fc34cf772c
This unique NAME is used to construct a per br2-external tree variable, BR2_EXTERNAL_$(NAME)_PATH, which contains the path to the br2-external tree. This variable is available both from Kconfig (set in the Kconfig snippet) and from the .mk files. Also, display the NAME and its path as a comment in the menuconfig. This will ultimately allow us to support multiple br2-external trees at once, with that NAME (and thus BR2_EXTERNAL_$(NAME)) uniquely defining which br2-external tree is being used. The obvious outcome is that BR2_EXTERNAL should now no longer be used to refer to the files in the br2-external tree; that location is now known from the BR2_EXTERNAL_$(NAME)_PATH variable instead. This means we no longer need to expose, and must stop from from exposing BR2_EXTERNAL as a Kconfig variable. Finally, this also fixes a latent bug in the pkg-generic infra, where we would so far always refer to BR2_EXTERNAL (even if not set) to filter the names of packages (to decide whether they are a bootloader, a toolchain or a simple package). Note: since the variables in the Makefile and in Kconfig are named the same, the one we computed early on in the Makefile will be overridden by the one in .config when we have it. Thus, even though they are set to the same raw value, the one from .config is quoted and, being included later in the Makefile, will take precedence, so we just re-include the generated Makefile fragment a third time before includeing the br2-external's Makefiles. That's unfortunate, but there is no easy way around that as we do want the two variables to be named the same in Makefile and Kconfig (and we can't ask the user to un-quote that variable himself either), hence this little dirty triple-inclusion trick. Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Arnout Vandecappelle <arnout@mind.be> Cc: Romain Naour <romain.naour@openwide.fr> Signed-off-by: Peter Korsgaard <peter@korsgaard.com> |
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| arch | ||
| board | ||
| boot | ||
| configs | ||
| docs | ||
| fs | ||
| linux | ||
| package | ||
| support | ||
| system | ||
| toolchain | ||
| .defconfig | ||
| .gitignore | ||
| CHANGES | ||
| Config.in | ||
| Config.in.legacy | ||
| COPYING | ||
| DEVELOPERS | ||
| Makefile | ||
| Makefile.legacy | ||
| README | ||
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. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches