I tried OpenCppCoverage (https://github.com/Unity-Technologies/OpenCppCoverage) 0.9.3 on SumatraPDF.

I installed the 64-bit version on Windows 10. I ran OpenCppCoverage.exe --sources sumatra -- .\dbg64\SumatraPDF.exe, opened a file, and closed the program.

--sources limits reporting to files whose paths match a given pattern. Using sumatra for the pattern matches all our source files, assuming the sources were checked out to the sumatrapdf directory (because sumatra matches sumatrapdf in the file path), and skips the sources for C/C++ libraries.

It generated a CoverageReport-${date} directory with an HTML report. There is a top-level index.html with links to the HTML file for each module (SumatraPDF.exe in our case).

They recommend running on debug code.

At the end, it reports generating reports for system DLLs, but it also says it can’t get symbols, so it doesn’t actually generate anything.

The HTML report isn’t great. Another option would be to use the --export_type=binary option, which generates a SumatraPDF.cov file, and write an HTML generator myself. I assume the format of the .cov file is simple.