How do I programmatically change the Eclipse CDT tool settings for a file?

Question

I want to programmatically (from a plugin) change the \"Other flags\" field in the Miscellaneous settings in the Tool Settings tab for an individual file in a CDT managed build

Answer 1

I suspect there might be problem in you IFileInfo creation. Here's the code that we use to obtain IResourceInfo for a translation unit to set per-file options:

protected IResourceInfo getResourceInfo(ITranslationUnit translationUnit, ICProjectDescription prjDescription) {

    ICProject cProject = translationUnit.getCProject();
    if (cProject != null) {
        ICConfigurationDescription cfgDescription = prjDescription.getActiveConfiguration();
        IConfiguration configuration = ManagedBuildManager.getConfigurationForDescription(cfgDescription);
        IPath projectPath = translationUnit.getResource().getProjectRelativePath(); 
        IResourceInfo ri = configuration.getResourceInfo(projectPath, true);

        if (ri == null) { 
            ri = configuration.createFileInfo(projectPath);
        }

        return ri;
    }

    return null;
}

Note this line, in particular:

IPath projectPath = translationUnit.getResource().getProjectRelativePath();

Maybe, all you need is to use getProjectRelativePath() in your code?