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rust/compiler/rustc_codegen_llvm
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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 Update itertools to 0.11. 2023-11-22 08:13:21 +11:00
messages.ftl warn when using an unstable feature with -Ctarget-feature 2023-11-06 09:44:00 +01:00
README.md

README.md

The codegen crate contains the code to convert from MIR into LLVM IR, and then from LLVM IR into machine code. In general it contains code that runs towards the end of the compilation process.

For more information about how codegen works, see the rustc dev guide.