ImportError: dynamic module does not define module export function

Bug Report

When mypy is built with mold linker and LTO (both are necessary i.e. no error with mold + no LTO or bfd + LTO), mypy fails with ImportError: dynamic module does not define module export function.

To Reproduce

Run mypy.

Expected Behavior

No ImportError

Actual Behavior

Traceback (most recent call last):
  File "/usr/lib/python-exec/python3.13/mypy", line 5, in <module>
    from mypy.__main__ import console_entry
ImportError: dynamic module does not define module export function (PyInit_edfc647aaf02b20aa651__mypyc)

Your Environment

• Mypy version used: 1.17.0
• Mypy command-line flags: The error occurs regardless of flags.
• Mypy configuration options from mypy.ini (and other config files): None
• Python version used: 3.13.5
• System: Gentoo
• emerge --info dev-python/mypy:

dev-python/mypy-1.17.0::gentoo was built with the following:
USE="debug native-extensions -test" PYTHON_TARGETS="python3_13 -python3_11 -python3_12"
CFLAGS="-march=native -flto=auto -Og -ggdb -pipe -Wl,-O1 -Wl,--as-needed -fuse-ld=mold"
CXXFLAGS="-march=native -flto=auto -Og -ggdb -pipe -Wl,-O1 -Wl,--as-needed -fuse-ld=mold"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs binpkg-multi-instance buildpkg-live config-protect-if-modified distlocks ebuild-locks export-pms-vars fixlafiles ipc-sandbox merge-sync merge-wait multilib-strict network-sandbox news nostrip parallel-fetch pid-sandbox pkgdir-index-trusted preserve-libs protect-owned qa-unresolved-soname-deps sandbox strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync"
LDFLAGS="-Wl,-O1 -Wl,--as-needed -fuse-ld=mold -march=native -flto=auto -Og -ggdb -pipe"

Start by reproducing mypy with Python 3.13.5, mold, and LTO using the reported Gentoo build flags. Trace how the native extension is built and linked; done means mypy starts without the reported ImportError under mold and LTO.