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da60753a43
This commit brings a number of improvements to the grub packaging: * It builds grub with the host compiler, which is needed so that we can build a 32 bits grub even if the target architecture is x86-64. To make sure we have a host compiler capable of generating 32 bits code, grub now selects the BR2_HOSTARCH_NEEDS_IA32_COMPILER option. Building with the host compiler is done by cheating and passing $(HOST_CONFIGURE_OPTS) in GRUB_CONF_ENV. * Some additional CFLAGS are added to make sure grub builds properly with modern compilers (-O0, --build-id=none, -fno-stack-protector). * Removal of the GRUB_INSTALL_STAGING_CMDS which were not used, since GRUB_INSTALL_STAGING was not set to YES. * Installation of the "grub" binary in $(HOST_DIR) instead of $(TARGET_DIR) since it's actually used only on the host to install grub into an image or device. * Removal of the grub uninstall commands, since they are generally considered useless. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.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