The gcc devkit contains (for example)

./x86_64-linux-gnu-to-x86_64-linux-gnu/libexec/gcc/x86_64-linux-gnu/13.2.0/liblto_plugin.so

but an LTO-enabled build (--enable-jvm-feature-link-time-opt) needs

./x86_64-linux-gnu-to-x86_64-linux-gnu/lib/bfd-plugins/liblto_plugin.so

Presumably the latter should be a symlink to the former. Manually making such a symlink in my installed devkit seemed to work.

Without this I get a build warning message during the build: "plugin needed to handle lto object", and later the build fails with a ton of undefined references.

See also this gcc bug about the same issue:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70345