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The webrtc-audio-processing configure script assumes that if the host_cpu part of the tuple is "arm", then ARM instructions are available. This is obviously incorrect for ARM Cortex-M platforms, which only support the Thumb-2 instruction set. In order to address this, we add a patch, 0001-configure.ac-fix-architecture-detection.patch, which changes how webrtc-audio-processing detects the architecture: instead of relying on the host_cpu part of the tuple, it relies on the built-in definitions of the compiler. Not only it fixes the Cortex-M detection, but it also enables ARMv7 optimizations on ARMv7-A: until now they were only enabled when the host_cpu part of the tuple was armv7, which is never the case in Buildroot. However, once this issue is fixed for Cortex-M, the build nonetheless fails later due to the usage of NPTL-only functions. So we change the thread dependency to a NPTL dependency. Fixes: http://autobuild.buildroot.net/results/4933082cd7cc5781404c77ccef5c2b9333c5f714/ 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