Unable to generate coverage report using lcov on MacOs 15.3.1 #31927

Is there an existing issue for this?

• I have searched the existing issues

Current behaviour

While trying to get a coverage report , the report generation fails complaining of duplicate function definitions.

Expected behaviour

Generate a coverage report for the branch.

Steps to reproduce

cmake -B build -DCMAKE_BUILD_TYPE=Coverage
cmake --build build
cmake -P build/Coverage.cmake

Relevant log output

Capturing coverage data from src
geninfo cmd: '/opt/homebrew/Cellar/lcov/2.3/bin/geninfo src --toolname lcov --output-filename baseline.info --initial --gcov-tool /Users/prabhatverma/projects/bitcoin/build/cov_tool_wrapper.sh'
Found LLVM gcov version 16.0.0, which emulates gcov version 4.2.0
Using intermediate gcov format
Recording 'internal' directories:
        /Users/prabhatverma/projects/bitcoin/build/src
        src
Writing temporary data to /tmp/geninfo_datI48l
Scanning src for .gcno files ...
Found 401 graph files in src
using: chunkSize: 1, nchunks:401, intervalLength:20
lcov: WARNING: (gcov) GCOV did not produce any data for /Users/prabhatverma/projects/bitcoin/build/src/secp256k1/src/CMakeFiles/secp256k1_precomputed.dir/precomputed_ecmult.c.gcno
        (use "lcov --ignore-errors gcov,gcov ..." to suppress this warning)
lcov: WARNING: (gcov) GCOV did not produce any data for /Users/prabhatverma/projects/bitcoin/build/src/secp256k1/src/CMakeFiles/secp256k1_precomputed.dir/precomputed_ecmult_gen.c.gcno
Message summary:
  1 error message:
    inconsistent: 1
  2 warning messages:
    gcov: 2
lcov: ERROR: (inconsistent) "/Users/prabhatverma/projects/bitcoin/src/secp256k1/src/scalar_impl.h":67: duplicate function 'secp256k1_scalar_split_lambda' starts on line 67 but previous definition started on 142 while capturing from src/secp256k1/src/CMakeFiles/exhaustive_tests.dir/tests_exhaustive.c.gcno.
        (use "lcov --ignore-errors inconsistent ..." to bypass this error)
CMake Error at build/CoverageInclude.cmake:45 (execute_process):
  execute_process failed command indexes:

    1: "Child return code: 1"

Call Stack (most recent call first):
  build/Coverage.cmake:5 (include)

How did you obtain Bitcoin Core

Compiled from source

What version of Bitcoin Core are you using?

master@5b8fd7c

Operating system and version

MacOs Sequoia 15.3.1

Machine specifications

No response

This is a known issue. While I don't have macOS, some reported that it was working with clang/llvm tooling.

You can try -DCMAKE_C_COMPILER='clang' -DCMAKE_CXX_COMPILER='clang++' -DCMAKE_CXX_FLAGS='-fprofile-instr-generate -fcoverage-mapping' and llvm-cov/llvm-profdata and see if that works for you.

If it works for you, feel free to update the doc/developer-notes.md to mention it. Also, I wonder it it could make sense to add a CMakePreset for a clang coverage build based on the flags?

Reproduced the issue on macOS 15.3.1 arm64 m1 max.