Bug#29125 Windows Server X64: so many compiler warnings

- Remove bothersome warning messages.  This change focuses on the warnings 
that are covered by the ignore file: support-files/compiler_warnings.supp.
- Strings are guaranteed to be max uint in length

strings/ctype-mb.c

@@ -37,7 +37,7 @@ uint my_caseup_str_mb(CHARSET_INFO * cs, char *str)
       str++;
     }
   }
-  return str - str_orig;
+  return (uint) (str - str_orig);
 }
 
 uint my_casedn_str_mb(CHARSET_INFO * cs, char *str)
@@ -57,7 +57,7 @@ uint my_casedn_str_mb(CHARSET_INFO * cs, char *str)
       str++;
     }
   }
-  return str - str_orig;
+  return (uint) (str - str_orig);
 }
 
 uint my_caseup_mb(CHARSET_INFO * cs, char *src, uint srclen,

strings/ctype-simple.c

@@ -193,7 +193,7 @@ uint my_caseup_str_8bit(CHARSET_INFO * cs,char *str)
   char *str_orig= str;
   while ((*str= (char) map[(uchar) *str]) != 0)
     str++;
-  return str - str_orig;
+  return (uint) (str - str_orig);
 }
 
 
@@ -203,7 +203,7 @@ uint my_casedn_str_8bit(CHARSET_INFO * cs,char *str)
   char *str_orig= str;
   while ((*str= (char) map[(uchar) *str]) != 0)
     str++;
-  return str - str_orig;
+  return (uint) (str - str_orig);
 }
 
 
@@ -1516,7 +1516,7 @@ my_strntoull10rnd_8bit(CHARSET_INFO *cs __attribute__((unused)),
     }
   }
   
-  digits= str - beg;
+  digits= (int) (str - beg);
 
   /* Continue to accumulate into ulonglong */
   for (dot= NULL, ull= ul; str < end; str++)
@@ -1553,7 +1553,7 @@ my_strntoull10rnd_8bit(CHARSET_INFO *cs __attribute__((unused)),
       }
       else
       {
-        shift= dot - str;
+        shift= (int) (dot - str);
         for ( ; str < end && (ch= (unsigned char) (*str - '0')) < 10; str++);
       }
       goto exp;
@@ -1577,7 +1577,7 @@ my_strntoull10rnd_8bit(CHARSET_INFO *cs __attribute__((unused)),
     /* Unknown character, exit the loop */
     break; 
   }
-  shift= dot ? dot - str : 0; /* Right shift */
+  shift= dot ? (int) (dot - str) : 0; /* Right shift */
   addon= 0;
 
 exp:    /* [ E [ <sign> ] <unsigned integer> ] */

strings/ctype-ucs2.c

@@ -1001,7 +1001,7 @@ ulonglong my_strntoull10rnd_ucs2(CHARSET_INFO *cs __attribute__((unused)),
     *b++= (char) wc;
   }
 
-  res= my_strntoull10rnd_8bit(cs, buf, b - buf, unsign_fl, endptr, err);
+  res= my_strntoull10rnd_8bit(cs, buf, (uint) (b - buf), unsign_fl, endptr, err);
   *endptr= (char*) nptr + 2 * (uint) (*endptr- buf);
   return res;
 }

strings/my_vsnprintf.c

@@ -107,7 +107,7 @@ int my_vsnprintf(char *to, size_t n, const char* fmt, va_list ap)
       char *par = va_arg(ap, char *);
       DBUG_ASSERT(to <= end);
       if (to + abs(width) + 1 > end)
-        width= end - to - 1;  /* sign doesn't matter */
+        width= (uint) (end - to - 1);  /* sign doesn't matter */
       memmove(to, par, abs(width));
       to+= width;
       continue;

strings/xml.c

@@ -147,7 +147,7 @@ static int my_xml_enter(MY_XML_PARSER *st, const char *str, uint len)
   memcpy(st->attrend,str,len);
   st->attrend+=len;
   st->attrend[0]='\0';
-  return st->enter ?  st->enter(st,st->attr,st->attrend-st->attr) : MY_XML_OK;
+  return st->enter ?  st->enter(st,st->attr, (uint) (st->attrend - st->attr)) : MY_XML_OK;
 }
 
 
@@ -179,7 +179,7 @@ static int my_xml_leave(MY_XML_PARSER *p, const char *str, uint slen)
     return MY_XML_ERROR;
   }
   
-  rc = p->leave_xml ?  p->leave_xml(p,p->attr,p->attrend-p->attr) : MY_XML_OK;
+  rc = p->leave_xml ?  p->leave_xml(p,p->attr, (uint) (p->attrend - p->attr)) : MY_XML_OK;
   
   *e='\0';
   p->attrend=e;