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When building a toolchain with upstream gcc 9.x the build fail due to several issues. Note: The upstream Binutils support csky target since release 2.32 but the support was never enabled in the Buildroot packaging. So the latest version (2.33.1) was tested here. [upstream gcc 9.x w/ glibc csky fork with binutils csky for or binutils 2.33.1] In file included from <command-line>: ./../include/libc-symbols.h:534:26: error: '__EI___errno_location' specifies less restrictive attributes than its target '__errno_location': 'const', 'nothrow' [-Werror=missing-attributes] 534 | extern __typeof (name) __EI_##name \ [upstream gcc 9.x w/ glibc 2.30 w/ binutils csky fork] /tmp/ccThLRhb.s: Assembler messages: /tmp/ccThLRhb.s:10: Error: invalid or unsupported encoding in .cfi_personality /tmp/ccThLRhb.s:11: Error: invalid or unsupported encoding in .cfi_lsda [upstream gcc 9.x w/ glibc 2.30 w/ binutils 2.33.1] build/elf/librtld.os: in function `__sync_fetch_and_add_2': libgcc/config/csky/linux-atomic.c:116: undefined reference to `__kernel_cmpxchg' Currenlty, only the toolchain using binutils, gcc, glibc fork produce a working toolchain. So disable gcc 9.x for csky. Signed-off-by: Romain Naour <romain.naour@smile.fr> Cc: Yann E. MORIN <yann.morin.1998@free.fr> Cc: Guo Ren <guoren@kernel.org> Cc: Arnout Vandecappelle <arnout@mind.be> Cc: Peter Korsgaard <peter@korsgaard.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.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