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rust/tests/ui/panic-runtime/two-panic-runtimes.rs

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Remove `compile-fail` test suite
2020-12-28 11:15:16 -06:00
//@ build-fail
//@ dont-check-compiler-stderr
rustc: Implement custom panic runtimes This commit is an implementation of [RFC 1513] which allows applications to alter the behavior of panics at compile time. A new compiler flag, `-C panic`, is added and accepts the values `unwind` or `panic`, with the default being `unwind`. This model affects how code is generated for the local crate, skipping generation of landing pads with `-C panic=abort`. [RFC 1513]: https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md Panic implementations are then provided by crates tagged with `#![panic_runtime]` and lazily required by crates with `#![needs_panic_runtime]`. The panic strategy (`-C panic` value) of the panic runtime must match the final product, and if the panic strategy is not `abort` then the entire DAG must have the same panic strategy. With the `-C panic=abort` strategy, users can expect a stable method to disable generation of landing pads, improving optimization in niche scenarios, decreasing compile time, and decreasing output binary size. With the `-C panic=unwind` strategy users can expect the existing ability to isolate failure in Rust code from the outside world. Organizationally, this commit dismantles the `sys_common::unwind` module in favor of some bits moving part of it to `libpanic_unwind` and the rest into the `panicking` module in libstd. The custom panic runtime support is pretty similar to the custom allocator support with the only major difference being how the panic runtime is injected (takes the `-C panic` flag into account).
2016-04-08 18:18:40 -05:00
//@ error-pattern:cannot link together two panic runtimes: panic_runtime_unwind and panic_runtime_unwind2
//@ aux-build:panic-runtime-unwind.rs
//@ aux-build:panic-runtime-unwind2.rs
//@ aux-build:panic-runtime-lang-items.rs
#![no_std]
rustc: Fix mixing crates with different `share_generics` This commit addresses #64319 by removing the `dylib` crate type from the list of crate type that exports generic symbols. The bug in #64319 arises because a `dylib` crate type was trying to export a symbol in an uptream crate but it miscalculated the symbol name of the uptream symbol. This isn't really necessary, though, since `dylib` crates aren't that heavily used, so we can just conservatively say that the `dylib` crate type never exports generic symbols, forcibly removing them from the exported symbol lists if were to otherwise find them. The fix here happens in two places: * First is in the `local_crate_exports_generics` method, indicating that it's now `false` for the `Dylib` crate type. Only rlibs actually export generics at this point. * Next is when we load exported symbols from upstream crate. If, for our compilation session, the crate may be included from a dynamic library, then its generic symbols are removed. When the crate was linked into a dynamic library its symbols weren't exported, so we can't consider them a candidate to link against. Overally this should avoid situations where we incorrectly calculate the upstream symbol names in the face of differnet `share_generics` options, ultimately... Closes #64319
2019-09-11 10:08:04 -05:00
#![no_main]
rustc: Implement custom panic runtimes This commit is an implementation of [RFC 1513] which allows applications to alter the behavior of panics at compile time. A new compiler flag, `-C panic`, is added and accepts the values `unwind` or `panic`, with the default being `unwind`. This model affects how code is generated for the local crate, skipping generation of landing pads with `-C panic=abort`. [RFC 1513]: https://github.com/rust-lang/rfcs/blob/master/text/1513-less-unwinding.md Panic implementations are then provided by crates tagged with `#![panic_runtime]` and lazily required by crates with `#![needs_panic_runtime]`. The panic strategy (`-C panic` value) of the panic runtime must match the final product, and if the panic strategy is not `abort` then the entire DAG must have the same panic strategy. With the `-C panic=abort` strategy, users can expect a stable method to disable generation of landing pads, improving optimization in niche scenarios, decreasing compile time, and decreasing output binary size. With the `-C panic=unwind` strategy users can expect the existing ability to isolate failure in Rust code from the outside world. Organizationally, this commit dismantles the `sys_common::unwind` module in favor of some bits moving part of it to `libpanic_unwind` and the rest into the `panicking` module in libstd. The custom panic runtime support is pretty similar to the custom allocator support with the only major difference being how the panic runtime is injected (takes the `-C panic` flag into account).
2016-04-08 18:18:40 -05:00
extern crate panic_runtime_unwind;
extern crate panic_runtime_unwind2;
extern crate panic_runtime_lang_items;
fn main() {}
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