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7c263adb2a
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.
20 lines
322 B
Rust
20 lines
322 B
Rust
// run-pass
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// compile-flags: -C overflow_checks=true
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#![feature(cfg_overflow_checks)]
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fn main() {
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assert!(cfg!(overflow_checks));
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assert!(compiles_differently());
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}
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#[cfg(overflow_checks)]
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fn compiles_differently()->bool {
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true
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}
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#[cfg(not(overflow_checks))]
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fn compiles_differently()->bool {
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false
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}
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