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printvars returns nothing when VARS is not passed or empty. This is done on purpose, see commitfd5bd12379("Makefile: printvars: don't print anything when VARS is not set"). An error message making explicit what is required from the user in order to use printvars is however better than silently doing nothing. This adds a check for a non-empty VARS variable. Cc: Quentin Schulz <foss+buildroot@0leil.net> Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr> (cherry picked from commitec82347cde) 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 OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches