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gcc 7 with -Os (optimize for size) takes the liberty to remove the code of inline functions entirely - which is indeed allowed according to the C99 standard, cfr. this [1] very complete StackOverflow answer. This leads to undefined function references at link time. The proper approach is to patch the code to use 'static inline' instead. However, for various reasons such a patch is not entirely trivial, and upstream has not moved since 7 years, so instead take the simpler approach of restoring the gcc original inline behaviour with -fgnu89-inline to fix this issue. Fixes http://autobuild.buildroot.org/results/d72/d72a7e9775a10bc884b9953dd2eba3ad32100cca [1] https://stackoverflow.com/questions/6312597/is-inline-without-static-or-extern-ever-useful-in-c99 Signed-off-by: Francois Perrad <francois.perrad@gadz.org> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
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