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The CodeSourcery toolchains have a very interesting feature: they warn the user when an unsafe header or library path is used, i.e a path that will lead host headers or libraries to leak into the build. This commit adds a similar functionality into our external toolchain wrapper, so that it can be used with all external toolchains, and can also be tuned as needed. By default, the external toolchain wrapper now gives warnings such as: arm-linux-gcc: WARNING: unsafe header/library path used in cross-compilation: '-I /usr/foo' arm-linux-gcc: WARNING: unsafe header/library path used in cross-compilation: '-L /usr/bleh' but the compilation continues successfully. One can then easily grep in his build log to search for occurences of this message. Optionally, if BR_COMPILER_PARANOID_UNSAFE_PATH is defined in the environment to a non empty value, the external wrapper will instead error out and abort the compilation. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: Romain Naour <romain.naour@openwide.fr> Tested-by: Romain Naour <romain.naour@openwide.fr>
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@buildroot.org