nightly: cargo cov creates empty report

[shahn]

Pretty much as the title says, on nightly cargo cov doesn't create any gcda or gcno files and the browser shows an empty html page

[king6cong]

The same here

[mathstuf]

I'm also seeing this with 1.24.0 final.

[lo48576]

Same for me.

$ rustc +nightly --version
rustc 1.26.0-nightly (80785a547 2018-03-30)
$ cargo +nightly --version
cargo 1.26.0-nightly (d63299b6e 2018-03-28)
$

When running cargo +nightly cov test normally, it generates no *.gdca files.
I tried

RUSTFLAGS='-Z profile -C codegen-units=1' CARGO_CFG_REGEX_DISABLE_AUTO_OPTIMIZATIONS=1 cargo +nightly cov test --lib

and it generates *.gdca files, but it emits many

profiling: (path).gdca: cannot merge previous GCDA file: corrupt arc tag (0xfoobar)

error messages for my crate and exit unsuccessfully...

[lo48576]

RUSTFLAGS='-Z profile -C codegen-units=1' CARGO_CFG_REGEX_DISABLE_AUTO_OPTIMIZATIONS=1 cargo +nightly cov build --lib

This successfully exited, and I ran cargo +nightly cov report --open, then it generates html report with no entries... 🙄

[mssun]

Any updates?

[themasch]

I'm also having this issue on 1.25.0. cargo cov test runs, executes all tests and creates no files. Report is empty, too.

But since others seem to have this issue on nightly only, maybe I am doing something wrong?

[kaiba696]

^ +1

[kennytm]

Fixed by 6ecd86a and 05d1c1e.