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Add support for cfg(overflow_checks)

This PR adds support for detecting if overflow checks are enabled in similar fashion as debug_assertions are detected.
Possible use-case of this, for example, if we want to use checked integer casts in builds with overflow checks, e.g.

```rust
pub fn cast(val: usize)->u16 {
    if cfg!(overflow_checks) {
        val.try_into().unwrap()
    }
    else{
        vas as _
    }
}
```

Resolves #91130.
Tracking issue: #111466.
This commit is contained in:
AngelicosPhosphoros 2023-05-02 17:53:11 +04:00
parent f8d8ffa2eb
commit 7c263adb2a
8 changed files with 65 additions and 0 deletions

View file

@ -463,6 +463,7 @@ symbols! {
cfg_doctest,
cfg_eval,
cfg_hide,
cfg_overflow_checks,
cfg_panic,
cfg_sanitize,
cfg_target_abi,
@ -1065,6 +1066,7 @@ symbols! {
or_patterns,
other,
out,
overflow_checks,
overlapping_marker_traits,
owned_box,
packed,