Removing -Wno-format from kernel makefiles, 1/16

[Stefan Fritsch]

add support for %td for ptrdiff_t in kernel

this also adds support in gcc 4.x kprintf
---
 gnu/gcc/gcc/c-format.c |    7 ++++---
 sys/kern/subr_prf.c    |    6 ++++++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git gnu/gcc/gcc/c-format.c gnu/gcc/gcc/c-format.c
index b9eecee..1b1734b 100644
--- gnu/gcc/gcc/c-format.c
+++ gnu/gcc/gcc/c-format.c
@@ -325,6 +325,7 @@ static const format_length_info kprintf_length_specs[] =
   { "l", FMT_LEN_l, STD_C89, "ll", FMT_LEN_ll, STD_C9L },
   { "q", FMT_LEN_ll, STD_EXT, NULL, 0, 0 },
   { "z", FMT_LEN_z, STD_C99, NULL, 0, 0 },
+  { "t", FMT_LEN_t, STD_C99, NULL, 0, 0 },
   { NULL, 0, 0, NULL, 0, 0 }
 };
 
@@ -552,9 +553,9 @@ static const format_char_info asm_fprintf_char_table[] =
 static const format_char_info kprint_char_table[] = 
 { 
   /* C89 conversion specifiers.  */ 
-  { "di",  0, STD_C89, { T89_I,   BADLEN, T89_S,   T89_L,   T9L_LL,  BADLEN,  
T99_SST, BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN }, "-wp0 +'I", "i", NULL }, 
-  { "oxX", 0, STD_C89, { T89_UI,  BADLEN, T89_US,  T89_UL,  T9L_ULL, BADLEN,  
T99_ST,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN }, "-wp0#",    "i", NULL }, 
-  { "u",   0, STD_C89, { T89_UI,  BADLEN, T89_US,  T89_UL,  T9L_ULL, BADLEN,  
T99_ST,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN }, "-wp0'I",   "i", NULL }, 
+  { "di",  0, STD_C89, { T89_I,   BADLEN, T89_S,   T89_L,   T9L_LL,  BADLEN,  
T99_SST, T99_PD,  BADLEN,  BADLEN,  BADLEN,  BADLEN }, "-wp0 +'I", "i", NULL }, 
+  { "oxX", 0, STD_C89, { T89_UI,  BADLEN, T89_US,  T89_UL,  T9L_ULL, BADLEN,  
T99_ST,  T99_UPD,  BADLEN,  BADLEN,  BADLEN,  BADLEN }, "-wp0#",    "i", NULL 
}, 
+  { "u",   0, STD_C89, { T89_UI,  BADLEN, T89_US,  T89_UL,  T9L_ULL, BADLEN,  
T99_ST,  T99_UPD,  BADLEN,  BADLEN,  BADLEN,  BADLEN }, "-wp0'I",   "i", NULL 
}, 
   { "c",   0, STD_C89, { T89_I,   BADLEN, BADLEN,  BADLEN,  BADLEN,  BADLEN,  
BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN }, "-w",       "", NULL }, 
   { "s",   1, STD_C89, { T89_C,   BADLEN, BADLEN,  BADLEN,  BADLEN,  BADLEN,  
BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN }, "-wp",      "cR", NULL 
}, 
   { "p",   1, STD_C89, { T89_V,   BADLEN, BADLEN,  T89_UL,  T9L_LL,  BADLEN,  
BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN,  BADLEN }, "-wp0",     "c", NULL }, 
diff --git sys/kern/subr_prf.c sys/kern/subr_prf.c
index 768d164..c940141 100644
--- sys/kern/subr_prf.c
+++ sys/kern/subr_prf.c
@@ -842,6 +842,12 @@ reswitch:  switch (ch) {
                        size = 1;
                        sign = '\0';
                        break;
+               case 't':
+                       {
+                               /* assume ptrdiff_t is long */
+                               CTASSERT(sizeof(fmt - fmt0) == sizeof(long));
+                       }
+                       /* FALLTHROUGH */
                case 'D':
                        flags |= LONGINT;
                        /*FALLTHROUGH*/