Minor improvements to -Zprofile #71283
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Minor improvements to -Zprofile - `-Zprofile` is broken with codegen units because GCOV assumes that each source file corresponds to one object file. This PR makes `-Zprofile` automatically set codegen units to 1 and gives an error if `-Ccodegen-units=X` is specified on the command line (with `X != 1`). - The `profiler_builtins` crate is not suitable for `no_std` applications since it contains C code that depends on libc. In such cases a custom implementation of the LLVM gcov API (`llvm_gcov_init`, `llvm_gcda_*`) is needed. This PR adds `-Zno-profiler-runtime` flag which inhibits automatic injection of the `profiler_builtins` crate. cc @whitequark who implemented the original `-Zprofile` support
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Minor improvements to -Zprofile - `-Zprofile` is broken with codegen units because GCOV assumes that each source file corresponds to one object file. This PR makes `-Zprofile` automatically set codegen units to 1 and gives an error if `-Ccodegen-units=X` is specified on the command line (with `X != 1`). - The `profiler_builtins` crate is not suitable for `no_std` applications since it contains C code that depends on libc. In such cases a custom implementation of the LLVM gcov API (`llvm_gcov_init`, `llvm_gcda_*`) is needed. This PR adds `-Zno-profiler-runtime` flag which inhibits automatic injection of the `profiler_builtins` crate. cc @whitequark who implemented the original `-Zprofile` support
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Rollup of 5 pull requests Successful merges: - rust-lang#71271 (Move `MapInPlace` to rustc_data_structures) - rust-lang#71276 (miri-unleashed: test that we detect heap allocations) - rust-lang#71283 (Minor improvements to -Zprofile) - rust-lang#71287 (Explain why we shouldn't add inline attr to into_vec) - rust-lang#71303 (remove build warnings) Failed merges: r? @ghost
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@Amanieu Excellent work! |
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… r=cramertj Ignore -Zprofile when building compiler_builtins rust-lang#70846 made the `compiler_builtins` crate ignore the default codegen-units setting and instead always split each function into a different codegen unit. This unfortunately breaks `-Zprofile` which requires a single codegen unit per crate (see rust-lang#71283). You can notice this when building with `cargo -Zbuild-std` and `RUSTFLAGS` containing `-Zprofile`. This PR works around this issue by just ignoring `-Zprofile` for the `compiler-builtins` crate.
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… r=cramertj Ignore -Zprofile when building compiler_builtins rust-lang#70846 made the `compiler_builtins` crate ignore the default codegen-units setting and instead always split each function into a different codegen unit. This unfortunately breaks `-Zprofile` which requires a single codegen unit per crate (see rust-lang#71283). You can notice this when building with `cargo -Zbuild-std` and `RUSTFLAGS` containing `-Zprofile`. This PR works around this issue by just ignoring `-Zprofile` for the `compiler-builtins` crate.
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-Zprofileis broken with codegen units because GCOV assumes that each source file corresponds to one object file. This PR makes-Zprofileautomatically set codegen units to 1 and gives an error if-Ccodegen-units=Xis specified on the command line (withX != 1).profiler_builtinscrate is not suitable forno_stdapplications since it contains C code that depends on libc. In such cases a custom implementation of the LLVM gcov API (llvm_gcov_init,llvm_gcda_*) is needed. This PR adds-Zno-profiler-runtimeflag which inhibits automatic injection of theprofiler_builtinscrate.cc @whitequark who implemented the original
-Zprofilesupport