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The pixman ARM optimized code assumes that ARM instructions are available. Unfortunately, the configure.ac checks do not detect that the platform is Thumb-only for Cortex-M builds, so it enables the ARM optimizations, leading to failures like: error: /home/test/autobuild/run/instance-3/output/host/usr/arm-buildroot-uclinux-uclibcgnueabi/sysroot/usr/lib/libpixman-1.a(pixman-arm-simd-asm-scaled.o): Conflicting CPU architectures 13/1 When building programs linked with pixman on Thumb-only architectures. This is due to the fact that some object files in libpixman-1.a are built for the ARM instruction set. To resolve this, we give better hints to the pixman configure script about which ARM optimizations to use: the ARM SIMD optimizations need at least a CPU that supports ARM instructions, and obviously the ARM NEON optimizations need NEON support. Fixes: http://autobuild.buildroot.net/results/54bee2ce382fcd067965d30f758f9d15514478d9/ Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> [Thomas: add a comment above the --enable-arm-simd option, as suggested by Arnout.] 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. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches