`couldn't be interpretted: missing section: CoverageFunctions`

[lcmgh]

In my integration tests I am spawning my app via Command triggered cargo run.

When executing cargo tarpaulin --follow-exec I am getting some errors

2024-09-17T12:25:29.431195Z  INFO cargo_tarpaulin::statemachine::instrumented: For binary: target/debug/deps/app-7bb51c4783d6a2f3
2024-09-17T12:25:29.431211Z  INFO cargo_tarpaulin::statemachine::instrumented: Generated: target/tarpaulin/profraws/amdemo-7bb51c4783d6a2f3_5880590785421624853_0-11505.profraw
2024-09-17T12:25:29.431214Z  INFO cargo_tarpaulin::statemachine::instrumented: Merging coverage reports
2024-09-17T12:25:29.666884Z  INFO cargo_tarpaulin::statemachine::instrumented: Mapping coverage data to source
2024-09-17T12:25:29.678600Z ERROR llvm_profparser::coverage::coverage_mapping: /Users/app/target/debug/app couldn't be interpretted: missing section: CoverageFunction

Still I am getting

15.31% coverage, 81/529 lines covered, +15.31% change in coverage

tarpaulin 0.31.2
latest macos

[xd009642]

The coverage functions section is the first one I try, so likely the spawned binaries haven't been built with the instrumentation enabled. If you add --print-rust-flags to your CLI prompt and then set that as your RUSTFLAGS env var before the spawned command is built you might get the coverage information as expected