Alan Zhao c5b3fe2094 [clang] Automatically add the returns_twice attribute to certain functions even if -fno-builtin is set (#133511) ...

Certain functions require the `returns_twice` attribute in order to
produce correct codegen. However, `-fno-builtin` removes all knowledge
of functions that require this attribute, so this PR modifies Clang to
add the `returns_twice` attribute even if `-fno-builtin` is set. This
behavior is also consistent with what GCC does.

It's not (easily) possible to get the builtin information from
`Builtins.td` because `-fno-builtin` causes Clang to never initialize
any builtins, so functions never get tokenized as functions/builtins
that require `returns_twice`. Therefore, the most straightforward
solution is to explicitly hard code the function names that require
`returns_twice`.

Fixes #122840

2025-03-31 09:42:34 -07:00

242 KiB

Raw Blame History

View Raw