c-common.h (enum c_tree_index): Add CTI_SIGNED_SIZE_TYPE and CTI_UNSIGNED_PTRDIFF_TYPE.

	* c-common.h (enum c_tree_index): Add CTI_SIGNED_SIZE_TYPE and
	CTI_UNSIGNED_PTRDIFF_TYPE.
	(signed_size_type_node): Define.
	(unsigned_ptrdiff_type_node): Define.
	* c-decl.c (init_decl_processing): Create the
	signed_size_type_node and unsigned_ptrdiff_type_node types.
	* c-common.c (T_SC): Define.
	(T_SST): Define.
	(T_UPD): Define.
	(print_char_table): Use T_SST for %zd, %zi, %zn.  Use T_UPD for
	%to, %tu, %tx, %tX.  Allow %hhn (T_SC).  Add "c" to the flags for
	%s and %p.
	(scan_char_table): Use T_SC for %hhd, %hhi, %hhn.  Use T_SST for
	%zd, %zi, %zn.  Use T_UPD for %to, %tu, %tx, %tX.  Add "c" to the
	flags for %c, %s and %[.
	(check_format_info): Only allow leniency for signedness of targets
	of character pointers (when pedantic) for formats flagged with
	"c", so for strings but not for %hh formats.  When pedantic, don't
	allow character pointers to substitute for void pointers if a
	second level of indirection is present.

testsuite:
	* gcc.dg/c99-printf-1.c: New test.

From-SVN: r35530

6 files changed, 271 insertions, 17 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 580c70f..3c28983 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,26 @@
+2000-08-06  Joseph S. Myers  <jsm28@cam.ac.uk>
+
+	* c-common.h (enum c_tree_index): Add CTI_SIGNED_SIZE_TYPE and
+	CTI_UNSIGNED_PTRDIFF_TYPE.
+	(signed_size_type_node): Define.
+	(unsigned_ptrdiff_type_node): Define.
+	* c-decl.c (init_decl_processing): Create the
+	signed_size_type_node and unsigned_ptrdiff_type_node types.
+	* c-common.c (T_SC): Define.
+	(T_SST): Define.
+	(T_UPD): Define.
+	(print_char_table): Use T_SST for %zd, %zi, %zn.  Use T_UPD for
+	%to, %tu, %tx, %tX.  Allow %hhn (T_SC).  Add "c" to the flags for
+	%s and %p.
+	(scan_char_table): Use T_SC for %hhd, %hhi, %hhn.  Use T_SST for
+	%zd, %zi, %zn.  Use T_UPD for %to, %tu, %tx, %tX.  Add "c" to the
+	flags for %c, %s and %[.
+	(check_format_info): Only allow leniency for signedness of targets
+	of character pointers (when pedantic) for formats flagged with
+	"c", so for strings but not for %hh formats.  When pedantic, don't
+	allow character pointers to substitute for void pointers if a
+	second level of indirection is present.
+
 2000-08-06  Kazu Hirata  <kazu@hxi.com>
 
 	* invoke.texi (Options for Debugging Your Program or GCC): Update
diff --git a/gcc/c-common.c b/gcc/c-common.c
index 64df897..b72f8f1 100644
--- a/gcc/c-common.c
+++ b/gcc/c-common.c
@@ -1190,12 +1190,15 @@ strip_attrs (specs_attrs)
 #define T_D	&double_type_node
 #define T_LD	&long_double_type_node
 #define T_C	&char_type_node
+#define T_SC	&signed_char_type_node
 #define T_UC	&unsigned_char_type_node
 #define T_V	&void_type_node
 #define T_W	&wchar_type_node
 #define T_WI	&wint_type_node
 #define T_ST    &sizetype
+#define T_SST   &signed_size_type_node
 #define T_PD    &ptrdiff_type_node
+#define T_UPD   &unsigned_ptrdiff_type_node
 #define T_IM    NULL /* intmax_t not yet implemented.  */
 #define T_UIM   NULL /* uintmax_t not yet implemented.  */
 
@@ -1233,33 +1236,33 @@ typedef struct {
 } format_char_info;
 
 static format_char_info print_char_table[] = {
-  { "di",	0,	T_I,	T_I,	T_I,	T_L,	T_LL,	T_LL,	T_ST,	T_PD,	T_IM,	"-wp0 +'"	},
-  { "oxX",	0,	T_UI,	T_UI,	T_UI,	T_UL,	T_ULL,	T_ULL,	T_ST,	T_PD,	T_UIM,	"-wp0#"		},
-  { "u",	0,	T_UI,	T_UI,	T_UI,	T_UL,	T_ULL,	T_ULL,	T_ST,	T_PD,	T_UIM,	"-wp0'"		},
+  { "di",	0,	T_I,	T_I,	T_I,	T_L,	T_LL,	T_LL,	T_SST,	T_PD,	T_IM,	"-wp0 +'"	},
+  { "oxX",	0,	T_UI,	T_UI,	T_UI,	T_UL,	T_ULL,	T_ULL,	T_ST,	T_UPD,	T_UIM,	"-wp0#"		},
+  { "u",	0,	T_UI,	T_UI,	T_UI,	T_UL,	T_ULL,	T_ULL,	T_ST,	T_UPD,	T_UIM,	"-wp0'"		},
 /* A GNU extension.  */
   { "m",	0,	T_V,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	"-wp"		},
   { "fFgG",	0,	T_D,	NULL,	NULL,	T_D,	NULL,	T_LD,	NULL,	NULL,	NULL,	"-wp0 +#'"	},
   { "eEaA",	0,	T_D,	NULL,	NULL,	T_D,	NULL,	T_LD,	NULL,	NULL,	NULL,	"-wp0 +#"	},
   { "c",	0,	T_I,	NULL,	NULL,	T_WI,	NULL,	NULL,	NULL,	NULL,	NULL,	"-w"		},
   { "C",	0,	T_WI,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	"-w"		},
-  { "s",	1,	T_C,	NULL,	NULL,	T_W,	NULL,	NULL,	NULL,	NULL,	NULL,	"-wp"		},
+  { "s",	1,	T_C,	NULL,	NULL,	T_W,	NULL,	NULL,	NULL,	NULL,	NULL,	"-wpc"		},
   { "S",	1,	T_W,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	"-wp"		},
-  { "p",	1,	T_V,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	"-w"		},
-  { "n",	1,	T_I,	NULL,	T_S,	T_L,	T_LL,	NULL,	T_ST,	T_PD,	T_IM,	""		},
+  { "p",	1,	T_V,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	"-wc"		},
+  { "n",	1,	T_I,	T_SC,	T_S,	T_L,	T_LL,	NULL,	T_SST,	T_PD,	T_IM,	""		},
   { NULL,	0,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL		}
 };
 
 static format_char_info scan_char_table[] = {
-  { "di",	1,	T_I,	T_C,	T_S,	T_L,	T_LL,	T_LL,	T_ST,	T_PD,	T_IM,	"*"	},
-  { "ouxX",	1,	T_UI,	T_UC,	T_US,	T_UL,	T_ULL,	T_ULL,	T_ST,	T_PD,	T_UIM,	"*"	},
+  { "di",	1,	T_I,	T_SC,	T_S,	T_L,	T_LL,	T_LL,	T_SST,	T_PD,	T_IM,	"*"	},
+  { "ouxX",	1,	T_UI,	T_UC,	T_US,	T_UL,	T_ULL,	T_ULL,	T_ST,	T_UPD,	T_UIM,	"*"	},
   { "efFgEGaA",	1,	T_F,	NULL,	NULL,	T_D,	NULL,	T_LD,	NULL,	NULL,	NULL,	"*"	},
-  { "c",	1,	T_C,	NULL,	NULL,	T_W,	NULL,	NULL,	NULL,	NULL,	NULL,	"*"	},
-  { "s",	1,	T_C,	NULL,	NULL,	T_W,	NULL,	NULL,	NULL,	NULL,	NULL,	"*a"	},
-  { "[",	1,	T_C,	NULL,	NULL,	T_W,	NULL,	NULL,	NULL,	NULL,	NULL,	"*a"	},
+  { "c",	1,	T_C,	NULL,	NULL,	T_W,	NULL,	NULL,	NULL,	NULL,	NULL,	"*c"	},
+  { "s",	1,	T_C,	NULL,	NULL,	T_W,	NULL,	NULL,	NULL,	NULL,	NULL,	"*ac"	},
+  { "[",	1,	T_C,	NULL,	NULL,	T_W,	NULL,	NULL,	NULL,	NULL,	NULL,	"*ac"	},
   { "C",	1,	T_W,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	"*"	},
   { "S",	1,	T_W,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	"*a"	},
   { "p",	2,	T_V,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	"*"	},
-  { "n",	1,	T_I,	T_C,	T_S,	T_L,	T_LL,	NULL,	T_ST,	T_PD,	T_IM,	""	},
+  { "n",	1,	T_I,	T_SC,	T_S,	T_L,	T_LL,	NULL,	T_SST,	T_PD,	T_IM,	""	},
   { NULL,	0,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL,	NULL	}
 };
 
