Open mumbleskates opened 10 months ago
I'm not a maintainer on this project, but I just went through the tutorials twice myself. Once on macos, and once on linux.
I ran into a similar issue.
I think, but am not certain that the issue you ran into, is that the cargo cov
problem you ran into is not having the correct cargo subcommand installed.
The correct way I set this up was like this cargo install cargo-binutils
.
I did actually install the wrong subcommand cargo install cargo-cov
, which caused me to dig into my working rust-fuzz tutorial macos setup to discover I needed cargo-binutils
not cargo-cov
.
With that subcommand install, the tutorial works fine, with one other tweak I will file an issue on. (you need to tweak the path to the binary)
The rust-fuzz book coverage page should explicitly mention needing cargo install cargo-binutils
in order for the cargo cov
to launch the correct subcommand.
The rust-fuzz book coverage page does mention "installing LLVM-coverage tools", and on the linked rustc book page it causually mentions "In this case, you may also find cargo-binutils useful as a wrapper around these tools."
But IMHO it's not enough...
I will file an issue.
yeah, i already have LLVM-coverage tools installed. i have the whole LLVM-19 suite, so i was eventually able to figure out getting a coverage report directly with the underlying tools, as in the above example...
that's good to know that there is a different cargo subcommand entirely, in cargo-binutils
. cargo search
doesn't even find that one and it doesn't seem to be mentioned anywhere.
The commands described in the coverage page for generating a coverage report, or doing anything at all with the profdata files collected, are obsolete; none of the replacement or alternative commands seem to accept those arguments. For example,
cargo-cov
seemingly no longer has a "show" command at all.one command that does seem to work is
but for various reasons this might not be ideal.