Add ATTRIBUTE_PRINTF attributes, and fix fallout

Fixes building gdb on x86_64-apple-darwin14 with clang, which produces
a number of warnings from -Wformat-nonliteral.

Ref: https://sourceware.org/ml/gdb/2015-02/msg00047.html

gdb/ChangeLog:
2015-02-26  Pedro Alves  <palves@redhat.com>

	* auto-load.h (file_is_auto_load_safe): Add ATTRIBUTE_PRINTF.
	* complaints.c (vcomplaint): Pass argument FMT directly to
	printf-like functions instead of complaint->fmt.
	* ctf.c (ctf_save_write_metadata): Add ATTRIBUTE_PRINTF.
	* darwin-nat.c (inferior_debug): Add ATTRIBUTE_PRINTF.
	* compile/compile-loc2c.c (pushf, unary, binary): Add
	ATTRIBUTE_PRINTF.
	(do_compile_dwarf_expr_to_c): Pass string literal as format string
	to pushf.
	(BINARY): Pass string literal as format string to 'binary'.
	* compile/compile-object-load.c (link_callbacks_einfo): Add
	ATTRIBUTE_PRINTF.
	* guile/guile-internal.h (gdbscm_printf): Add ATTRIBUTE_PRINTF.

9 files changed, 61 insertions, 13 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 1804b21..b3d8650 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,21 @@
 2015-02-26  Pedro Alves  <palves@redhat.com>
 
+	* auto-load.h (file_is_auto_load_safe): Add ATTRIBUTE_PRINTF.
+	* complaints.c (vcomplaint): Pass argument FMT directly to
+	printf-like functions instead of complaint->fmt.
+	* ctf.c (ctf_save_write_metadata): Add ATTRIBUTE_PRINTF.
+	* darwin-nat.c (inferior_debug): Add ATTRIBUTE_PRINTF.
+	* compile/compile-loc2c.c (pushf, unary, binary): Add
+	ATTRIBUTE_PRINTF.
+	(do_compile_dwarf_expr_to_c): Pass string literal as format string
+	to pushf.
+	(BINARY): Pass string literal as format string to 'binary'.
+	* compile/compile-object-load.c (link_callbacks_einfo): Add
+	ATTRIBUTE_PRINTF.
+	* guile/guile-internal.h (gdbscm_printf): Add ATTRIBUTE_PRINTF.
+
+2015-02-26  Pedro Alves  <palves@redhat.com>
+
 	* windows-termcap.c: Rename to ...
 	* stub-termcap.c: ... this.  Adjust header line.
 	* Makefile.in (SFILES): Refer to stub-termcap.c instead of
diff --git a/gdb/auto-load.h b/gdb/auto-load.h
index 1d10e91..d241946 100644
--- a/gdb/auto-load.h
+++ b/gdb/auto-load.h
@@ -45,7 +45,8 @@ extern struct cmd_list_element **auto_load_show_cmdlist_get (void);
 extern struct cmd_list_element **auto_load_info_cmdlist_get (void);
 
 extern int file_is_auto_load_safe (const char *filename,
-				   const char *debug_fmt, ...);
+				   const char *debug_fmt, ...)
+  ATTRIBUTE_PRINTF (2, 3);
 
 extern int auto_load_gdb_scripts_enabled
   (const struct extension_language_defn *extlang);
diff --git a/gdb/compile/compile-loc2c.c b/gdb/compile/compile-loc2c.c
index 3f43e58..6a3615d 100644
--- a/gdb/compile/compile-loc2c.c
+++ b/gdb/compile/compile-loc2c.c
@@ -443,6 +443,9 @@ push (int indent, struct ui_file *stream, ULONGEST l)
 /* Emit code to push an arbitrary expression.  This works like
    printf.  */
 