@@ -2074,8 +2077,10 @@ check_format_info (info, params)
 		      || (DECL_P (cur_param) && TREE_READONLY (cur_param))))))
 	warning ("writing into constant object (arg %d)", arg_num);
 
-      /* Check whether the argument type is a character type.  */
-      if (TREE_CODE (cur_type) != ERROR_MARK)
+      /* Check whether the argument type is a character type.  This leniency
+	 only applies to certain formats, flagged with 'c'.
+      */
+      if (TREE_CODE (cur_type) != ERROR_MARK && index (fci->flag_chars, 'c') != 0)
 	char_type_flag = (TYPE_MAIN_VARIANT (cur_type) == char_type_node
 			  || TYPE_MAIN_VARIANT (cur_type) == signed_char_type_node
 			  || TYPE_MAIN_VARIANT (cur_type) == unsigned_char_type_node);
@@ -2093,7 +2098,7 @@ check_format_info (info, params)
 		&& fci->pointer_count > 0
 		&& (! pedantic
 		    || TYPE_MAIN_VARIANT (cur_type) == void_type_node
-		    || char_type_flag))
+		    || (i == 1 && char_type_flag)))
 	  /* Don't warn about differences merely in signedness, unless
 	     -pedantic.  With -pedantic, warn if the type is a pointer
 	     target and not a character type, and for character types at
@@ -2109,8 +2114,7 @@ check_format_info (info, params)
 	     equivalent but the above test won't consider them equivalent.  */
 	  && ! (wanted_type == char_type_node
 		&& (! pedantic || i < 2)
-		&& (TYPE_MAIN_VARIANT (cur_type) == signed_char_type_node
-		    || TYPE_MAIN_VARIANT (cur_type) == unsigned_char_type_node)))
+		&& char_type_flag))
 	{
 	  register const char *this;
 	  register const char *that;
diff --git a/gcc/c-common.h b/gcc/c-common.h
index 9033a3a..50823df 100644
--- a/gcc/c-common.h
+++ b/gcc/c-common.h
@@ -92,6 +92,8 @@ enum c_tree_index
     CTI_SIGNED_WCHAR_TYPE,
     CTI_UNSIGNED_WCHAR_TYPE,
     CTI_WINT_TYPE,
+    CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
+    CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
     CTI_WIDEST_INT_LIT_TYPE,
     CTI_WIDEST_UINT_LIT_TYPE,
 
@@ -124,6 +126,8 @@ enum c_tree_index
 #define signed_wchar_type_node		c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 #define unsigned_wchar_type_node	c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 #define wint_type_node			c_global_trees[CTI_WINT_TYPE]
+#define signed_size_type_node		c_global_trees[CTI_SIGNED_SIZE_TYPE]
+#define unsigned_ptrdiff_type_node	c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 
diff --git a/gcc/c-decl.c b/gcc/c-decl.c
index 6d08dfc..1f773d9 100644
--- a/gcc/c-decl.c
+++ b/gcc/c-decl.c
@@ -3003,6 +3003,7 @@ init_decl_processing ()
      Note that stddef.h uses `unsigned long',
      and this must agree, even if long and int are the same size.  */
   t = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
+  signed_size_type_node = signed_type (t);
   if (flag_traditional && TREE_UNSIGNED (t))
     t = signed_type (t);
     
@@ -3086,6 +3087,7 @@ init_decl_processing ()
     = build_function_type (integer_type_node, NULL_TREE);
   ptrdiff_type_node
     = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
+  unsigned_ptrdiff_type_node = unsigned_type (ptrdiff_type_node);
 
   c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
 
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 3581df5..ac887f6 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,9 @@
 2000-08-06  Joseph S. Myers  <jsm28@cam.ac.uk>
 
+	* gcc.dg/c99-printf-1.c: New test.
+
+2000-08-06  Joseph S. Myers  <jsm28@cam.ac.uk>
+
 	* gcc.c-torture/execute/20000801-4.x: Only xfail on x86.
 
