Build failure on Fedora Rawhide

[funnelfiasco]

Version, Operating system
Building cherrytree v1.7.1 fails on all Fedora Rawhide (future F45) architectures. The same SRPM builds successfully on Fedora Linux 43 & 44.

Describe the bug

Errors from the build log (notes and warnings skipped):

In file included from /usr/include/giomm-2.4/giomm.h:44,
                 from /usr/include/gtkmm-3.0/gtkmm.h:99,
                 from /builddir/build/BUILD/cherrytree-future-1.7.1-build/cherrytree-1.7.1/src/ct/ct_main_win.h:31,
                 from /builddir/build/BUILD/cherrytree-future-1.7.1-build/cherrytree-1.7.1/src/ct/ct_actions.h:26,
                 from /builddir/build/BUILD/cherrytree-future-1.7.1-build/cherrytree-1.7.1/src/ct/ct_actions_edit.cc:24:
/usr/include/giomm-2.4/giomm/dbusactiongroup.h:32:7: error: conflicting declaration ‘using GDBusActionGroupClass = struct _GDBusActionGroupClass’
   32 | using GDBusActionGroupClass = struct _GDBusActionGroupClass;
      |       ^~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/giomm-2.4/giomm.h:44,
                 from /usr/include/gtkmm-3.0/gtkmm.h:99,
                 from /builddir/build/BUILD/cherrytree-future-1.7.1-build/cherrytree-1.7.1/src/ct/ct_main_win.h:31,
                 from /builddir/build/BUILD/cherrytree-future-1.7.1-build/cherrytree-1.7.1/src/ct/ct_actions.h:26,
                 from /builddir/build/BUILD/cherrytree-future-1.7.1-build/cherrytree-1.7.1/src/ct/ct_actions_file.cc:24:
/usr/include/giomm-2.4/giomm/dbusactiongroup.h:32:7: error: conflicting declaration ‘using GDBusActionGroupClass = struct _GDBusActionGroupClass’
   32 | using GDBusActionGroupClass = struct _GDBusActionGroupClass;
      |       ^~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/giomm-2.4/giomm.h:73:
/usr/include/giomm-2.4/giomm/emblem.h:31:7: error: conflicting declaration ‘using GEmblemClass = struct _GEmblemClass’
   31 | using GEmblemClass = struct _GEmblemClass;
      |       ^~~~~~~~~~~~
In file included from /usr/include/giomm-2.4/giomm.h:44,
                 from /usr/include/gtkmm-3.0/gtkmm.h:99,
                 from /builddir/build/BUILD/cherrytree-future-1.7.1-build/cherrytree-1.7.1/src/ct/ct_main_win.h:31,
                 from /builddir/build/BUILD/cherrytree-future-1.7.1-build/cherrytree-1.7.1/src/ct/ct_actions.h:26,
                 from /builddir/build/BUILD/cherrytree-future-1.7.1-build/cherrytree-1.7.1/src/ct/ct_actions_export.cc:24:
/usr/include/giomm-2.4/giomm/dbusactiongroup.h:32:7: error: conflicting declaration ‘using GDBusActionGroupClass = struct _GDBusActionGroupClass’
   32 | using GDBusActionGroupClass = struct _GDBusActionGroupClass;
      |       ^~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/giomm-2.4/giomm.h:73:
/usr/include/giomm-2.4/giomm/emblem.h:31:7: error: conflicting declaration ‘using GEmblemClass = struct _GEmblemClass’
   31 | using GEmblemClass = struct _GEmblemClass;
      |       ^~~~~~~~~~~~
In file included from /usr/include/giomm-2.4/giomm.h:44,
                 from /usr/include/gtkmm-3.0/gtkmm.h:99,
                 from /builddir/build/BUILD/cherrytree-future-1.7.1-build/cherrytree-1.7.1/src/ct/ct_main_win.h:31,
                 from /builddir/build/BUILD/cherrytree-future-1.7.1-build/cherrytree-1.7.1/src/ct/ct_actions.h:26,
                 from /builddir/build/BUILD/cherrytree-future-1.7.1-build/cherrytree-1.7.1/src/ct/ct_actions_find.cc:24:
/usr/include/giomm-2.4/giomm/dbusactiongroup.h:32:7: error: conflicting declaration ‘using GDBusActionGroupClass = struct _GDBusActionGroupClass’
   32 | using GDBusActionGroupClass = struct _GDBusActionGroupClass;
      |       ^~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/giomm-2.4/giomm.h:73:
/usr/include/giomm-2.4/giomm/emblem.h:31:7: error: conflicting declaration ‘using GEmblemClass = struct _GEmblemClass’
   31 | using GEmblemClass = struct _GEmblemClass;
      |       ^~~~~~~~~~~~

The glibmm2.4 package is the same version (2.66.9) between F44 and Rawhide, but the GNU toolchain is upgraded in Rawhide, so that may be the difference. I'm not seeing anything else in the F45 Change Set that stands out, but I am also not a C++ologist.

[giuspen]

Hi @funnelfiasco, thanks for reporting, this seems to be an issue of incompatibility between the current version of GLib and Glibmm in rawhide.

I did some analysys with the help of Github copilot:

This looks like an ABI/header compatibility clash between old glibmm wrappers and newer glib/gio headers in Rawhide, not a cherrytree logic bug.

The log confirms the exact clash: Rawhide’s /usr/include/glib-2.0/gio/*.h now declares GDBusActionGroupClass/GEmblemClass differently than giomm-2.4 from glibmm 2.66.9.

What is happening:

1. Rawhide has newer GLib/GIO headers where these types are declared as:

• typedef struct GDBusActionGroupClass GDBusActionGroupClass
• typedef struct GEmblemClass GEmblemClass

2. The older giomm/glibmm headers (from glibmm 2.66.9) still declare aliases to underscored tags:

• using GDBusActionGroupClass = struct _GDBusActionGroupClass
• using GEmblemClass = struct _GEmblemClass

3. Those are different type tags, so C++ reports conflicting declarations.

Best fix:

1. Fix/update the distro dependency set (preferred):

• Use a glibmm/giomm package version (or backport patch) that is compatible with the newer GLib headers.

Maybe you can raise an issue to Fedora rawhide?

[funnelfiasco]

Thanks! Opened https://bugzilla.redhat.com/show_bug.cgi?id=2506292

I'll close this for now and reopen or open a new issue if there's follow-up.