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Extract dependencies are dependencies that must be ready before the extract step of a package, i.e for tools that are needed to extract packages themselves. Current examples of such tools are host-tar, host-lzip and host-xz. They are currently handled through DEPENDENCIES_HOST_PREREQ. However, this mechanism has a number of drawbacks: - First and foremost, because host-tar/host-lzip/host-xz are not listed in the dependencies of packages, the package infrastructure does not know it should rsync them in the context of per-package SDK. - Second, there is no dependency handling *between* them. I.e, we have no mechanism that says host-tar should be built before host-lzip, while it is in fact the case: if you need to build host-lzip, you need to extract a tarball, so you may need host-tar if your system tarball is not capable enough. For those reasons, it makes sense to add explicit support for "extract dependencies" in the package infrastructure, through the <pkg>_EXTRACT_DEPENDENCIES variable. It is unlikely this variable will ever be used by a package .mk file, but it will be used internally by the package infrastructure. [Peter: fix typo in manual] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Tested-by: Matt Weber <matthew.weber@rockwellcollins.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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