rust/compiler/rustc_target/src/spec/base/android.rs, branch automation/bors/try

Fix backtraces with `-C panic=abort` on linux; emit unwind tables by default

2025-10-02T17:46:41+00:00

The linux backtrace unwinder relies on unwind tables to work properly, and generating and printing a backtrace is done by for example the default panic hook. Begin emitting unwind tables by default again with `-C panic=abort` (see history below) so that backtraces work. History ======= Backtraces with `-C panic=abort` used to work in Rust 1.22 but broke in Rust 1.23, because in 1.23 we stopped emitting unwind tables with `-C panic=abort` (see 24cc38e3b00). In 1.45 (see cda994633ee) a workaround in the form of `-C force-unwind-tables=yes` was added. `-C panic=abort` was added in [Rust 1.10](https://blog.rust-lang.org/2016/07/07/Rust-1.10/#what-s-in-1-10-stable) and the motivation was binary size and compile time. But given how confusing that behavior has turned out to be, it is better to make binary size optimization opt-in with `-C force-unwind-tables=no` rather than default since the current default breaks backtraces. Besides, if binary size is a primary concern, there are many other tricks that can be used that has a higher impact.

Reformat using the new identifier sorting from rustfmt

2024-09-22T23:11:29+00:00

Add `warn(unreachable_pub)` to `rustc_target`.

2024-09-02T22:49:54+00:00

Add emulated TLS support

2023-12-06T16:21:32+00:00

Currently LLVM uses emutls by default for some targets (such as android, openbsd), but rust does not use it, because `has_thread_local` is false. This commit has some changes to allow users to enable emutls: 1. add `-Zhas-thread-local` flag to specify that std uses `#[thread_local]` instead of pthread key. 2. when using emutls, decorate symbol names to find thread local symbol correctly. 3. change `-Zforce-emulated-tls` to `-Ztls-model=emulated` to explicitly specify whether to generate emutls.

target: move base specs to spec/base

2023-11-08T06:15:26+00:00

Signed-off-by: David Wood