Because I have a file containing many Cairo library functions

Do you mean the source of Cairo or do you mean your own code which just happens to use Cairo functions?

I want to complete these functions in a new file

Function defined in an open file in the same (or similar, eg C/C++) language will be available for autocomplete in other files of the same language. But just using a function in your file is not a definition and is not recognised for autocomplete or the symbol pane. Also files included in your files are not parsed, so #include <cairo.h> will not make cairo functions available for autocomplete.

I've tried geany -g -P

You probably don't want the -P, you want the preprocessor to pull in the headers included from cairo.h

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