[HELP] error: failed to merge profile data: process didn't exit successfully about cargo-llvm-cov HOT 4 CLOSED

RUN cargo nextest archive --workspace --archive-file test.tar.zst

You have to use cargo llvm-cov nextest-archive, like:

(We should perhaps expand the documentation of nextest to explain this or enhance our own documentation on nextest.)

from cargo-llvm-cov.

The issue with using cargo llvm-cov nextest-archive is that it recompiles everything again.

I have tried without success.

COPY --from=builder /app/target /app/target/llvm-cov-target/
COPY . .
RUN cargo llvm-cov nextest-archive --workspace --archive-file test.tar.zst

ENTRYPOINT ["cargo", "make", "docker-ci"]

Note that i mapped the build to /app/target/llvm-cov-target/ and /app/target/

We use a custom build command for a package and using nextest-archive does throw error

from cargo-llvm-cov.

The issue with using cargo llvm-cov nextest-archive is that it recompiles everything again.

This is a fundamental limitation of Rust's current code coverage (regardless of which way you use it). There are several RFCs and proposals to improve this, but none have been approved yet.

We use a custom build command for a package and using nextest-archive does throw error

I don't have any information about the project you are building, so I don't know the details, but it is possible that the old build artifact is doing something or the fact that rustflags is being applied to the build script is causing some problems. (The former can be addressed by running cargo clean first, the latter by passing --target option.)

from cargo-llvm-cov.

Thanks for your responses, I will try to investigate a bit more about this topic & avoid recompiling

from cargo-llvm-cov.