[Bug c++/82710] Incorrect warning:unnecessary parentheses in declaration of global friend functions [-Werror=parentheses]

[sylvestre at debian dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82710

--- Comment #1 from Sylvestre Ledru <sylvestre at debian dot org> ---
With gcc-8 (Debian 8-20171023-1) 8.0.0 20171023 (experimental) [trunk revision
253997]