Move log messages to stderr

[ZJaume]

Hi everyone, Prompsit fellow here!

The standard way of doing this in Unix is to use stderr. Otherwise, if the program is inside a pipe and fails due to wrong arguments for example, the help message gets scrambled with standard output and input. I also changed the tmx_compiler.cc because the method already has an output file, so I'm assuming messages have to go to stderr. But I don't know how that component works and what the printed information means.

[TinoDidriksen]

Error message should indeed go to stderr, but usage should not normally do so. It is important that -? / -h / --help output goes to stdout.

[ZJaume]

So I guess the print_usage should print to stderr only when errors occurr?

[TinoDidriksen]

Yeah, which is pretty simple to accomplish - just pass in stdout or stderr.

[ZJaume]

I found that bash commands print to stderr when -? but stdout with -h, is this ok for you or do you prefer -? also in stdout? I think -? is an error and should go to stderr for the reasons I was pointing out at the beginning.

[TinoDidriksen]

I have merged an altered version of your suggestion.

[ZJaume]

Thank you! I was indeed waiting for your response to push that modications.