> Gtags works well on small project but fails on big project.

Why did you find out that the size of the project was the cause?
I think you should start by simplifying the reproduction environment.
How about solving the following warnings first?

> Warning: cannot stat 'abs'. ignored.
> Warning: cannot stat 'lib32_debug'. ignored.
> Warning: cannot stat 'lib32_release'. ignored.
> Warning: cannot stat 'lib64_debug'. ignored.
> Warning: cannot stat 'lib64'. ignored.
> Warning: cannot stat 'lib64_release'. ignored.
> Warning: different level before and after #define macro. reseted.
> Warning: '{' doesn't exist after 'operator'.
> Warning: failed to parse template
> Warning: missing left '{'
...

I suggest moving this thread to the help mailing list.

Regards,
Shigio
-- 
Shigio YAMAGUCHI <shi...@gnu.org>
PGP fingerprint:
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