[Bug c/47901] -Wall should not imply -Wformat-zero-length by default

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47901

--- Comment #8 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-04-26 14:19:13 UTC ---
I still think it may be fine moving this warning to -Wextra, since it gives
false positives and when it does, they are hard to avoid.

Anders, you may get to convince more people by sending a patch to gcc-patches
with your reasoning.