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Currently, we override @D for the kconfig configurators, so the fixup commands can use $(@D); otherwise @D would be simply '.' because it is not a real file in the package build dir. However, this breaks the soon-to-be-introduced linux-backports package, which needs to have a dependency on the linux package to be configured. The underlying reason is that @D is an automatic variable that is always set by make to the directory part of the target of the rule. However, automatic variables loose their "automatic" property when they are manually set. Furthermore, a variable that is defined for a rule is inherited by all dependencies of that rule, so our manually-set @D is inherited all the way down the dependency chain of linux-backports, down to the linux' own .config rule, which is thus run with @D pointing to linux-backports' build dir, not linux'. Fix that by using a "static pattern rule", redirecting the configurators to an intermediate stamp-like file which path is in the package build dir, so we get a valid @D from the onset, without having to manually fiddle with it. Thanks to Arnout for suggesting that in the first place. Sorry I did reject it as "too complex" when it was in fact the best solution. Suggested-by: Arnout Vandecappelle <arnout@mind.be> Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Arnout Vandecappelle <arnout@mind.be> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Thomas De Schampheleire <patrickdepinguin@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.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.