src/doc/unstable-book/src/compiler-flags/profile.md

   1 # `profile`
   2
   3 The tracking issue for this feature is: [#42524](https://github.com/rust-lang/rust/issues/42524).
   4
   5 ------------------------
   6
   7 This feature allows the generation of code coverage reports.
   8
   9 Set the `-Zprofile` compiler flag in order to enable gcov profiling.
  10
  11 For example:
  12 ```Bash
  13 cargo new testgcov --bin
  14 cd testgcov
  15 export RUSTFLAGS="-Zprofile"
  16 cargo build
  17 cargo run
  18 ```
  19
  20 Once you've built and run your program, files with the `gcno` (after build) and `gcda` (after execution) extensions will be created.
  21 You can parse them with [llvm-cov gcov](http://llvm.org/docs/CommandGuide/llvm-cov.html#llvm-cov-gcov) or [grcov](https://github.com/marco-c/grcov).