[Bug c/120570] -pedantic option may not direct GCC to print a warning message if __attribute__ feature is used

[pavel.morozkin at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120570

--- Comment #2 from Pavel M <pavel.morozkin at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> Since __ is the implementation space, we don't error out on purpose.
Then why does "__int128 x;" lead to "warning: ISO C does not support '__int128'
types [-Wpedantic]"?