--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/avr/gen-avr-mmcu-texi.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,144 @@
+/* Copyright (C) 2012-2017 Free Software Foundation, Inc.
+   Contributed by Georg-Johann Lay (avr@gjlay.de)
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+   
+   GCC is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#define IN_GEN_AVR_MMCU_TEXI
+
+#include "avr-devices.c"
+
+static const char*
+mcu_name[sizeof avr_mcu_types / sizeof avr_mcu_types[0]];
+
+static int letter (char c)
+{
+  return c >= 'a' && c <= 'z';
+}
+
+static int digit (char c)
+{
+  return c >= '0' && c <= '9';
+}
+
+static int
+comparator (const void *va, const void *vb)
+{
+  const char *a = *(const char* const*) va;
+  const char *b = *(const char* const*) vb;
+
+  while (*a && *b)
+    {
+      /* Make letters smaller than digits so that `atmega16a' follows
+         `atmega16' without `atmega161' etc. between them.  */
+      
+      if (letter (*a) && digit (*b))
+        return -1;
+
+      if (digit (*a) && letter (*b))
+        return 1;
+
+      if (*a != *b)
+        return *a - *b;
+      
+      a++;
+      b++;
+    }
+
+  return *a - *b;
+} 
+
+static void
+print_mcus (size_t n_mcus)
+{
+  int duplicate = 0;
+  size_t i;
+    
+  if (!n_mcus)
+    return;
+    
+  qsort (mcu_name, n_mcus, sizeof (char*), comparator);
+
+  printf ("@*@var{mcu}@tie{}=");
+
+  for (i = 0; i < n_mcus; i++)
+    {
+      printf (" @code{%s}%s", mcu_name[i], i == n_mcus-1 ? ".\n\n" : ",");
+
+      if (i && !strcmp (mcu_name[i], mcu_name[i-1]))
+        {
+          /* Sanity-check: Fail on devices that are present more than once.  */
+
+          duplicate = 1;
+          fprintf (stderr, "error: duplicate device: %s\n", mcu_name[i]);
+        }
+    }
+
+  if (duplicate)
+    exit (1);
+}
+
+int main (void)
+{
+  enum avr_arch_id arch_id = ARCH_UNKNOWN;
+  size_t i, n_mcus = 0;
+  const avr_mcu_t *mcu;
+
+  printf ("@c Copyright (C) 2012-2017 Free Software Foundation, Inc.\n");
+  printf ("@c This is part of the GCC manual.\n");
+  printf ("@c For copying conditions, see the file "
+          "gcc/doc/include/fdl.texi.\n\n");
+
+  printf ("@c This file is generated automatically using\n");
+  printf ("@c gcc/config/avr/gen-avr-mmcu-texi.c from:\n");
+  printf ("@c    gcc/config/avr/avr-arch.h\n");
+  printf ("@c    gcc/config/avr/avr-devices.c\n");
+  printf ("@c    gcc/config/avr/avr-mcus.def\n\n");
+
+  printf ("@c Please do not edit manually.\n\n");
+
+  printf ("@table @code\n\n");
+
+  for (mcu = avr_mcu_types; mcu->name; mcu++)
+    {
+      if (mcu->macro == NULL)
+        {
+          arch_id = mcu->arch_id;
+
+          /* Start a new architecture:  Flush the MCUs collected so far.  */
+
+          print_mcus (n_mcus);
+          n_mcus = 0;
+
+          for (i = 0; i < sizeof (avr_texinfo) / sizeof (*avr_texinfo); i++)
+            if (arch_id == avr_texinfo[i].arch_id)
+              printf ("@item %s\n%s\n", mcu->name, avr_texinfo[i].texinfo);
+        }
+      else if (arch_id == (enum avr_arch_id) mcu->arch_id)
+        {
+          mcu_name[n_mcus++] = mcu->name;
+        }
+    }
+
+  print_mcus (n_mcus);
+  printf ("@end table\n");
+
+  return EXIT_SUCCESS;
+}