add -Wold-style-definition

This adds -Wold-style-definition to gdb's list of warnings.  This
found a couple of spots where "()" was used where "(void)" is more
correct.

Tested by rebuilding on x86-64 Fedora 18.

	* configure.ac (build_warnings): Add -Wold-style-definition.
	* configure: Rebuild.
	* machoread.c (_initialize_machoread): Use "(void)".
	* macrocmd.c (macro_inform_no_debuginfo): Fix formatting;
	use "(void)".

gdb/ChangeLog

@@ -1,3 +1,11 @@
+2013-07-01  Tom Tromey  <tromey@redhat.com>
+
+	* configure.ac (build_warnings): Add -Wold-style-definition.
+	* configure: Rebuild.
+	* machoread.c (_initialize_machoread): Use "(void)".
+	* macrocmd.c (macro_inform_no_debuginfo): Fix formatting;
+	use "(void)".
+
 2013-07-01  Tom Tromey  <tromey@redhat.com>
 
 	* configure.ac (build_warnings): Add -Wold-style-declaration.

gdb/configure

@@ -12471,7 +12471,7 @@ build_warnings="-Wall -Wdeclaration-after-statement -Wpointer-arith \
 -Wno-unused -Wunused-value -Wunused-function \
 -Wno-switch -Wno-char-subscripts -Wmissing-prototypes \
 -Wdeclaration-after-statement -Wempty-body -Wmissing-parameter-type \
--Wold-style-declaration"
+-Wold-style-declaration -Wold-style-definition"
 
 # Enable -Wno-format by default when using gcc on mingw since many
 # GCC versions complain about %I64.

gdb/configure.ac

@@ -1941,7 +1941,7 @@ build_warnings="-Wall -Wdeclaration-after-statement -Wpointer-arith \
 -Wno-unused -Wunused-value -Wunused-function \
 -Wno-switch -Wno-char-subscripts -Wmissing-prototypes \
 -Wdeclaration-after-statement -Wempty-body -Wmissing-parameter-type \
--Wold-style-declaration"
+-Wold-style-declaration -Wold-style-definition"
 
 # Enable -Wno-format by default when using gcc on mingw since many
 # GCC versions complain about %I64.

gdb/machoread.c

@@ -1037,7 +1037,7 @@ static const struct sym_fns macho_sym_fns = {
 extern initialize_file_ftype _initialize_machoread;
 
 void
-_initialize_machoread ()
+_initialize_machoread (void)
 {
   add_symtab_fns (&macho_sym_fns);
 

gdb/macrocmd.c

@@ -47,7 +47,8 @@ macro_command (char *arg, int from_tty)
 
 
 /* Prints an informational message regarding the lack of macro information.  */
-static void macro_inform_no_debuginfo()
+static void
+macro_inform_no_debuginfo (void)
 {
   puts_filtered ("GDB has no preprocessor macro information for that code.\n");
 }