+static void pushf (int indent, struct ui_file *stream, const char *format, ...)
+  ATTRIBUTE_PRINTF (3, 4);
+
 static void
 pushf (int indent, struct ui_file *stream, const char *format, ...)
 {
@@ -460,6 +463,9 @@ pushf (int indent, struct ui_file *stream, const char *format, ...)
 /* Emit code for a unary expression -- one which operates in-place on
    the top-of-stack.  This works like printf.  */
 
+static void unary (int indent, struct ui_file *stream, const char *format, ...)
+  ATTRIBUTE_PRINTF (3, 4);
+
 static void
 unary (int indent, struct ui_file *stream, const char *format, ...)
 {
@@ -474,6 +480,8 @@ unary (int indent, struct ui_file *stream, const char *format, ...)
 
 /* Emit code for a unary expression -- one which uses the top two
    stack items, popping the topmost one.  This works like printf.  */
+static void binary (int indent, struct ui_file *stream, const char *format, ...)
+  ATTRIBUTE_PRINTF (3, 4);
 
 static void
 binary (int indent, struct ui_file *stream, const char *format, ...)
@@ -651,7 +659,7 @@ do_compile_dwarf_expr_to_c (int indent, struct ui_file *stream,
   fprintfi_filtered (indent, stream, "int __gdb_tos = -1;\n");
 
   if (initial != NULL)
-    pushf (indent, stream, core_addr_to_string (*initial));
+    pushf (indent, stream, "%s", core_addr_to_string (*initial));
 
   while (op_ptr < op_end)
     {
@@ -911,7 +919,8 @@ do_compile_dwarf_expr_to_c (int indent, struct ui_file *stream,
 
 	case DW_OP_pick:
 	  offset = *op_ptr++;
-	  pushf (indent, stream, "__gdb_stack[__gdb_tos - %d]", offset);
+	  pushf (indent, stream, "__gdb_stack[__gdb_tos - %s]",
+		 plongest (offset));
 	  break;
 
 	case DW_OP_swap:
@@ -1000,8 +1009,8 @@ do_compile_dwarf_expr_to_c (int indent, struct ui_file *stream,
 	  break;
 
 #define BINARY(OP)							\
-	  binary (indent, stream, ("__gdb_stack[__gdb_tos-1] " #OP	\
-				   " __gdb_stack[__gdb_tos]"));	\
+	  binary (indent, stream, "%s", "__gdb_stack[__gdb_tos-1] " #OP \
+				   " __gdb_stack[__gdb_tos]");	\
 	  break
 
 	case DW_OP_and:
@@ -1076,7 +1085,7 @@ do_compile_dwarf_expr_to_c (int indent, struct ui_file *stream,
 					    addr_size,
 					    cfa_start, cfa_end,
 					    &text_offset, per_cu);
-		pushf (indent, stream, cfa_name);
+		pushf (indent, stream, "%s", cfa_name);
 	      }
 	  }
 
diff --git a/gdb/compile/compile-object-load.c b/gdb/compile/compile-object-load.c
index e187970..8a7f232 100644
--- a/gdb/compile/compile-object-load.c
+++ b/gdb/compile/compile-object-load.c
@@ -224,6 +224,9 @@ link_callbacks_unattached_reloc (struct bfd_link_info *link_info,
 
 /* Helper for link_callbacks callbacks vector.  */
 
+static void link_callbacks_einfo (const char *fmt, ...)
+  ATTRIBUTE_PRINTF (1, 2);
+
 static void
 link_callbacks_einfo (const char *fmt, ...)
 {
diff --git a/gdb/complaints.c b/gdb/complaints.c
index 7e52656..dbacb2a 100644
--- a/gdb/complaints.c
+++ b/gdb/complaints.c
@@ -183,21 +183,27 @@ vcomplaint (struct complaints **c, const char *file,
   else
     series = complaints->series;
 
