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host-erlang build can fail with the following error: make[5]: Nothing to be done for 'opt'. MAKE opt CC ../priv/bin/x86_64-pc-linux-gnu/odbcserver /usr/bin/ld: ../priv/obj/x86_64-pc-linux-gnu/odbcserver.o: in function `encode_column_dyn': odbcserver.c:(.text+0x6b4): undefined reference to `ei_x_encode_tuple_header' /usr/bin/ld: odbcserver.c:(.text+0x6c2): undefined reference to `ei_x_encode_tuple_header' /usr/bin/ld: odbcserver.c:(.text+0x6d4): undefined reference to `ei_x_encode_ulong' /usr/bin/ld: odbcserver.c:(.text+0x6e7): undefined reference to `ei_x_encode_ulong' /usr/bin/ld: odbcserver.c:(.text+0x6fa): undefined reference to `ei_x_encode_ulong' /usr/bin/ld: odbcserver.c:(.text+0x708): undefined reference to `ei_x_encode_tuple_header' /usr/bin/ld: odbcserver.c:(.text+0x71b): undefined reference to `ei_x_encode_ulong' /usr/bin/ld: odbcserver.c:(.text+0x72e): undefined reference to `ei_x_encode_ulong' [...] This can be reproduced with the following minimal defconfig (and libei.so present on host, see details below): BR2_x86_64=y BR2_TOOLCHAIN_EXTERNAL=y BR2_PACKAGE_ERLANG=y Those missing symbols are part of the erl_interface, exposed by libei.a. host-erlang builds correctly libei.a _before_ odbcserver.c (it can be found in lib/erl_interface/obj/x86_64-pc-linux-gnu/libei.a), but the failure is actually due to the build command generated and used for odbcserver.c, especially the link arguments: /usr/bin/gcc \ [...] -o ../priv/bin/x86_64-pc-linux-gnu/odbcserver \ ../priv/obj/x86_64-pc-linux-gnu/odbcserver.o \ -L/usr/lib64 \ -lodbc \ -L/home/alexis/src/buildroot/erlang-master/build/host-erlang-custom/lib/erl_interface/obj/x86_64-pc-linux-gnu \ -lpthread -lei /usr/lib64 is searched before the path where libei.a has been built, so if whether a valid libei.a or libei.so is found there, it shadows the expected libei.a. In the build from which the logs above come, the notable point is that the host system indeed have a valid libei.so, but is completely unrelated to erl_interface; it rather exposes the Emulated Input protocol aimed at Wayland stack; and so it obviously contains none of the expected ei_* symbols. Upstream has already identified and fixed the issue, the fix is already released in versions >= 27.x.y. Erlang 26 (the version currently packaged in buildroot), isn't supported anymore (only the three latest releases are supported, see https://github.com/erlang/otp/blob/master/SECURITY.md), so there won't be any new minor update that will release this fix. Pick and backport the fixing patch so that the current version packaged in buildroot can still build. Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.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 https://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