subversion-1.14.3-2.fc40 fails to build in Fedora 40:

bin/sh "/builddir/build/BUILD/subversion-1.14.3/libtool" --tag=CC --silent --mode=compile gcc -O2 -flto=auto -ffat-lto-objects -fexceptions -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 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer   -DNDEBUG -Wno-int-to-pointer-cast -DLINUX -D_REENTRANT -D_GNU_SOURCE -DQT_DBUS_LIB -DQT_GUI_LIB -DQT_CORE_LIB   -I/builddir/build/BUILD/subversion-1.14.3/subversion -I/builddir/build/BUILD/subversion-1.14.3/subversion/include -I/builddir/build/BUILD/subversion-1.14.3/subversion/bindings/swig -I/builddir/build/BUILD/subversion-1.14.3/subversion/bindings/swig/include -I/builddir/build/BUILD/subversion-1.14.3/subversion/bindings/swig/proxy -I/builddir/build/BUILD/subversion-1.14.3/subversion/bindings/swig/proxy -I/usr/include/apr-1  -I/usr/include/apr-1  -I/usr/include -I/builddir/build/BUILD/subversion-1.14.3/subversion/bindings/swig/ruby/libsvn_swig_ruby -I./subversion/include -I./subversion -I/usr/include/apr-1   -I/usr/include/apr-1 -I/usr/include/libsecret-1 -I/usr/include/gio-unix-2.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -DWITH_GZFILEOP -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/p11-kit-1 -I/usr/include/sysprof-6 -pthread -I/usr/include/dbus-1.0 -I/usr/lib64/dbus-1.0/include -I/usr/include/qt5/QtDBus -I/usr/include/qt5 -I/usr/include/qt5/QtGui -I/usr/include/qt5/QtCore  -I/usr/include/KF5/KWallet -I/usr/include/KF5/KCoreAddons -I/usr/include/KF5/KI18n -I/usr/include -I/usr/include -I/usr/include/serf-1 -DWITH_GZFILEOP  -o subversion/bindings/swig/ruby/libsvn_swig_ruby/swigutil_rb.lo -c subversion/bindings/swig/ruby/libsvn_swig_ruby/swigutil_rb.c
[...]
subversion/bindings/swig/ruby/libsvn_swig_ruby/swigutil_rb.c: In function 'svn_swig_rb_set_pool':
subversion/bindings/swig/ruby/libsvn_swig_ruby/swigutil_rb.c:791:29: error: passing argument 2 of 'rb_hash_foreach' from incompatible pointer type [-Wincompatible-pointer-types]
  791 |     rb_hash_foreach(target, rb_set_pool_for_hash_callback, (VALUE)&arg);
      |                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                             |
      |                             int (*)(VALUE,  VALUE,  struct rb_set_pool_for_hash_arg *) {aka int (*)(long unsigned int,  long unsigned int,  struct rb_set_pool_for_hash_arg *)}

A difference between passing and failing build root is at <https://koschei.fedoraproject.org/build/17076049>. This is probably triggered by upgrading gcc from 13.2.1-6.fc40 to 14.0.1-0.1.fc40.