maint: accommodate upcoming, expanded list of warnings from gnulib

* configure.ac: Disable a new gcc warning, -Wsuggest-attribute=format,
since it triggers on copy.c (which I'm not inclined to adjust) and
factor.c's use of vfprintf which would appear to require a change
to stdio.h.

diff --git a/configure.ac b/configure.ac
index 51782a5..627920d 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -128,6 +128,7 @@ if test "$gl_gcc_warnings" = yes; then
   nw="$nw -Wmissing-format-attribute" # copy.c
   nw="$nw -Wunsafe-loop-optimizations" # a few src/*.c
   nw="$nw -Winline"                 # system.h's readdir_ignoring_dot_and_dotdot
+  nw="$nw -Wsuggest-attribute=format" # warns about copy.c and factor.c
 
   # Using -Wstrict-overflow is a pain, but the alternative is worse.
   # For an example, see the code that provoked this report: