Extraction of C macro usages

[IridiumXOR]

Hi,
I have a question: is it possible to extract the location of C macro used in code (for example the usage of list_for_each_head() macro in Linux kernel)? I'm able to extract their definition but not the usage locations. It seems that Cscope is able to identify them but I didn't find a flag for them in ctags (the only way that I have found is to define them using -I sintax)

Thanks

[masatake]

I have tried to distinguish tags for names defining something (definition tags) and names referencing something(reference tags). You are talking about reference tags.

In my understanding, the original ctags was a tool for extracting definition tags.
I added an infrastructure for handling reference tags to the main part; the code part commonly used in parsers provides a way to emit reference tags.
Some parsers utilize the framework

$ cat g.c
#define ACONDTION 1

#if ACONDTION
/* something here */
#endif
$ ~/bin/ctags --fields=+'{extras}'  --extras=+'{reference}' --roles-C.'{macro}'=+'{condition}' -o - /tmp/g.c
ACONDTION	/tmp/g.c	/^#define ACONDTION /;"	d	file:	extras:fileScope
ACONDTION	/tmp/g.c	/^#if ACONDTION$/;"	d	extras:reference

The first ACONDITION is a definition tag; it defines a macro.
The second one is a reference tag; it is used as a part of a condition.
Please, read ctags(1) (https://docs.ctags.io/en/latest/man/ctags.1.html) if you are interested in the complicated command line.

Though I introduced the infrastructure, parsers in ctags utilize it in very limited areas.
If you are interested in the area, see the output of ctags --list-roles=all.

One of the reasons is that extracting reference tags can make too large tags (> 8G for linux kernel). I wonder if users really want such a large output.

If you are interested in extracting reference tags more aggressively in C language, see #3535 .

[IridiumXOR]

Thanks a lot again :)
Sorry I started to use this fantastic tool only from some weeks and I don't understand all the options and its capabilities
Thanks again