 2000-08-05  Zack Weinberg  <zack@wolery.cumb.org>
diff --git a/gcc/testsuite/gcc.dg/c99-printf-1.c b/gcc/testsuite/gcc.dg/c99-printf-1.c
new file mode 100644
index 0000000..2e69399
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/c99-printf-1.c
@@ -0,0 +1,217 @@
+/* Test for printf formats.  Formats using C99 features, including cases
+   where C99 specifies some aspect of the format to be ignored or where
+   the behaviour is undefined.
+*/
+/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
+/* { dg-do compile } */
+/* { dg-options "-std=iso9899:1999 -pedantic -Wformat" } */
+
+typedef __WCHAR_TYPE__ wchar_t;
+typedef __WINT_TYPE__ wint_t;
+typedef __SIZE_TYPE__ size_t;
+typedef __PTRDIFF_TYPE__ ptrdiff_t;
+
+/* Kludge to get signed type corresponding to size_t.  */
+#define unsigned signed
+typedef __SIZE_TYPE__ signed_size_t;
+#undef unsigned
+
+/* These next definitions are broken.  When GCC has a <stdint.h> and
+   an internal understanding of intmax_t and uintmax_t, they should be
+   replaced by an include of <stdint.h> or by definitions for internal
+   macros or typedefs, and the corresponding xfails removed.
+*/
+typedef long long int intmax_t;
+typedef unsigned long long int uintmax_t;
+
+extern int printf (const char *, ...);
+
+#define NULL ((void *)0)
+
+void
+foo (int i, unsigned int u, double d, char *s, void *p, int *n,
+     long double ld, wint_t lc, wchar_t *ls, long long int ll,
+     unsigned long long int ull, signed char *ss, unsigned char *us,
+     long long int *lln, intmax_t j, uintmax_t uj, intmax_t *jn,
+     size_t z, signed_size_t sz, signed_size_t *zn,
+     ptrdiff_t t, ptrdiff_t *tn)
+{
+  /* See ISO/IEC 9899:1999 (E) subclause 7.19.6.1 (pages 273-281).
+     We do not repeat here most of the checks for correct C90 formats
+     or completely broken formats.
+  */
+  /* Valid and invalid %h, %hh, %l, %ll, %j, %z, %t, %L constructions.  */
+  printf ("%hf", d); /* { dg-warning "length character" "bad use of %h" } */
+  printf ("%hF", d); /* { dg-warning "length character" "bad use of %h" } */
+  printf ("%he", d); /* { dg-warning "length character" "bad use of %h" } */
+  printf ("%hE", d); /* { dg-warning "length character" "bad use of %h" } */
+  printf ("%hg", d); /* { dg-warning "length character" "bad use of %h" } */
+  printf ("%hG", d); /* { dg-warning "length character" "bad use of %h" } */
+  printf ("%ha", d); /* { dg-warning "length character" "bad use of %h" } */
+  printf ("%hA", d); /* { dg-warning "length character" "bad use of %h" } */
+  printf ("%hc", i); /* { dg-warning "length character" "bad use of %h" } */
+  printf ("%hs", s); /* { dg-warning "length character" "bad use of %h" } */
+  printf ("%hp", p); /* { dg-warning "length character" "bad use of %h" } */
+  printf ("%hhd%hhi%hho%hhu%hhx%hhX", i, i, u, u, u, u);
+  printf ("%hhn", ss);
+  printf ("%hhf", d); /* { dg-warning "length character" "bad use of %hh" } */
+  printf ("%hhF", d); /* { dg-warning "length character" "bad use of %hh" } */
+  printf ("%hhe", d); /* { dg-warning "length character" "bad use of %hh" } */
+  printf ("%hhE", d); /* { dg-warning "length character" "bad use of %hh" } */
+  printf ("%hhg", d); /* { dg-warning "length character" "bad use of %hh" } */
+  printf ("%hhG", d); /* { dg-warning "length character" "bad use of %hh" } */
+  printf ("%hha", d); /* { dg-warning "length character" "bad use of %hh" } */
+  printf ("%hhA", d); /* { dg-warning "length character" "bad use of %hh" } */
