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rust/compiler/rustc_codegen_ssa
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Guillaume Gomez 526c67f37b
Rollup merge of #131829 - Zalathar:goodbye-zprofile, r=chenyukang 
Remove support for `-Zprofile` (gcov-style coverage instrumentation)

Tracking issue: #42524

MCP: https://github.com/rust-lang/compiler-team/issues/798

---

This PR removes the unstable `-Zprofile` flag, which enables ”gcov-style” coverage instrumentation, along with its associated `-Zprofile-emit` configuration flag.

(The profile flag predates and is almost entirely separate from the stable `-Cinstrument-coverage` flag.)

Notably, the `-Zprofile` flag:
- Is largely untested in-tree, having only one run-make test that does not check whether its output is correct or useful.
- Has no known maintainer.
- Has seen no push towards stabilization.
- Has at least one severe regression reported in 2022 that apparently remains unaddressed.
  - #100125
- Is confusingly named, since it appears to be more about coverage than performance profiling, and has nothing to do with PGO.
- Is fundamentally limited by relying on counters auto-inserted by LLVM, with no knowledge of Rust beyond debuginfo.
2024-11-02 03:08:49 +08:00
..
src Rollup merge of #131829 - Zalathar:goodbye-zprofile, r=chenyukang 2024-11-02 03:08:49 +08:00
Cargo.toml compiler: Factor rustc_target::abi out of cg_ssa 2024-10-08 18:24:56 -07:00
messages.ftl Rollup merge of #130308 - davidtwco:tied-target-consolidation, r=wesleywiser 2024-10-10 22:00:45 +02:00
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.