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The iozone code uses the pthread_setaffinity_np() function, but with uClibc this function is only available when the NPTL thread implementation is used. Some architectures, such as AVR32 and ARC do not support the NPTL thread implementation, and therefore lack the pthread_setaffinity_np() function. This commit adds a patch that provides an empty implementation of pthread_setaffinity_np() when we're using uClibc, but not with the NPTL thread implementation. The reasoning is that there is a very high chance that the few architectures that do not implement NPTL are non-SMP architectures, and therefore setting the affinity is not very useful. In addition to this, this commit: * Renames the existing patch to use a sequence number, in order to guarantee a proper ordering when applying patches. * Removes the Kconfig dependency on !uClibc 0.9.31, which was introduced to prevent AVR32 from failing due to the pthread_setaffinity_np(). This conditional is no longer necessary due to the new patch, and the conditional was anyway not completely working since it was not taking into account the case of external toolchains. 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