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BR2_GCC_ENABLE_LTO only enables LTO in the toolchain, not in packages. Use BR2_ENABLE_LTO instead to enable it in packages as well. Note that BR2_GCC_ENABLE_LTO is currently non-functional (LTO is still enabled in the toolchain even if it's not set), so we *do* have LTO available in the toolchain. Note that the option has no effect at all on these defconfigs anyway, since they don't contain any package that is affected by the BR2_ENABLE_LTO option. Still, it makes sense to enable it for these really memory-constrained targets for when packages are added. Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.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