The logic to deduce the sysroot directory from the libc.a file location in the toolchain: removing "(usr/?)lib(64?)" is no longer sufficient, we need to take into account the "lib/<target-name>/" case. Since the Linaro toolchain generates code for Cortex-A processors only, the selection of this toolchain is limited to Cortex-A8 and Cortex-A9. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
To build and use the buildroot stuff, do the following:
1) run 'make menuconfig'
2) select the packages you wish to compile
3) run 'make'
4) wait while it compiles
5) Use your shiny new root filesystem. Depending on which sort of
root filesystem you selected, you may want to loop mount it,
chroot into it, nfs mount it on your target device, burn it
to flash, or whatever is appropriate for your target system.
You do not need to be root to build or run buildroot. Have fun!
Offline build:
==============
In order to do an offline-build (not connected to the net), fetch all
selected source by issuing a
$ make source
before you disconnect.
If your build-host is never connected, then you have to copy buildroot
and your toplevel .config to a machine that has an internet-connection
and issue "make source" there, then copy the content of your dl/ dir to
the build-host.
Building out-of-tree:
=====================
Buildroot supports building out of tree with a syntax similar
to the Linux kernel. To use it, add O=<directory> to the
make command line, E.G.:
$ make O=/tmp/build
And all the output files (including .config) will be located under /tmp/build.
More finegrained configuration:
===============================
You can specify a config-file for uClibc:
$ make UCLIBC_CONFIG_FILE=/my/uClibc.config
And you can specify a config-file for busybox:
$ make BUSYBOX_CONFIG_FILE=/my/busybox.config
To use a non-standard host-compiler (if you do not have 'gcc'),
make sure that the compiler is in your PATH and that the library paths are
setup properly, if your compiler is built dynamically:
$ make HOSTCC=gcc-4.3.orig HOSTCXX=gcc-4.3-mine
Depending on your configuration, there are some targets you can use to
use menuconfig of certain packages. This includes:
$ make HOSTCC=gcc-4.3 linux-menuconfig
$ make HOSTCC=gcc-4.3 uclibc-menuconfig
$ make HOSTCC=gcc-4.3 busybox-menuconfig
Please feed suggestions, bug reports, insults, and bribes back to the
buildroot mailing list: buildroot@uclibc.org