[Bug c/39438] Can't compile a wrapper around strftime with -Werror=format-nonliteral

[hugh at mimosa dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39438

--- Comment #9 from D. Hugh Redelmeier <hugh at mimosa dot com> ---
Created attachment 32784
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32784&action=edit
minimal C source code that demonstrates the problem

minimal C source code that demonstrates the problem.
Notice that the (system-provided) declaration annotates the format argument
dirrectly with __format.  I haven't found documentation for that.