gcc/config/avr/driver-avr.c

   1 /* Subroutines for the gcc driver.
   2    Copyright (C) 2009-2017 Free Software Foundation, Inc.
   3    Contributed by Georg-Johann Lay <avr@gjlay.de>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #define IN_TARGET_CODE 1
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "diagnostic.h"
  27 #include "tm.h"
  28
  29 // Remove -nodevicelib from the command line if not needed
  30 #define X_NODEVLIB "%<nodevicelib"
  31
  32 static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
  33
  34
  35 /* Implement spec function `device-specs-file´.
  36
  37    Validate mcu name given with -mmcu option. Compose
  38    -specs=<specs-file-name>%s. If everything went well then argv[0] is the
  39    inflated (absolute) first device-specs directory and argv[1] is a device
  40    or core name as supplied by -mmcu=*. When building GCC the path might be
  41    relative.  */
  42
  43 const char*
  44 avr_devicespecs_file (int argc, const char **argv)
  45 {
  46   const char *mmcu = NULL;
  47
  48 #ifdef DEBUG_SPECS
  49   if (verbose_flag)
  50     fnotice (stderr, "Running spec function '%s' with %d args\n\n",
  51              __FUNCTION__, argc);
  52 #endif
  53
  54   switch (argc)
  55     {
  56     case 0:
  57       fatal_error (input_location,
  58                    "bad usage of spec function %qs", "device-specs-file");
  59       return X_NODEVLIB;
  60
  61     case 1:
  62       if (strcmp ("device-specs", argv[0]) == 0)
  63         {
  64           /* FIXME:  This means "device-specs%s" from avr.h:DRIVER_SELF_SPECS
  65              has not been resolved to a path.  That case can occur when the
  66              c++ testsuite is run from the build directory.  DejaGNU's
  67              libgloss.exp:get_multilibs runs $compiler without -B, i.e.runs
  68              xgcc without specifying a prefix.  Without any prefix, there is
  69              no means to find out where the specs files might be located.
  70              get_multilibs runs xgcc --print-multi-lib, hence we don't actually
  71              need information form a specs file and may skip it here.  */
  72           return X_NODEVLIB;
  73         }
  74
  75       mmcu = AVR_MMCU_DEFAULT;
  76       break;
  77
  78     default:
  79       mmcu = argv[1];
  80
  81       // Allow specifying the same MCU more than once.
  82
  83       for (int i = 2; i < argc; i++)
  84         if (strcmp (mmcu, argv[i]) != 0)
  85           {
  86             error ("specified option %qs more than once", "-mmcu");
  87             return X_NODEVLIB;
  88           }
  89
  90       break;
  91     }
  92
  93   // Filter out silly -mmcu= arguments like "foo bar".
  94
  95   for (const char *s = mmcu; *s; s++)
  96     if (!ISALNUM (*s)
  97         && '-' != *s
  98         && '_' != *s)
  99       {
 100         error ("strange device name %qs after %qs: bad character %qc",
 101                mmcu, "-mmcu=", *s);
 102         return X_NODEVLIB;
 103       }
 104
 105   return concat ("-specs=device-specs", dir_separator_str, "specs-",
 106                  mmcu, "%s"
 107 #if defined (WITH_AVRLIBC)
 108                  " %{mmcu=avr*:" X_NODEVLIB "} %{!mmcu=*:" X_NODEVLIB "}",
 109 #else
 110                  " " X_NODEVLIB,
 111 #endif
 112                  NULL);
 113 }