I've tried geany -g -P and other methods. no way can do it.

I guess you already read the docs about tags generation?
https://www.geany.org/manual/current/index.html#generating-a-global-tags-file

But you might also find the following two plugins useful:
https://github.com/geany/geany-plugins/tree/master/geanyctags

https://github.com/geany/geany-plugins/tree/master/projectorganizer

Probably projectorganizer solves your problem best.

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