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Some toolchains used in Buildroot (x86-64 and mips64) have a problem to compile a set of object files into one object file as it is done for the `builtin-target` declared in swupdate's Kbuild Makefile.build. This target collects all object files from every subdirectory declared in `objs-dir` and compiles them into a single object file named `build-in.o` using the linker ld. For the addressed toolchains the default emulation of ld is not the correct one leading to different kind of relocation errors: /usr/bin/i686-pc-linux-gnu-ld: Relocatable linking with relocations from format elf64-x86-64 (core/swupdate.o) to format elf32-i386 (core/built-in.o) is not supported. or /usr/bin/mips-linux-gnu-ld: handlers/raw_handler.o: endianness incompatible with that of the selected emulation or /usr/bin/mips64el-linux-ld: core/swupdate.o: ABI is incompatible with that of the selected As there is no need to have single object file `built-in.o` to be compiled for the subdirectories core and handlers we can easily allow swupdate to be built with these toolchains by compiling the source files from core and handlers with the `lib-target` target by assigning them to the `libs-y` variable as it is done for all other subdirectories. The `lib-target` compiles a set of object files into one archive file. With this target we avoid using the ld linker and use the ar archiver instead. Add a patch from upstream to fix a whole bunch of autobuild errors. Fixes: http://autobuild.buildroot.net/results/de9/de920298075d32f3de83a0cfb7417846eb833425/ http://autobuild.buildroot.net/results/975/975915aa33005806e78260bae385cd4b3e359ca8/ http://autobuild.buildroot.net/results/c54/c54e7a2ea353d95d41a1e966de0dffa7b6ac432e/ http://autobuild.buildroot.net/results/019/0198596ebfed05ab86552b628da2274d55bf42ae/ and many more. Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks> 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.