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A comment on The biggest threat to Rust's sustainability. Parent comment

Re:The biggest threat to Rust's sustainability by roca on Friday March 19, 2021 @07:34AM (#26512123)
> changing -O2 to -O3 in gcc that ended in sporadic crashes when cross-compiling for 1 specific platform.

Sure, this happens regularly in C and C++ because large programs inevitably depend on undefined behaviour, and changing compiler versions, optimization levels and target platforms is allowed to change that behaviour.

For the last five years I've been writing 99% safe Rust code, which is designed to have no undefined behavior, and I think it's not a coincidence that I can't remember ever having a compiler update break code at runtime. Once in a long while a compiler update will fail to compile some existing code, but that's not a safety issue.

The idea that C and C++ compilers are somehow more stable across releases is a mirage. https://lwn.net/Articles/845691/ https://lwn.net/Articles/845775/

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Re:The biggest threat to Rust's sustainability by bluGill on Friday March 19, 2021 @10:16AM (#26513583)
No, this happens because bugs in compilers happen. Nothing to do with undefined behavior. (Which is a separate problem)
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Re:The biggest threat to Rust's sustainability by steveklabnik on Friday March 19, 2021 @10:24AM (#26513684)
It can be both.
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