+  /* Pass 'fmt' instead of 'complaint->fmt' to printf-like callees
+     from here on, to avoid "format string is not a string literal"
+     warnings.  'fmt' is this function's printf-format parameter, so
+     the compiler can assume the passed in argument is a literal
+     string somewhere up the call chain.  */
+  gdb_assert (complaint->fmt == fmt);
+
   if (complaint->file != NULL)
-    internal_vwarning (complaint->file, complaint->line, 
-		       complaint->fmt, args);
+    internal_vwarning (complaint->file, complaint->line, fmt, args);
   else if (deprecated_warning_hook)
-    (*deprecated_warning_hook) (complaint->fmt, args);
+    (*deprecated_warning_hook) (fmt, args);
   else
     {
       if (complaints->explanation == NULL)
 	/* A [v]warning() call always appends a newline.  */
-	vwarning (complaint->fmt, args);
+	vwarning (fmt, args);
       else
 	{
 	  char *msg;
 	  struct cleanup *cleanups;
-	  msg = xstrvprintf (complaint->fmt, args);
+	  msg = xstrvprintf (fmt, args);
 	  cleanups = make_cleanup (xfree, msg);
 	  wrap_here ("");
 	  if (series != SUBSEQUENT_MESSAGE)
diff --git a/gdb/ctf.c b/gdb/ctf.c
index cf73ea0..9891321 100644
--- a/gdb/ctf.c
+++ b/gdb/ctf.c
@@ -102,6 +102,11 @@ struct trace_write_handler
 static void
 ctf_save_write_metadata (struct trace_write_handler *handler,
 			 const char *format, ...)
+  ATTRIBUTE_PRINTF (2, 3);
+
+static void
+ctf_save_write_metadata (struct trace_write_handler *handler,
+			 const char *format, ...)
 {
   va_list args;
 
diff --git a/gdb/darwin-nat.c b/gdb/darwin-nat.c
index f9481c7..dfce179 100644
--- a/gdb/darwin-nat.c
+++ b/gdb/darwin-nat.c
@@ -171,6 +171,9 @@ __attribute__ ((section ("__TEXT,__info_plist"),used)) =
   "</dict>\n"
   "</plist>\n";
 
+static void inferior_debug (int level, const char *fmt, ...)
+  ATTRIBUTE_PRINTF (2, 3);
+
 static void
 inferior_debug (int level, const char *fmt, ...)
 {
diff --git a/gdb/guile/guile-internal.h b/gdb/guile/guile-internal.h
index 9a8ef68..fe306b4 100644
--- a/gdb/guile/guile-internal.h
+++ b/gdb/guile/guile-internal.h
@@ -146,7 +146,8 @@ extern void gdbscm_define_functions (const scheme_function *, int public);
 extern void gdbscm_define_integer_constants (const scheme_integer_constant *,
 					     int public);
 
-extern void gdbscm_printf (SCM port, const char *format, ...);
+extern void gdbscm_printf (SCM port, const char *format, ...)
+  ATTRIBUTE_PRINTF (2, 3);
 
 extern void gdbscm_debug_display (SCM obj);
 
@@ -484,7 +485,8 @@ extern char *gdbscm_scm_to_c_string (SCM string);
 
 extern SCM gdbscm_scm_from_c_string (const char *string);
 
-extern SCM gdbscm_scm_from_printf (const char *format, ...);
+extern SCM gdbscm_scm_from_printf (const char *format, ...)
+    ATTRIBUTE_PRINTF (1, 2);
 
 extern char *gdbscm_scm_to_string (SCM string, size_t *lenp,
 				   const char *charset,
diff --git a/gdb/remote.c b/gdb/remote.c
index 3479140..3d2c1c2 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -6986,6 +6986,9 @@ remote_read_bytes (struct target_ops *ops, CORE_ADDR memaddr,
    FORMAT and the remaining arguments, then gets the reply.  Returns
    whether the packet was a success, a failure, or unknown.  */
 
+static enum packet_result remote_send_printf (const char *format, ...)
+  ATTRIBUTE_PRINTF (1, 2);
+
 static enum packet_result
 remote_send_printf (const char *format, ...)
 {