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In Buildroot, the selection of a package from a Config.in level and from a Makefile level are completely disconnected. This can lead to issues where the build of a package is triggered at the Makefile level due to the package being listed in another package <pkg>_DEPENDENCIES variable, even if that package is not enabled in the configuration. This has for example been the case recently with python-can having 'python' in its <pkg>_DEPENDENCIES, while python-can could be enabled when Python 3.x is used, in which case the 'python' package should not be built. To detect such issues more easily, this patch adds a check in the package infrastructure. When the build process of a package is being triggered, we verify that the package is enabled in the configuration. We do this check in the "configure" step, since this step is the first common step between the normal download case and the "local site method" / "package override" case. [Thomas: adjust the error message as suggested by Yann, to take into account the fact that the problem might not be in a direct reverse dependency, but in something higher up in the tree of reverse dependencies.] 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.