tree 8e6d8ee70dc6f5a78dc6c4f329917ff9c0f2027e
parent f867f2de1ca0d0ca466351de9e09a066e93eb42a
author Fangrui Song <i@maskray.me> 1712944179 -0700
committer Copybara-Service <copybara-worker@google.com> 1712944542 -0700

[xray] Apply default visibility to __xray_CustomEvent/__xray_TypedEvent

`__xray_customevent` and `__xray_typedevent` are built-in functions in
Clang. With -fxray-instrument, they are lowered to `__xray_CustomEvent`
(with 2 arguments) or `__xray_TypedEvent` (with 3 arguments).

xray patching is supported for shared objects, but they may contain
`__xray_customevent` and `__xray_typedevent` references that need to be
satisfied by default visibility definitions exported by the executable.

lld since df54f627fad789ccb11c72a9fddf116decbeba0e, like GNU ld, catches
the scenario at link time.

GitOrigin-RevId: 9022d9c102a8c47616fbeb6a45b015db6bd2c17a