With --project set, '-I' option might be ignored.

[wy163]

Hi,
In the file cppcheck/lib/cppcheck.cpp:

unsigned int CppCheck::check(const FileSettings &fs)
{
    // TODO: move to constructor when CppCheck no longer owns the settings
    if (mSettings.checks.isEnabled(Checks::unusedFunction) && !mUnusedFunctionsCheck)
        mUnusedFunctionsCheck.reset(new CheckUnusedFunctions());

    Settings tempSettings = mSettings; // this is a copy
    if (!tempSettings.userDefines.empty())
        tempSettings.userDefines += ';';
    if (mSettings.clang)
        tempSettings.userDefines += fs.defines;
    else
        tempSettings.userDefines += fs.cppcheckDefines();
    tempSettings.includePaths = fs.includePaths;
    tempSettings.userUndefs.insert(fs.undefs.cbegin(), fs.undefs.cend());

Maybe there is a problem with the code "tempSettings.includePaths = fs.includePaths;".
Why not append fs.includePaths to tempSettings.includePaths.

[wy163]

Hi, I think this may be a bug.
For example, with the command "cppcheck --project=/path/compile_commands.json -I /include_path main.c", the include_path will not take effect.