You can write a regex for what you need in the "Error regular expression" text box in the Build Commands configuration. I think you can also store the regexp in the `filetype.yourlanguage` file.
Docs: http://www.geany.org/manual/current/index.html#build-menu-configuration
Yes, I was aware of this. As I said, *i was reading the [build-menu]*. The question was: how to distinguish errors from warnings and notices? I would like Geany to display errors in red, warnings in blue and notices in green. Is that possible? Unfortunately, the link you sent says nothing about this.
No this isn't possible, the regexes, or in their absence the built-in tests, just distinguish between a message that indicates a file and line number that Geany can jump to, and any other message. The purpose is to recognise the file and line information, not really to separate types of messages. The colour of messages is just to indicate that you can click on them or not.
Thanks. But I still don't know how to do it. Obviously, I wouldn't like to browse C source files. In fact it was about 5 years ago when I last wrote a program in C, so even if I downloaded the sources, it wouldn't help.