gtk+3.0: FTBFS: dpkg-gensymbols: error: some new symbols appeared in the symbols file: see diff output below

[Norbert]

apt-get source -b libgtk-3-dev
Reading package lists... Done
Picking 'gtk+3.0' as source package instead of 'libgtk-3-dev'
NOTICE: 'gtk+3.0' packaging is maintained in the 'Git' version control system at:
https://salsa.debian.org/gnome-team/gtk3.git -b ubuntu/focal
Please use:
git clone https://salsa.debian.org/gnome-team/gtk3.git -b ubuntu/focal
to retrieve the latest (possibly unreleased) updates to the package.
Need to get 22.9 MB of source archives.
Get:1 http://archive.ubuntu.com/ubuntu focal-updates/main gtk+3.0 3.24.20-0ubuntu1 (dsc) [3,639 B]
Get:2 http://archive.ubuntu.com/ubuntu focal-updates/main gtk+3.0 3.24.20-0ubuntu1 (tar) [22.7 MB]
Get:3 http://archive.ubuntu.com/ubuntu focal-updates/main gtk+3.0 3.24.20-0ubuntu1 (diff) [171 kB]
Fetched 22.9 MB in 28s (815 kB/s)
dpkg-source: info: extracting gtk+3.0 in gtk+3.0-3.24.20
dpkg-source: info: unpacking gtk+3.0_3.24.20.orig.tar.xz
dpkg-source: info: unpacking gtk+3.0_3.24.20-0ubuntu1.debian.tar.xz
dpkg-source: info: using patch list from debian/patches/series

...

dwz: debian/libgtk-3-0/usr/lib/x86_64-linux-gnu/libgtk-3.so.0.2404.16: DWARF compression not beneficial - old size 8243658 new size 8376050
   dh_strip -O--buildsystem=autoconf
   debian/rules override_dh_makeshlibs
make[1]: Entering directory '/root/gtk+3.0-3.24.20'
sed: couldn't write 35 items to stdout: Broken pipe
dh_makeshlibs -plibgtk-3-0 --add-udeb=libgtk-3-0-udeb -Xusr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0 -- -c4
dpkg-gensymbols: error: some new symbols appeared in the symbols file: see diff output below
dpkg-gensymbols: warning: debian/libgtk-3-0/DEBIAN/symbols doesn't match completely debian/libgtk-3-0.symbols
--- debian/libgtk-3-0.symbols (libgtk-3-0_3.24.20-0ubuntu1_amd64)
+++ dpkg-gensymbolsrezAkY 2022-01-04 20:54:52.551202248 +0000
@@ -1,5 +1,8 @@
 libgdk-3.so.0 libgtk-3-0 #MINVER#
 * Build-Depends-Package: libgtk-3-dev
+ _gdk_get_resource@Base 3.24.20-0ubuntu1
+ _gdk_register_resource@Base 3.24.20-0ubuntu1
+ _gdk_unregister_resource@Base 3.24.20-0ubuntu1
  gdk__private__@Base 3.16.2
  gdk_add_option_entries_libgtk_only@Base 3.0.0
  gdk_anchor_hints_get_type@Base 3.21.5
@@ -758,6 +761,9 @@
  gdk_x11_xatom_to_atom@Base 3.0.0
  gdk_x11_xatom_to_atom_for_display@Base 3.0.0
 libgtk-3.so.0 libgtk-3-0 #MINVER#
+ _gtk_get_resource@Base 3.24.20-0ubuntu1
+ _gtk_register_resource@Base 3.24.20-0ubuntu1
+ _gtk_unregister_resource@Base 3.24.20-0ubuntu1
  gtk_about_dialog_add_credit_section@Base 3.3.16
  gtk_about_dialog_get_artists@Base 3.0.0
  gtk_about_dialog_get_authors@Base 3.0.0
dh_makeshlibs: error: failing due to earlier errors
make[1]: *** [debian/rules:243: override_dh_makeshlibs] Error 2
make[1]: Leaving directory '/root/gtk+3.0-3.24.20'
make: *** [debian/rules:135: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2
W: Download is performed unsandboxed as root as file 'gtk+3.0_3.24.20-0ubuntu1.dsc' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)
E: Build command 'cd gtk+3.0-3.24.20 && dpkg-buildpackage -b -uc' failed.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: libgtk-3-dev (not installed)
ProcVersionSignature: Ubuntu 5.4.0-92.103-generic 5.4.157
Uname: Linux 5.4.0-92-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: MATE
Date: Wed Jan 5 00:02:06 2022
InstallationDate: Installed on 2020-04-23 (621 days ago)
InstallationMedia: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: gtk+3.0
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "build-Don-t-export-GResource-related-symbols-with-newer-G.patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Norbert (nrbrtx)]

To reproduce run:

docker run -it --rm ubuntu:focal bash -c "sed -i 's/# deb-src/deb-src/g' /etc/apt/sources.list; apt-get update; apt-get dist-upgrade -y; apt-get build-dep libgtk-3-dev -y; apt-get source -b libgtk-3-dev"

[Sebastien Bacher (seb128)]

The issue is fixed in the current version