-Wformat is needed by gcc 4.8 (closes #17547)

Misc/NEWS

@@ -223,6 +223,12 @@ Documentation
 - Issue #6696: add documentation for the Profile objects, and improve
   profile/cProfile docs.  Patch by Tom Pinckney.
 
+Build
+-----
+
+- Issue #17547: In configure, explicitly pass -Wformat for the benefit for GCC
+  4.8.
+
 
 What's New in Python 3.3.1?
 ===========================

configure

@@ -6525,7 +6525,7 @@ then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether gcc supports ParseTuple __format__" >&5
 $as_echo_n "checking whether gcc supports ParseTuple __format__... " >&6; }
   save_CFLAGS=$CFLAGS
-  CFLAGS="$CFLAGS -Werror"
+  CFLAGS="$CFLAGS -Werror -Wformat"
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 

configure.ac

@@ -1331,7 +1331,7 @@ if test "$GCC" = "yes"
 then
   AC_MSG_CHECKING(whether gcc supports ParseTuple __format__)
   save_CFLAGS=$CFLAGS
-  CFLAGS="$CFLAGS -Werror"
+  CFLAGS="$CFLAGS -Werror -Wformat"
   AC_COMPILE_IFELSE([
     AC_LANG_PROGRAM([[void f(char*,...)__attribute((format(PyArg_ParseTuple, 1, 2)));]], [[]])
   ],[

pyconfig.h.in

@@ -1187,9 +1187,6 @@
 /* Define if setpgrp() must be called as setpgrp(0, 0). */
 #undef SETPGRP_HAVE_ARG
 
-/* Define this to be extension of shared libraries (including the dot!). */
-#undef SHLIB_EXT
-
 /* Define if i>>j for signed int i does not extend the sign bit when i < 0 */
 #undef SIGNED_RIGHT_SHIFT_ZERO_FILLS