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zlib-ng usage uses CMAKE_C_COMPILER_TARGET which is non-standard and is not supposed to be used by the CMakeLists.txt machinery of a particular package. Indeed, [1] specifies that: Some compiler drivers are inherently cross-compilers, such as clang and QNX qcc. These compiler drivers support a command-line argument to specify the target to cross-compile for. buildroot is not using clang nor QNX qcc. [2] also refers to this variable only for clang [3] and QNX [4]. Therefore, zlib-ng's usage of this variable is a bit of a hack, and it's actually why it works when passed as an argument, because they are in fact not supposed to use this variable. So set CMAKE_C_COMPILER_TARGET to BR2_ARCH to fix the following arm build failure raised since bump to version 2.0.6 in commitd2249821d3: -- Detecting C compile features - done -- Arch not recognized, falling back to cmake arch: 'l' -- Basearch 'l' not recognized, defaulting to 'x86'. -- Basearch of 'l' has been detected as: 'x86' [...] /home/buildroot/autobuild/instance-0/output-1/build/zlib-ng-2.1.3/arch/x86/x86_features.c:17:12: fatal error: cpuid.h: No such file or directory 17 | # include <cpuid.h> | ^~~~~~~~~ [1] https://cmake.org/cmake/help/latest/variable/CMAKE_LANG_COMPILER_TARGET.html [2] https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html [3] https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html#cross-compiling-using-clang [4] https://cmake.org/cmake/help/latest/manual/cmake-toolchains.7.html#cross-compiling-for-qnx Fixes:d2249821d3- http://autobuild.buildroot.org/results/1551aa69be19239a8d8e081f033e4027d679ab8f - http://autobuild.buildroot.org/results/075d704c0f11710353bac43478e4501addcd747d Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr> (cherry picked from commit900bd80e9b) Signed-off-by: Peter Korsgaard <peter@korsgaard.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 OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches