Coverage when spawning target/{profile}/{bin_name} in llvm-cov nextest --workspace?

[KSXGitHub]

I have integration tests that invoke the binary to test it comprehensively. It would be nice if coverage can be collected from the binary too.

Before opening this issue ticket, I have tested it by inspecting std::env::var("RUSTFLAGS") in build.rs but an Err was returned.

[taiki-e]

Binaries are supported, but coverage is not collected if the process is killed without completing (#235, limitation of LLVM/rustc.)

If it does not work, please provide a reproduction of the problem.

[taiki-e]

Before opening this issue ticket, I have tested it by inspecting std::env::var("RUSTFLAGS") in build.rs but an Err was returned.

Since Rust 1.55, Cargo does not pass the RUSTFLAGS environment variable to the build script. CARGO_ENCODED_RUSTFLAGS is passed instead. (rust-lang/cargo#9601)