+  printf ("%hhc", i); /* { dg-warning "length character" "bad use of %hh" } */
+  printf ("%hhs", s); /* { dg-warning "length character" "bad use of %hh" } */
+  printf ("%hhp", p); /* { dg-warning "length character" "bad use of %hh" } */
+  printf ("%lc", lc);
+  printf ("%ls", ls);
+  printf ("%lf%lF%le%lE%lg%lG%la%lA", d, d, d, d, d, d, d, d);
+  printf ("%lp", p); /* { dg-warning "length character|C" "bad use of %l" } */
+  printf ("%lld%lli%llo%llu%llx%llX", ll, ll, ull, ull, ull, ull);
+  printf ("%lln", lln);
+  printf ("%llf", d); /* { dg-warning "length character" "bad use of %ll" } */
+  printf ("%llF", d); /* { dg-warning "length character" "bad use of %ll" } */
+  printf ("%lle", d); /* { dg-warning "length character" "bad use of %ll" } */
+  printf ("%llE", d); /* { dg-warning "length character" "bad use of %ll" } */
+  printf ("%llg", d); /* { dg-warning "length character" "bad use of %ll" } */
+  printf ("%llG", d); /* { dg-warning "length character" "bad use of %ll" } */
+  printf ("%lla", d); /* { dg-warning "length character" "bad use of %ll" } */
+  printf ("%llA", d); /* { dg-warning "length character" "bad use of %ll" } */
+  printf ("%llc", i); /* { dg-warning "length character" "bad use of %ll" } */
+  printf ("%lls", s); /* { dg-warning "length character" "bad use of %ll" } */
+  printf ("%llp", p); /* { dg-warning "length character" "bad use of %ll" } */
+  printf ("%jd%ji%jo%ju%jx%jX", j, j, uj, uj, uj, uj); /* { dg-bogus "length character" "bogus %j warning" { xfail *-*-* } } */
+  printf ("%jn", jn); /* { dg-bogus "length character" "bogus %j warning" { xfail *-*-* } } */
+  printf ("%jf", d); /* { dg-warning "length character" "bad use of %j" } */
+  printf ("%jF", d); /* { dg-warning "length character" "bad use of %j" } */
+  printf ("%je", d); /* { dg-warning "length character" "bad use of %j" } */
+  printf ("%jE", d); /* { dg-warning "length character" "bad use of %j" } */
+  printf ("%jg", d); /* { dg-warning "length character" "bad use of %j" } */
+  printf ("%jG", d); /* { dg-warning "length character" "bad use of %j" } */
+  printf ("%ja", d); /* { dg-warning "length character" "bad use of %j" } */
+  printf ("%jA", d); /* { dg-warning "length character" "bad use of %j" } */
+  printf ("%jc", i); /* { dg-warning "length character" "bad use of %j" } */
+  printf ("%js", s); /* { dg-warning "length character" "bad use of %j" } */
+  printf ("%jp", p); /* { dg-warning "length character" "bad use of %j" } */
+  printf ("%zd%zi%zo%zu%zx%zX", sz, sz, z, z, z, z);
+  printf ("%zn", zn);
+  printf ("%zf", d); /* { dg-warning "length character" "bad use of %z" } */
+  printf ("%zF", d); /* { dg-warning "length character" "bad use of %z" } */
+  printf ("%ze", d); /* { dg-warning "length character" "bad use of %z" } */
+  printf ("%zE", d); /* { dg-warning "length character" "bad use of %z" } */
+  printf ("%zg", d); /* { dg-warning "length character" "bad use of %z" } */
+  printf ("%zG", d); /* { dg-warning "length character" "bad use of %z" } */
+  printf ("%za", d); /* { dg-warning "length character" "bad use of %z" } */
+  printf ("%zA", d); /* { dg-warning "length character" "bad use of %z" } */
+  printf ("%zc", i); /* { dg-warning "length character" "bad use of %z" } */
+  printf ("%zs", s); /* { dg-warning "length character" "bad use of %z" } */
+  printf ("%zp", p); /* { dg-warning "length character" "bad use of %z" } */
+  printf ("%td%ti%to%tu%tx%tX", t, t, t, t, t, t);
