1.4.7-3 defines (header) but doesn't export some functions

[Christian Ehrhardt ]

libfdt 1.4.7-3 as currently in C/D/E defines some functions that it then fails to export.
Due to that programs build against its headers might fail later on.

For example qemu:
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 - so it should be rather SRU safe.

We haven't seen this in the wild because almost no project has yet picked up to use the new function.
Hence I'm not sure we really need SRUs, but for Eoan and forward we will need that as e.g. qemu did so in [2] and therfore is FTBFS without the fix. Over the time more projects might be like that so lets fix it in Eoan (and not the others) for now.

[1]: https://github.com/dgibson/dtc/commit/eac2ad495b29f15d78daa2a7226653f36515cd7a
[2]: https://git.qemu.org/?p=qemu.git;a=commit;h=fea35ca4b8e68b4fae5df7a13d8f300d9abfb40a

[Christian Ehrhardt  (paelzer)]

FYI: No Debian bug needed as 1.5 (with fix) is already waiting in experimental for post-Buster.

[Christian Ehrhardt  (paelzer)]

I have already built and tested this change in a PPA last week for other reasons, so I think this is an exception and insta-ready for an upload to Eoan.

[Christian Ehrhardt  (paelzer)]

Well other than expected this even came after 1.5 so let me file a Debian bug as well.

[Launchpad Janitor (janitor)]

This bug was fixed in the package device-tree-compiler - 1.4.7-3ubuntu2

---------------
device-tree-compiler (1.4.7-3ubuntu2) eoan; urgency=medium

  * d/control: run update maintainer that was forgotten on the former upload,
    but required when deriving from Debian.

 -- Christian Ehrhardt <email address hidden> Tue, 25 Jun 2019 09:54:00 +0200