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Currently the host build of Python 2 defaults to narrow unicode (UCS2), ignoring the BR2_PACKAGE_PYTHON_UCS4 configuration option which may be set to wide (UCS4). This results in host and target Python packages which are incompatible in subtle ways. For example, installing wheels into the target fails when they are made with the host python, citing incompatibility (as can be seen by the package tags which may be "cp27u-manylinux1" instead of "cp27mu-manylinux1"). Compiling the host Python 2 with the same UCS configuration as the target ensures that the packages are compatible (and the tags match). This does not affect Python 3 as support for narrow unicode was deprecated in version 3.3, see https://www.python.org/dev/peps/pep-0393/ Thanks to Tony Breeds <tony@bakeyournoodle.com> for reporting this. Signed-off-by: Chris Smart <mail@csmart.io> [Thomas: add comment in the code.] 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