Example for C++ coverage processing with different folders for source/notes and coverage data files?

Hello,

I am trying to use grcov to process coverage information of a C++ application on a runtime server.

$ ./grcov --version
grcov 0.8.18
$ gcov --version
gcov (GCC) 11.2.1 20220127 (Red Hat 11.2.1-9)

When executing the application, the folder COVERAGE/<PID> is created containing the gcda files:

COVERAGE/<PID>/output/lib/awesome/o/awesome/file.gcda

I have a SOURCES folder that contains the source code of the application and the associated gcno files:

SOURCES/
  lib/awesome/file.cpp
  output/lib/awesome/o/awesome/file.gcno

I don't know how to call grcov with this setup, I have tried the below command but it fails:

$ ./grcov \
  --output-types lcov \
  --output-path grcov.lcov.info \
  --source-dir SOURCES \
  COVERAGE/<PID>/
[ERROR] A panic occurred at src/producer.rs:544: No input files found

Do you know if this is possible?

Thank you.

Start by reproducing the shown grcov 0.8.18 command with the SOURCES and COVERAGE/ layout, using the sample C++ paths and gcda/gcno files from the issue. Done means the repository contains a clear example or documented invocation for processing this separated source and coverage-data setup without the reported “No input files found” failure.