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gccgcovlcov

cannot find an entry for .cpp.gcov in .gcno file, skipping file

g++ (Ubuntu 9.4.0-1ubuntu1~18.04) 9.4.0
gcov (Ubuntu 9.4.0-1ubuntu1~18.04) 9.4.0
lcov: LCOV version 1.13
  1. g++ -g -O0 --coverage main.cpp -o main
  2. ./main
  3. lcov -t "main" -o main.info -c -d . --gcov-tool gcov-9

The output:

Capturing coverage data from .
Found gcov version: 9.4.0
Scanning . for .gcda files ...
Found 1 data files in .
Processing main.gcda
geninfo: WARNING: /home/home/main.gcno: Overlong record at end of file!
geninfo: WARNING: cannot find an entry for main.cpp.gcov in .gcno file, skipping file!
Finished .info-file creation
  1. genhtml -o report main.info

The output:

genhtml: ERROR: no valid records found in tracefile main.info
Solution

  • So far I haven't managed to utilize lcov. Yet I've found a solution that works for me.

    1. Install gcovr https://github.com/gcovr/gcovr
    2. Build your application with -fprofile-arcs -ftest-coverage -g -O0
    3. Link gcov to your executable/libs (-lgcov)
    4. Create .gcov files with gcov-9 -b -l -p -c *.gcno command. (If you're using cmake you will need to run this command recursively through all CMakeFiles/{all subfolders}.dir/src/* directories)
    5. gcovr {rootDir} -r {sourceDir} -g -k --html --html-details -o tp.html

    rootDir - the directory you can access .gcov from. sourceDir - sources that shall be in tp.html report