helm-gtags-parse-file is inconsistent with helm-gtags-find-tag-from-here

[introom]

suppose I am in
https://github.com/torvalds/linux/blob/master/net/ipv4/tcp_bbr.c

for the tag: pacing_gain

'helm-gtags-find-tag-from-here' finds the result, while 'helm-gtags-parse-file' failed.

video record here:
https://asciinema.org/a/9yg9ehh5iu4o617rxqgvxr9ut

[syohex]

GNU Global does not support tagging variable, struct fields definitions. GNU global --symbol option can show them but it shows symbol references too. And --symbol option cannot use with --definition option.

[introom]

how to make the result of `helm-gtags-parse-file' be the combination of both "global -s" and "global -d". would you please let me know which place to modify ?