OpenE2K
/
rust
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Doc: unstable book - profile.md: improve wording 

- mention `--target` flag excludes RUSTFLAGS passing to build scripts and proc macros
This commit is contained in:
Jonathan Schwender 2020-06-03 11:05:56 +02:00
parent 2b26b8b32b
commit 7bf026eed6
No known key found for this signature in database
GPG Key ID: 009A0ACC60168113
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
src/doc/unstable-book/src/compiler-flags/profile.md
View File

@ -21,6 +21,7 @@ cargo run
Once you've built and run your program, files with the `gcno` (after build) and `gcda` (after execution) extensions will be created.
You can parse them with [llvm-cov gcov](https://llvm.org/docs/CommandGuide/llvm-cov.html#llvm-cov-gcov) or [grcov](https://github.com/mozilla/grcov).
Please note that `RUSTFLAGS` apply to everything that cargo builds and runs during a build, including build scripts!
To avoid this, pass a `RUSTC_WRAPPER` program to cargo that only adds the profiling flags to rustc for the specific
crates you want to profile.
Please note that `RUSTFLAGS` by default applies to everything that cargo builds and runs during a build!
When the `--target` flag is explicitly passed to cargo, the `RUSTFLAGS` no longer apply to build scripts and procedural macros.
For more fine-grained control consider passing a `RUSTC_WRAPPER` program to cargo that only adds the profiling flags to
rustc for the specific crates you want to profile.