package: device-tree-compiler version: 1.5.0-1 libfdt 1.4.7-3 and 1.5.0-1 currently define some functions that it then fails to export. Due to that programs build against its headers might fail later on.
For example qemu 4.0: cc -pthread -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -pthread -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -fPIE -DPIE -m64 -mcx16 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv -std=gnu99 -g -O2 -fdebug-prefix-map=/<<BUILDDIR>>/qemu-4.0+dfsg=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -Wexpansion-to-defined -Wendif-labels -Wno-shift-negative-value -Wno-missing-include-dirs -Wempty-body -Wnested-externs -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wold-style-declaration -Wold-style-definition -Wtype-limits -fstack-protector-strong -I/usr/include/p11-kit-1 -I/usr/include/libpng16 -o config-temp/qemu-conf.exe config-temp/qemu-conf.c -Wl,-z,relro -Wl,-z,now -pie -m64 -g -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,--as-needed -lfdt /usr/bin/ld: /tmp/cck74tTE.o: in function `main': ./b/qemu/config-temp/qemu-conf.c:3: undefined reference to `fdt_check_full' A fix to that is already upstream [1] and should be an easy backport that also "only" adds symbols but that is up to you. We haven't seen this in the wild because almost no project has yet picked up to use the new function. For example qemu did so in [2] and therefore will be FTBFS without the fix. Over the time more projects might be like that so lets fix it if it looks ok for you. I don't think it is a big issue for Buster, as other SW didn't pick these up yet. I have done the same [3] for Ubuntu already to work on qemu, but after I realized that even 1.5 in debian/experimental doesn't have the fix yet I thought I give you a ping as well to be aware. [1]: https://github.com/dgibson/dtc/commit/eac2ad495b29f15d78daa2a7226653f36515cd7a [2]: https://git.qemu.org/?p=qemu.git;a=commit;h=fea35ca4b8e68b4fae5df7a13d8f300d9abfb40a [3]: https://bugs.launchpad.net/ubuntu/+source/device-tree-compiler/+bug/1834143 -- Christian Ehrhardt Software Engineer, Ubuntu Server Canonical Ltd
