diff --git a/gcc/hwint.h b/gcc/hwint.h
index 38b7a14cbc1d7cf4a337c8058ca7d52809a75adc..e070e7d8dc22643fd19f280d998d5f268907a008 100644
--- a/gcc/hwint.h
+++ b/gcc/hwint.h
@@ -115,6 +115,27 @@ typedef HOST_WIDE_INT __gcc_host_wide_int__;
 #define HOST_WIDE_INT_PRINT_DOUBLE_HEX "0x%" PRIx64 "%016" PRIx64
 #define HOST_WIDE_INT_PRINT_PADDED_HEX "%016" PRIx64
 
+/* Similarly format modifier for printing size_t.  As not all hosts support
+   z modifier in printf, use GCC_PRISZ and cast argument to fmt_size_t.
+   So, instead of doing fprintf ("%zu\n", sizeof (x) * y); use
+   fprintf (HOST_SIZE_T_PRINT_UNSIGNED "\n",
+	    (fmt_size_t) (sizeof (x) * y));  */
+#if SIZE_MAX <= INT_MAX
+# define GCC_PRISZ ""
+# define fmt_size_t unsigned int
+#elif SIZE_MAX <= LONG_MAX
+# define GCC_PRISZ HOST_LONG_FORMAT
+# define fmt_size_t unsigned long int
+#else
+# define GCC_PRISZ HOST_LONG_LONG_FORMAT
+# define fmt_size_t unsigned long long int
+#endif
+
+#define HOST_SIZE_T_PRINT_DEC "%" GCC_PRISZ "d"
+#define HOST_SIZE_T_PRINT_UNSIGNED "%" GCC_PRISZ "u"
+#define HOST_SIZE_T_PRINT_HEX "%#" GCC_PRISZ "x"
+#define HOST_SIZE_T_PRINT_HEX_PURE "%" GCC_PRISZ "x"
+
 /* Define HOST_WIDEST_FAST_INT to the widest integer type supported
    efficiently in hardware.  (That is, the widest integer type that fits
    in a hardware register.)  Normally this is "long" but on some hosts it
diff --git a/gcc/ira-conflicts.cc b/gcc/ira-conflicts.cc
index 671b4e42b6f5fc290f75b8becf06ca1aed47ea42..83274c5333000770fa7276cd2efa51ec25b48130 100644
--- a/gcc/ira-conflicts.cc
+++ b/gcc/ira-conflicts.cc
@@ -115,10 +115,10 @@ build_conflict_bit_table (void)
 	    > (uint64_t) param_ira_max_conflict_table_size * 1024 * 1024)
 	  {
 	    if (internal_flag_ira_verbose > 0 && ira_dump_file != NULL)
-	      fprintf
-		(ira_dump_file,
-		 "+++Conflict table will be too big(>%dMB) -- don't use it\n",
-		 param_ira_max_conflict_table_size);
+	      fprintf (ira_dump_file,
+		       "+++Conflict table will be too big(>%dMB) "
+		       "-- don't use it\n",
+		       param_ira_max_conflict_table_size);
 	    return false;
 	  }
       }
@@ -148,11 +148,13 @@ build_conflict_bit_table (void)
 
   object_set_words = (ira_objects_num + IRA_INT_BITS - 1) / IRA_INT_BITS;
   if (internal_flag_ira_verbose > 0 && ira_dump_file != NULL)
-    fprintf
-      (ira_dump_file,
-       "+++Allocating %ld bytes for conflict table (uncompressed size %ld)\n",
-       (long) allocated_words_num * sizeof (IRA_INT_TYPE),
-       (long) object_set_words * ira_objects_num * sizeof (IRA_INT_TYPE));
+    fprintf (ira_dump_file,
+	     "+++Allocating " HOST_SIZE_T_PRINT_UNSIGNED
+	     " bytes for conflict table (uncompressed size "
+	     HOST_SIZE_T_PRINT_UNSIGNED ")\n",
+	     (fmt_size_t) (sizeof (IRA_INT_TYPE) * allocated_words_num),
+	     (fmt_size_t) (sizeof (IRA_INT_TYPE) * object_set_words
+			   * ira_objects_num));
 
   objects_live = sparseset_alloc (ira_objects_num);
   for (i = 0; i < ira_max_point; i++)