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bors 503e129328 Auto merge of #118568 - DianQK:no-builtins-symbols, r=pnkfelix 
Avoid adding builtin functions to `symbols.o`

We found performance regressions in #113923. The problem seems to be that `--gc-sections` does not remove these symbols. I tested that lld removes these symbols, but ld and gold do not.

I found that `used` adds symbols to `symbols.o` at 3e202ead60/compiler/rustc_codegen_ssa/src/back/linker.rs (L1786-L1791).
The PR removes builtin functions.

Note that under LTO, ld still preserves these symbols. (lld will still remove them.)

The first commit also fixes #118559. But I think the second commit also makes sense.
2023-12-07 20:31:55 +00:00
..
src Auto merge of #118568 - DianQK:no-builtins-symbols, r=pnkfelix 2023-12-07 20:31:55 +00:00
Cargo.toml jobserver: check file descriptors 2023-11-29 18:00:03 +03:00
messages.ftl Remove cgu_reuse_tracker from Session 2023-10-09 18:39:41 +00:00
README.md mv compiler to compiler/ 2020-08-30 18:45:07 +03:00

README.md

Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.