glog verbose logging & Boost program options

Question

I am using boost program options in my code and trying to add verbose logging using glog (google logging library).

The problem is that boost captures the command line options and I can not use the --v flag for controlling the verbose logging. Is there a method for setting the minloglevel from the code? I failed locating a function or a macro for doing that programatically...

I don't know if these flags can be set programatically in the Google Logging library, but if it can then you just add those options yourself. — Some programmer dude, Feb 05 '15 at 13:39
yes, I know I can add them myself, I am looking for a method for doing that programatically. — Rosa Gronchi, Feb 05 '15 at 13:49

Partha Lal · Accepted Answer · 2015-02-06T11:01:25.087

4

I had the same problem and am managing to set glog flags in my main function as follows:

namespace po = boost::program_options;

int main(int ac, char **av) {
    po::options_description desc("...");
    desc.add_options()
    ("verbosity,v", po::value<int>(), "set verbose logging level, defaults to 0")
    ;

    po::variables_map vm;
    try{
        po::store(po::parse_command_line(ac, av, desc), vm);
        po::notify(vm);
    }
    catch (po::required_option& e){
        ...
    }
    ...
    if (vm.count("verbosity")){
        FLAGS_v = vm["verbosity"].as<int>();
    }
    else{
        FLAGS_v = 0;
    }
    google::InitGoogleLogging("...");
}

edited Feb 06 '15 at 11:01

answered Feb 05 '15 at 16:03

Partha Lal

543
4
16

2

Perfect! I even prefer the short syntax: `( "verbosity,v", po::value( &FLAGS_v )->default_value(FLAGS_v), "set verbose logging level, defaults to 0")` – orzechow May 11 '15 at 15:19
I didn't know that was possible, neat! – Partha Lal May 11 '15 at 16:59

score 0 · Answer 2 · answered Feb 05 '15 at 14:36

0

I found one work around and one answer that should but doesn't work. You can use the environment variable GLOG_v to set the verbosity level

(on linux)GLOG_v=2 ./your_binary This works well but is not ideal

I also found the not very well documented function google::SetVLOGLevel(char*, int) that is exactly what I was looking for, but unfortunately using it throws an exception.

answered Feb 05 '15 at 14:36

Rosa Gronchi

1,828
15
25

You should probably have said "I also found the not very well documented function google::SetVLOGLevel(char*, int) that is exactly what I was looking for, but unfortunately using it throws an exception" in the question and then asked for someone to "solve" that. Preferrably with a SSCCE. There is probably a good reason why it fails at the time. – sehe Feb 05 '15 at 22:16

glog verbose logging & Boost program options

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