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Yann E. MORIN 0ea851c0c0 core: do not accept multiple definitions of a package
One of the selling points for br2-external is to provide a mean to add
new packages. However, it is not supported that a package be defined by
Buildroot and then redefined in a br2-external tree.

This situation may occur without the user noticing or even willing to
redefine the package, for example:
  - br2-external is first created against a version of Buildroot
  - a package (missing in Buildroot) is added to that br2-external tree
  - upstream Buildroot adds this package
  - user updates to the new Buildroot

In this case, the result in undefined, and we can't make any guarantee
on the result (working or not).

Add a sanity check so that a package redefinition gets caught.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Peter Korsgaard <jacmet@uclibc.org>
Cc: Arnout Vandecappelle <arnout@mind.be>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Reviewed-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
2015-11-03 23:41:11 +01:00
arch arch/arm: use EABIhf by default with VFP 2015-10-25 19:56:20 +01:00
board configs/mpc8315erdb: bump to linux 4.2.5 2015-10-29 19:56:43 +01:00
boot uboot: fix hash for 2015.10 version 2015-10-28 23:40:17 +01:00
configs configs/mpc8315erdb: bump to linux 4.2.5 2015-10-29 19:56:43 +01:00
docs core/pkg-generic: allow packages to exclude files when extracting 2015-11-03 22:20:30 +01:00
fs fs/ext2: add options for extra space and extra inodes 2015-10-31 15:56:56 +01:00
linux linux: bump default version to 4.3 2015-11-02 20:56:43 +01:00
package core: do not accept multiple definitions of a package 2015-11-03 23:41:11 +01:00
support Makefile: Remove 'quiet' variable 2015-10-29 00:04:05 +01:00
system skeleton: optionally wait for network interfaces to appear 2015-11-02 16:51:47 +01:00
toolchain toolchain/external: use generic extract commands (blackfin case) 2015-11-03 22:32:03 +01:00
.defconfig arch: kill avr32 2015-02-14 17:39:50 +01:00
.gitignore update gitignore 2013-05-04 12:41:55 +02:00
CHANGES Update for 2015.08 2015-08-31 23:06:58 +02:00
Config.in ccache: support changing the output directory 2015-10-04 18:22:21 +02:00
Config.in.legacy gst1-plugins-bad: update configure options 2015-10-21 23:36:37 +02:00
COPYING
Makefile core: do not accept multiple definitions of a package 2015-11-03 23:41:11 +01:00
Makefile.legacy Makefile.legacy: fix recursive invocation with BUILDROOT_DL_DIR and _CONFIG 2014-02-11 08:14:57 +01:00
README README: mention 'make list-defconfigs' 2015-04-04 15:19:43 +02:00

Buildroot is a simple, efficient and easy-to-use tool to generate embedded
Linux systems through cross-compilation.

The documentation can be found in docs/manual. You can generate a text
document with 'make manual-text' and read output/docs/manual/manual.text.
Online documentation can be found at http://buildroot.org/docs.html

To build and use the buildroot stuff, do the following:

1) run 'make menuconfig'
2) select the target architecture and the packages you wish to compile
3) run 'make'
4) wait while it compiles
5) find the kernel, bootloader, root filesystem, etc. in output/images

You do not need to be root to build or run buildroot.  Have fun!

Buildroot comes with a basic configuration for a number of boards. Run
'make list-defconfigs' to view the list of provided configurations.

Please feed suggestions, bug reports, insults, and bribes back to the
buildroot mailing list: buildroot@buildroot.org
You can also find us on #buildroot on Freenode IRC.