Vim finding where functions and such are declared

Question

In VS Code, there's a nice utility where I can right-click a keyword and it will allow me to view where that variable/function/macro/etc. is declared, defined, or used. For example, let's say in the following code:

I want to goto the place in the file (stdio.h) that declares this function. Is there a simple way where I can 'follow a file/function' in vim to be able to view this information upstream?

For reference, I do have ctags installed and my stdlib is located at:

$ gcc --print-file-name=libc.a 
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libc.a

Answer 1

Yes, use the tag operation. If you have generated a tags file of the set of files you are interested in. The ctags command can generate it for C and C++.

Then, in the source code, position vim's cursor on the symbol to look up and press ctrl-] character.

===== addendum =====

$ gcc -M > dir_list    # list directories which are searched    
$ vim dir_list      # edit file list to remove \ at end of line
                    # and remove the `.o` file listed
$ ctags -L dir_list *.c   # examine source files for symbols