On 10 August 2016 at 13:06, Paolo Bonzini <bonz...@gnu.org> wrote: > > > On 10/08/2016 13:31, Manuel López-Ibáñez wrote: >> My only fear is that people not using -Wpedantic nor -pedantic-errors >> expect that GNU extensions work. This is a GNU extension that defines >> something that is undefined according to ISO. Enabling the warning >> with -Wextra is just annoying those people who may not care about >> other compilers. > > I think this warning falls in the same category as > -Wshift-negative-value. (In fact I dislike -Wshift-negative-value a > lot, and would put that one under -Wpedantic only).
It is not the same category. One is compile-time UB and the other is runtime UB. See: https://gcc.gnu.org/ml/gcc-patches/2015-04/msg01551.html and https://gcc.gnu.org/ml/gcc-patches/2015-04/msg01529.html Cheers, Manuel.
