gtkmm3.0 ftbfs in focal

[Matthias Klose]

seen in a focal test rebuild, all architctures:
https://launchpad.net/ubuntu/+archive/test-rebuild-20200810-focal/+build/19795016

g++ -std=c++11 -DHAVE_CONFIG_H -I.. -I../gdk -I../gtk -pthread -pthread -I/usr/include/atkmm-1.6 -I/usr/include/giomm-2.4 -I/usr/lib/x86_64-linux-gnu/giomm-2.4/include -I/usr/include/pangomm-1.4 -I/usr/lib/x86_64-linux-gnu/pangomm-1.4/include -I/usr/include/glibmm-2.4 -I/usr/lib/x86_64-linux-gnu/glibmm-2.4/include -I/usr/include/cairomm-1.0 -I/usr/lib/x86_64-linux-gnu/cairomm-1.0/include -I/usr/include/sigc++-2.0 -I/usr/lib/x86_64-linux-gnu/sigc++-2.0/include -I/usr/include/gtk-3.0/unix-print -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/x86_64-linux-gnu/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/harfbuzz -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -DDEMOCODEDIR=\"""\" -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -DGLIBMM_DISABLE_DEPRECATED -DGIOMM_DISABLE_DEPRECATED -DGTKMM_DISABLE_DEPRECATED -DGDKMM_DISABLE_DEPRECATED -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -c -o gtk-demo/gtkmm_demo-example_appwindow.o `test -f 'gtk-demo/example_appwindow.cc' || echo './'`gtk-demo/example_appwindow.cc
gtk-demo/demowindow.cc:54:1: error: ‘demo_columns’ function uses ‘auto’ type specifier without trailing return type
   54 | const auto& demo_columns()
      | ^~~~~
gtk-demo/demowindow.cc:54:1: note: deduced return type only available with ‘-std=c++14’ or ‘-std=gnu++14’
make[4]: *** [Makefile:733: gtk-demo/gtkmm_demo-demowindow.o] Error 1
make[4]: *** Waiting for unfinished jobs....

[Sebastien Bacher (seb128)]

Upstream fix in https://gitlab.gnome.org/GNOME/gtkmm/-/commit/60be3fa8 , it's weird it didn't fail in the G archive rebuild though

[Matthias Klose (doko)]

groovy already uses GCC 10

[Brian Murray (brian-murray)]

Hello Matthias, or anyone else affected,

Accepted gtkmm3.0 into focal-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/gtkmm3.0/3.24.2-1ubuntu0.1 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-focal to verification-done-focal. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-focal. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Brian Murray (brian-murray)]

The fix for this bug has been awaiting testing feedback in the -proposed repository for focal for more than 90 days. Please test this fix and update the bug appropriately with the results. In the event that the fix for this bug is still not verified 15 days from now, the package will be removed from the -proposed repository.

[Sebastien Bacher (seb128)]

setting as verified since it built as expected