build fails on Fedora 40

[es-fabricemarie]

Hi,
When building on Fedora40, I'm getting this error:

g++ -Wall -Wextra -Werror -O3 -I../include -D_FILE_OFFSET_BITS=64 -std=c++11 -Wold-style-cast -Wno-missing-field-initializers -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-U_FORTIFY_SOURCE,-D_FORTIFY_SOURCE=3 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -march=x86-64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer  -L../lib -Wl,-z,relro -Wl,--as-needed  -Wl,-z,pack-relative-relocs -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld-errors -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -Wl,--build-id=sha1 -specs=/usr/lib/rpm/redhat/redhat-package-notes  -o ../bin/bees bees.o bees-context.o bees-hash.o bees-resolve.o bees-roots.o bees-thread.o bees-trace.o bees-types.o bees-version.o bees-usage.o ../lib/libcrucible.a -lcrucible -lpthread
In member function ‘__ct ’,
    inlined from ‘__ct ’ at bees-trace.cc:53:2,
    inlined from ‘operator()’ at bees-roots.cc:764:4,
    inlined from ‘__invoke_impl’ at /usr/include/c++/14/bits/invoke.h:61:36,
    inlined from ‘__invoke_r’ at /usr/include/c++/14/bits/invoke.h:150:33,
    inlined from ‘_M_invoke’ at /usr/include/c++/14/bits/std_function.h:290:30:
/usr/include/c++/14/bits/std_function.h:391:17: error: ‘<anonymous>’ may be used uninitialized [-Werror=maybe-uninitialized]
  391 |             __x._M_manager(_M_functor, __x._M_functor, __clone_functor);
      |                 ^
/usr/include/c++/14/bits/std_function.h: In function ‘_M_invoke’:
/usr/include/c++/14/bits/std_function.h:267:7: note: by argument 2 of type ‘const union _Any_data & {ref-all}’ to ‘_M_manager’ declared here
  267 |       _M_manager(_Any_data& __dest, const _Any_data& __source,
      |       ^
bees-roots.cc:764:25: note: ‘<anonymous>’ declared here
  764 |                         BEESTRACE("calling transid_max_nocache");
      |                         ^
lto1: all warnings being treated as errors
make[2]: *** [/tmp/cc47wSlM.mk:23: /tmp/cc8Lchk2.ltrans7.ltrans.o] Error 1
make[2]: *** Waiting for unfinished jobs....
lto-wrapper: fatal error: make returned 2 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:43: ../bin/bees] Error 1
make[1]: Leaving directory '/home/builduser/rpmbuild/BUILD/bees/src'
make: *** [Makefile:39: src] Error 2

Looks like the default configuration on Fedora40 compiler is pretty strict.
I could remove the -Werror=maybe-uninitialized flag of course, but it defeats the purpose.

Hope this helps.