Very strange compiler/linker related build failures in rawhide

[Fabio Valentini]

Hi all,

I'm starting to see various very strange kinds of build failures in
rawhide, that seem to have started with either of these updates (or a
combination of them):

- annobin 9.21-1.fc33 → 9.22-1.fc33
- binutils 2.34.0-6.fc33 → 2.34.0-7.fc33
- elfutils 0.179-2.fc33 → 0.180-2.fc33
- glibc 2.31.9000-13.fc33 → 2.31.9000-14.fc33

These rawhide updates all happened at roughly the same time, so it's
difficult to say which one of them is to blame (if any of them).

One error I've seen in libreoffice is a gcc / annobin segfault:

[build CXX] vcl/unx/gtk3/gtk3gtkinst.cxx
*** WARNING *** there are active plugins, do not report this as a bug
unless you can reproduce it without enabling any plugins.
Event                            | Plugins
PLUGIN_FINISH_UNIT               | annobin: Generate final annotations
PLUGIN_START_UNIT                | annobin: Generate global annotations
PLUGIN_ALL_PASSES_START          | annobin: Generate per-function annotations
PLUGIN_ALL_PASSES_END            | annobin: Register per-function end symbol
/builddir/build/BUILD/libreoffice-6.4.5.2/vcl/workben/vcldemo.cxx: In
destructor 'virtual DemoWin::RenderThread::~RenderThread()':
/builddir/build/BUILD/libreoffice-6.4.5.2/vcl/workben/vcldemo.cxx:1733:18:
internal compiler error: Segmentation fault
 1733 |             join();
      |                  ^

Other errors look like this one from switchboard-plug-onlineaccounts:

src/libonline-accounts.so.p/Authentification/Server.c: In function
‘online_accounts_server_on_bus_acquired’:
src/libonline-accounts.so.p/Authentification/Server.c:498:2: error:
function ‘__errno_location’ is initialized like a variable
  498 |  gint errno = 0;
      |  ^~~~

Where errno is neither __errno_location, nor a function, but a gint??

Other failures I've seen end up with linker failures, line these, from
postgresql:

ld: undefined reference to `postgresql_subtrans__checkpoint__start_semaphore'

Does somebody have a clue what's going on here? It's currently
blocking rawhide composes because libreoffice fails to build /
install.

See also: https://pagure.io/releng/failed-composes/issue/1571

Thanks,
Fabio