+  printf ("%tn", tn);
+  printf ("%tf", d); /* { dg-warning "length character" "bad use of %t" } */
+  printf ("%tF", d); /* { dg-warning "length character" "bad use of %t" } */
+  printf ("%te", d); /* { dg-warning "length character" "bad use of %t" } */
+  printf ("%tE", d); /* { dg-warning "length character" "bad use of %t" } */
+  printf ("%tg", d); /* { dg-warning "length character" "bad use of %t" } */
+  printf ("%tG", d); /* { dg-warning "length character" "bad use of %t" } */
+  printf ("%ta", d); /* { dg-warning "length character" "bad use of %t" } */
+  printf ("%tA", d); /* { dg-warning "length character" "bad use of %t" } */
+  printf ("%tc", i); /* { dg-warning "length character" "bad use of %t" } */
+  printf ("%ts", s); /* { dg-warning "length character" "bad use of %t" } */
+  printf ("%tp", p); /* { dg-warning "length character" "bad use of %t" } */
+  printf ("%Le%LE%Lf%LF%Lg%LG%La%LA", ld, ld, ld, ld, ld, ld, ld, ld);
+  /* These next six are accepted by GCC as referring to long long,
+     but -pedantic correctly warns.
+  */
+  printf ("%Ld", ll); /* { dg-warning "does not support" "bad use of %L" } */
+  printf ("%Li", ll); /* { dg-warning "does not support" "bad use of %L" } */
+  printf ("%Lo", ull); /* { dg-warning "does not support" "bad use of %L" } */
+  printf ("%Lu", ull); /* { dg-warning "does not support" "bad use of %L" } */
+  printf ("%Lx", ull); /* { dg-warning "does not support" "bad use of %L" } */
+  printf ("%LX", ull); /* { dg-warning "does not support" "bad use of %L" } */
+  printf ("%Lc", i); /* { dg-warning "length character" "bad use of %L" } */
+  printf ("%Ls", s); /* { dg-warning "length character" "bad use of %L" } */
+  printf ("%Lp", p); /* { dg-warning "length character" "bad use of %L" } */
+  printf ("%Ln", n); /* { dg-warning "length character" "bad use of %L" } */
+  /* Valid uses of each bare conversion.  */
+  printf ("%d%i%o%u%x%X%f%F%e%E%g%G%a%A%c%s%p%n%%", i, i, u, u, u, u,
+	  d, d, d, d, d, d, d, d, i, s, p, n);
+  /* Uses of the - flag (valid on all non-%, non-n conversions).  */
+  printf ("%-d%-i%-o%-u%-x%-X%-f%-F%-e%-E%-g%-G%-a%-A%-c%-s%-p", i, i,
+	  u, u, u, u, d, d, d, d, d, d, d, d, i, s, p);
+  printf ("%-n", n); /* { dg-warning "flag" "bad use of %-n" } */
+  /* Uses of the + flag (valid on signed conversions only).  */
+  printf ("%+d%+i%+f%+F%+e%+E%+g%+G%+a%+A\n", i, i, d, d, d, d, d, d, d, d);
+  printf ("%+o", u); /* { dg-warning "flag" "bad use of + flag" } */
+  printf ("%+u", u); /* { dg-warning "flag" "bad use of + flag" } */
+  printf ("%+x", u); /* { dg-warning "flag" "bad use of + flag" } */
+  printf ("%+X", u); /* { dg-warning "flag" "bad use of + flag" } */
+  printf ("%+c", i); /* { dg-warning "flag" "bad use of + flag" } */
+  printf ("%+s", s); /* { dg-warning "flag" "bad use of + flag" } */
+  printf ("%+p", p); /* { dg-warning "flag" "bad use of + flag" } */
+  printf ("%+n", n); /* { dg-warning "flag" "bad use of + flag" } */
+  /* Uses of the space flag (valid on signed conversions only, and ignored
+     with +).
+  */
+  printf ("% +d", i); /* { dg-warning "use of both" "use of space and + flags" } */
+  printf ("%+ d", i); /* { dg-warning "use of both" "use of space and + flags" } */
+  printf ("% d% i% f% F% e% E% g% G% a% A\n", i, i, d, d, d, d, d, d, d, d);
+  printf ("% o", u); /* { dg-warning "flag" "bad use of space flag" } */
+  printf ("% u", u); /* { dg-warning "flag" "bad use of space flag" } */
