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When BR2_OPTIMIZE_0, -O0 is passed in compiler CFLAGS. This means no code optimization will be performed. kexec code uses a trick to detect unaligned accesses at link time which needs at least dead-code-removal to work. See put/get_unaligned() macros in kexec/kexec.h. This code was re-enabled in upstream commit [1]. This commit sets at least -O1 (which include the sufficient dead-code-removal) when BR2_OPTIMIZE_0=y, to fix those issues. Fixes: - http://autobuild.buildroot.org/results/8f8/8f8532f1dfbd71e52c51c00118934af9fa45e7cb - http://autobuild.buildroot.org/results/528/528fd7baf9b0ad5549d22ec8e0623c5fa1f2d117 - http://autobuild.buildroot.org/results/499/499115439680adfb4b40042468e5bbb65d91ce6c - ...and many others [1] https://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git/commit/?id=0723defb5308ac7fce296f8b596bff4df6803f01 Signed-off-by: Julien Olivain <ju.o@free.fr> Signed-off-by: Arnout Vandecappelle <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 OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches