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bors f437c86ef8 Auto merge of #143613 - Enselic:panic-abort-uwtables, r=petrochenkov 
Fix backtraces with `-C panic=abort` on linux; emit unwind tables by default

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.

Closes https://github.com/rust-lang/rust/issues/81902 which is **regression-from-stable-to-stable**
Closes https://github.com/rust-lang/rust/issues/94815

### 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 https://github.com/rust-lang/rust/pull/45031 and https://github.com/rust-lang/rust/issues/81902#issuecomment-3046487084).

In 1.45 a workaround in the form of `-C force-unwind-tables=yes` was added (see https://github.com/rust-lang/rust/pull/69984).

`-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.

# Release Note Entry Draft:

## Compatibility Notes

* [Fix backtraces with `-C panic=abort` on Linux by generating unwind tables by default](https://github.com/rust-lang/rust/pull/143613). Build with `-C force-unwind-tables=no` to keep omitting unwind tables.

try-job: aarch64-apple
try-job: armhf-gnu
try-job: aarch64-msvc-1
2025-10-03 15:02:37 +00:00
..
rustc Make llvm_enzyme a regular cargo feature 2025-09-15 15:31:56 +00:00
rustc_abi Rollup merge of #147134 - workingjubilee:remove-explicit-abialign-deref, r=Zalathar 2025-09-29 15:44:55 +10:00
rustc_arena
rustc_ast Use Iterator::eq and (dogfood) eq_by in compiler and library 2025-09-29 08:08:05 +03:00
rustc_ast_ir turn pointer width into an integer in target.json 2025-08-27 23:44:49 +02:00
rustc_ast_lowering Auto merge of #145882 - m-ou-se:format-args-extend-1-arg, r=petrochenkov 2025-09-26 04:34:09 +00:00
rustc_ast_passes Improve code and better check doc(cfg(...)) attributes 2025-09-27 11:29:49 +02:00
rustc_ast_pretty Revert introduction of [workspace.dependencies]. 2025-09-02 19:12:54 +10:00
rustc_attr_parsing Auto merge of #147231 - CrooseGit:dev/reucru01/extend_rustc_force_inline, r=saethlin 2025-10-02 21:43:10 +00:00
rustc_baked_icu_data Use default locale fallback data 2025-08-28 09:48:54 +00:00
rustc_borrowck Auto merge of #147138 - jackh726:split-canonical-bound, r=lcnr 2025-10-02 08:09:33 +00:00
rustc_builtin_macros Use Iterator::eq and (dogfood) eq_by in compiler and library 2025-09-29 08:08:05 +03:00
rustc_codegen_cranelift Auto merge of #147055 - beepster4096:subtype_is_not_a_projection, r=lcnr 2025-10-02 01:54:48 +00:00
rustc_codegen_gcc codegen: Generate dbg_value for the ref statement 2025-10-02 14:55:51 +08:00
rustc_codegen_llvm Auto merge of #142771 - dianqk:mir-stmt-debuginfo, r=cjgillot 2025-10-03 11:49:42 +00:00
rustc_codegen_ssa Auto merge of #142771 - dianqk:mir-stmt-debuginfo, r=cjgillot 2025-10-03 11:49:42 +00:00
rustc_const_eval Auto merge of #147055 - beepster4096:subtype_is_not_a_projection, r=lcnr 2025-10-02 01:54:48 +00:00
rustc_data_structures avoid calling insert_presorted more than once 2025-09-10 08:40:12 +02:00
rustc_driver compiler: Add Windows resources to rustc-main and rustc_driver 2025-09-05 14:06:31 -04:00
rustc_driver_impl fixes for numerous clippy warnings 2025-09-19 20:56:07 +00:00
rustc_error_codes Rollup merge of #146585 - hkBst:indexing-1, r=jdonszelmann 2025-10-02 10:27:49 +02:00
rustc_error_messages Revert introduction of [workspace.dependencies]. 2025-09-02 19:12:54 +10:00
rustc_errors fix: Filter suggestion parts that match existing code 2025-09-04 17:42:13 -06:00
rustc_expand Rollup merge of #146535 - joshtriplett:mbe-unsafe-attr, r=petrochenkov 2025-10-02 10:27:49 +02:00
rustc_feature Fix removed version of doc_auto_cfg, doc_cfg_hide 2025-09-29 09:45:27 +01:00
rustc_fluent_macro Revert introduction of [workspace.dependencies]. 2025-09-02 19:12:54 +10:00
rustc_fs_util Revert introduction of [workspace.dependencies]. 2025-09-02 19:12:54 +10:00
rustc_graphviz
rustc_hashes
rustc_hir Rollup merge of #147101 - yotamofek:pr/iter-eq-and-eq-by, r=jdonszelmann 2025-09-29 21:06:45 +10:00
rustc_hir_analysis Auto merge of #147138 - jackh726:split-canonical-bound, r=lcnr 2025-10-02 08:09:33 +00:00
rustc_hir_id rustc_hir_id: Add a comment explaining why the crate exists 2025-08-20 15:04:00 -07:00
rustc_hir_pretty Rollup merge of #146102 - fmease:rm-dead-eff-code-iii, r=fee1-dead 2025-09-02 17:08:58 +02:00
rustc_hir_typeck Rollup merge of #146585 - hkBst:indexing-1, r=jdonszelmann 2025-10-02 10:27:49 +02:00
rustc_incremental Revert introduction of [workspace.dependencies]. 2025-09-02 19:12:54 +10:00
rustc_index Apply cfg(bootstrap) replacement 2025-09-26 19:09:23 -04:00
rustc_index_macros Revert introduction of [workspace.dependencies]. 2025-09-02 19:12:54 +10:00
rustc_infer Auto merge of #147138 - jackh726:split-canonical-bound, r=lcnr 2025-10-02 08:09:33 +00:00
rustc_interface Rollup merge of #146596 - bjorn3:dummy_backend, r=SparrowLii 2025-09-30 21:53:33 +02:00
rustc_lexer Fix a crash/mislex when more than one frontmatter closing possibility is considered 2025-09-22 15:10:41 -04:00
rustc_lint Port #[macro_export] to the new attribute parsing infrastructure 2025-09-21 10:42:47 -04:00
rustc_lint_defs Apply cfg(bootstrap) replacement 2025-09-26 19:09:23 -04:00
rustc_llvm codegen: Generate dbg_value for the ref statement 2025-10-02 14:55:51 +08:00
rustc_log Update tracing, again 2025-09-08 09:23:37 -07:00
rustc_macros resolve: Do not finalize shadowed bindings 2025-09-25 20:36:14 +03:00
rustc_metadata Make def_path_hash_to_def_id not panic when passed an invalid hash 2025-09-26 18:36:15 +02:00
rustc_middle Auto merge of #142771 - dianqk:mir-stmt-debuginfo, r=cjgillot 2025-10-03 11:49:42 +00:00
rustc_mir_build Auto merge of #147055 - beepster4096:subtype_is_not_a_projection, r=lcnr 2025-10-02 01:54:48 +00:00
rustc_mir_dataflow mir-opt: Eliminate dead statements even if they are used by debuginfos 2025-10-02 14:58:59 +08:00
rustc_mir_transform mir-opt: Eliminate dead statements even if they are used by debuginfos 2025-10-02 14:58:59 +08:00
rustc_monomorphize Auto merge of #145717 - BoxyUwU:erase_regions_rename, r=lcnr 2025-09-09 15:04:44 +00:00
rustc_next_trait_solver Auto merge of #147138 - jackh726:split-canonical-bound, r=lcnr 2025-10-02 08:09:33 +00:00
rustc_parse Rollup merge of #147004 - estebank:ascription-in-pat, r=fee1-dead 2025-10-02 10:27:50 +02:00
rustc_parse_format Revert introduction of [workspace.dependencies]. 2025-09-02 19:12:54 +10:00
rustc_passes Improve code and fix typo 2025-09-27 11:29:50 +02:00
rustc_pattern_analysis Rename various "concrete opaque type" terminology to say "hidden type" 2025-09-27 22:58:02 +01:00
rustc_privacy fix doc comments to be more standard 2025-09-26 09:25:56 +00:00
rustc_proc_macro Revert introduction of [workspace.dependencies]. 2025-09-02 19:12:54 +10:00
rustc_public Auto merge of #147138 - jackh726:split-canonical-bound, r=lcnr 2025-10-02 08:09:33 +00:00
rustc_public_bridge Remove useless lifetime parameter. 2025-07-23 23:54:37 +00:00
rustc_query_impl fixup limit handling code 2025-09-08 15:07:12 -07:00
rustc_query_system fixup limit handling code 2025-09-08 15:07:12 -07:00
rustc_resolve Detect unconstructable re-exported tuple structs 2025-09-28 21:33:34 +00:00
rustc_sanitizers Split Bound into Canonical and Bound 2025-09-30 12:58:28 -04:00
rustc_serialize Revert introduction of [workspace.dependencies]. 2025-09-02 19:12:54 +10:00
rustc_session Auto merge of #143613 - Enselic:panic-abort-uwtables, r=petrochenkov 2025-10-03 15:02:37 +00:00
rustc_span Rollup merge of #146457 - alexcrichton:wasm-no-exn-instructions, r=bjorn3 2025-09-29 21:37:50 -04:00
rustc_symbol_mangling Auto merge of #147138 - jackh726:split-canonical-bound, r=lcnr 2025-10-02 08:09:33 +00:00
rustc_target Auto merge of #143613 - Enselic:panic-abort-uwtables, r=petrochenkov 2025-10-03 15:02:37 +00:00
rustc_thread_pool Fix a dangling reference in rustc_thread_pool 2025-09-22 14:04:04 -07:00
rustc_trait_selection Auto merge of #147138 - jackh726:split-canonical-bound, r=lcnr 2025-10-02 08:09:33 +00:00
rustc_traits erase_regions to erase_and_anonymize_regions 2025-09-09 14:49:16 +02:00
rustc_transmute remove explicit deref of AbiAlign for most methods 2025-09-28 15:02:14 -07:00
rustc_ty_utils Auto merge of #147138 - jackh726:split-canonical-bound, r=lcnr 2025-10-02 08:09:33 +00:00
rustc_type_ir Auto merge of #147138 - jackh726:split-canonical-bound, r=lcnr 2025-10-02 08:09:33 +00:00
rustc_type_ir_macros Revert introduction of [workspace.dependencies]. 2025-09-02 19:12:54 +10:00
rustc_windows_rc [win] Use find-msvc-tools instead of cc to find the linker and rc on Windows 2025-09-19 12:00:30 -07:00