+  printf ("% x", u); /* { dg-warning "flag" "bad use of space flag" } */
+  printf ("% X", u); /* { dg-warning "flag" "bad use of space flag" } */
+  printf ("% c", i); /* { dg-warning "flag" "bad use of space flag" } */
+  printf ("% s", s); /* { dg-warning "flag" "bad use of space flag" } */
+  printf ("% p", p); /* { dg-warning "flag" "bad use of space flag" } */
+  printf ("% n", n); /* { dg-warning "flag" "bad use of space flag" } */
+  /* Uses of the # flag.  */
+  printf ("%#o%#x%#X%#e%#E%#f%#F%#g%#G%#a%#A", u, u, u, d, d, d, d,
+	  d, d, d, d);
+  printf ("%#d", i); /* { dg-warning "flag" "bad use of # flag" } */
+  printf ("%#i", i); /* { dg-warning "flag" "bad use of # flag" } */
+  printf ("%#u", u); /* { dg-warning "flag" "bad use of # flag" } */
+  printf ("%#c", i); /* { dg-warning "flag" "bad use of # flag" } */
+  printf ("%#s", s); /* { dg-warning "flag" "bad use of # flag" } */
+  printf ("%#p", p); /* { dg-warning "flag" "bad use of # flag" } */
+  printf ("%#n", n); /* { dg-warning "flag" "bad use of # flag" } */
+  /* Uses of the 0 flag.  */
+  printf ("%08d%08i%08o%08u%08x%08X%08e%08E%08f%08F%08g%08G%08a%08A", i, i,
+	  u, u, u, u, d, d, d, d, d, d, d, d);
+  printf ("%0c", i); /* { dg-warning "flag" "bad use of 0 flag" } */
+  printf ("%0s", s); /* { dg-warning "flag" "bad use of 0 flag" } */
+  printf ("%0p", p); /* { dg-warning "flag" "bad use of 0 flag" } */
+  printf ("%0n", n); /* { dg-warning "flag" "bad use of 0 flag" } */
+  /* 0 flag ignored with precision for certain types, not others.  */
+  printf ("%08.5d", i); /* { dg-warning "ignored" "0 flag ignored with precision" } */
+  printf ("%08.5i", i); /* { dg-warning "ignored" "0 flag ignored with precision" } */
+  printf ("%08.5o", u); /* { dg-warning "ignored" "0 flag ignored with precision" } */
+  printf ("%08.5u", u); /* { dg-warning "ignored" "0 flag ignored with precision" } */
+  printf ("%08.5x", u); /* { dg-warning "ignored" "0 flag ignored with precision" } */
+  printf ("%08.5X", u); /* { dg-warning "ignored" "0 flag ignored with precision" } */
+  printf ("%08.5f%08.5F%08.5e%08.5E%08.5g%08.5G%08.5a%08.5A",
+	  d, d, d, d, d, d, d, d);
+  /* 0 flag ignored with - flag.  */
+  printf ("%-08d", i); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08i", i); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08o", u); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08u", u); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08x", u); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08X", u); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08e", d); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08E", d); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08f", d); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08F", d); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08g", d); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08G", d); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08a", d); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  printf ("%-08A", d); /* { dg-warning "flags" "0 flag ignored with - flag" } */
+  /* Various tests of bad argument types.  Mostly covered in c90-printf-1.c;
+     here just test for pointer target sign with %hhn.  (Probably allowed
+     by the standard, but a bad idea, so GCC should diagnose if what
+     is used is not signed char *.)
+  */
+  printf ("%hhn", s); /* { dg-warning "format" "%hhn plain char" } */
+  printf ("%hhn", us); /* { dg-warning "format" "%hhn unsigned char" } */
+}