gcc/config/darwin-driver.c

   1 /* Additional functions for the GCC driver on Darwin native.
   2    Copyright (C) 2006-2013 Free Software Foundation, Inc.
   3    Contributed by Apple Computer Inc.
   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 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tm.h"
  25 #include "gcc.h"
  26 #include "opts.h"
  27
  28 #ifndef CROSS_DIRECTORY_STRUCTURE
  29 #include <sys/sysctl.h>
  30 #include "xregex.h"
  31
  32 static bool
  33 darwin_find_version_from_kernel (char *new_flag)
  34 {
  35   char osversion[32];
  36   size_t osversion_len = sizeof (osversion) - 1;
  37   static int osversion_name[2] = { CTL_KERN, KERN_OSRELEASE };
  38   int major_vers;
  39   char minor_vers[6];
  40   char * version_p;
  41   char * version_pend;
  42
  43   /* Determine the version of the running OS.  If we can't, warn user,
  44      and do nothing.  */
  45   if (sysctl (osversion_name, ARRAY_SIZE (osversion_name), osversion,
  46               &osversion_len, NULL, 0) == -1)
  47     {
  48       warning (0, "sysctl for kern.osversion failed: %m");
  49       return false;
  50     }
  51
  52   /* Try to parse the first two parts of the OS version number.  Warn
  53      user and return if it doesn't make sense.  */
  54   if (! ISDIGIT (osversion[0]))
  55     goto parse_failed;
  56   major_vers = osversion[0] - '0';
  57   version_p = osversion + 1;
  58   if (ISDIGIT (*version_p))
  59     major_vers = major_vers * 10 + (*version_p++ - '0');
  60   if (major_vers > 4 + 9)
  61     goto parse_failed;
  62   if (*version_p++ != '.')
  63     goto parse_failed;
  64   version_pend = strchr(version_p, '.');
  65   if (!version_pend)
  66     goto parse_failed;
  67   if (! ISDIGIT (*version_p))
  68     goto parse_failed;
  69   strncpy(minor_vers, version_p, version_pend - version_p);
  70   minor_vers[version_pend - version_p] = '\0';
  71
  72   /* The major kernel version number is 4 plus the second OS version
  73      component.  */
  74   if (major_vers - 4 <= 4)
  75     /* On 10.4 and earlier, the old linker is used which does not
  76        support three-component system versions.  */
  77     sprintf (new_flag, "10.%d", major_vers - 4);
  78   else
  79     sprintf (new_flag, "10.%d.%s", major_vers - 4,
  80              minor_vers);
  81
  82   return true;
  83
  84  parse_failed:
  85   warning (0, "couldn%'t understand kern.osversion %q.*s",
  86            (int) osversion_len, osversion);
  87   return false;
  88 }
  89
  90 #endif
  91
  92 /* When running on a Darwin system and using that system's headers and
  93    libraries, default the -mmacosx-version-min flag to be the version
  94    of the system on which the compiler is running.
  95
  96    When building cross or native cross compilers, default to the OSX
  97    version of the target (as provided by the most specific target header
  98    included in tm.h).  This may be overidden by setting the flag explicitly
  99    (or by the MACOSX_DEPLOYMENT_TARGET environment).  */
 100
 101 static void
 102 darwin_default_min_version (unsigned int *decoded_options_count,
 103                             struct cl_decoded_option **decoded_options)
 104 {
 105   const unsigned int argc = *decoded_options_count;
 106   struct cl_decoded_option *const argv = *decoded_options;
 107   unsigned int i;
 108   static char new_flag[sizeof ("10.0.0") + 6];
 109
 110   /* If the command-line is empty, just return.  */
 111   if (argc <= 1)
 112     return;
 113
 114   /* Don't do this if the user specified -mmacosx-version-min= or
 115      -mno-macosx-version-min.  */
 116   for (i = 1; i < argc; i++)
 117     if (argv[i].opt_index == OPT_mmacosx_version_min_)
 118       return;
 119
 120   /* Retrieve the deployment target from the environment and insert
 121      it as a flag.  */
 122   {
 123     const char * macosx_deployment_target;
 124     macosx_deployment_target = getenv ("MACOSX_DEPLOYMENT_TARGET");
 125     if (macosx_deployment_target
 126         /* Apparently, an empty string for MACOSX_DEPLOYMENT_TARGET means
 127            "use the default".  Or, possibly "use 10.1".  We choose
 128            to ignore the environment variable, as if it was never set.  */
 129         && macosx_deployment_target[0])
 130       {
 131         ++*decoded_options_count;
 132         *decoded_options = XNEWVEC (struct cl_decoded_option,
 133                                     *decoded_options_count);
 134         (*decoded_options)[0] = argv[0];
 135         generate_option (OPT_mmacosx_version_min_, macosx_deployment_target,
 136                          1, CL_DRIVER, &(*decoded_options)[1]);
 137         memcpy (*decoded_options + 2, argv + 1,
 138                 (argc - 1) * sizeof (struct cl_decoded_option));
 139         return;
 140       }
 141   }
 142
 143 #ifndef CROSS_DIRECTORY_STRUCTURE
 144
 145  /* Try to find the version from the kernel, if we fail - we print a message
 146     and give up.  */
 147  if (!darwin_find_version_from_kernel (new_flag))
 148    return;
 149
 150 #else
 151
 152  /* For cross-compilers, default to the target OS version. */
 153
 154  strncpy (new_flag, DEF_MIN_OSX_VERSION, sizeof (new_flag));
 155
 156 #endif /* CROSS_DIRECTORY_STRUCTURE */
 157
 158   /* Add the new flag.  */
 159   ++*decoded_options_count;
 160   *decoded_options = XNEWVEC (struct cl_decoded_option,
 161                               *decoded_options_count);
 162   (*decoded_options)[0] = argv[0];
 163   generate_option (OPT_mmacosx_version_min_, new_flag,
 164                    1, CL_DRIVER, &(*decoded_options)[1]);
 165   memcpy (*decoded_options + 2, argv + 1,
 166           (argc - 1) * sizeof (struct cl_decoded_option));
 167   return;
 168
 169 }
 170
 171 /* Translate -filelist and -framework options in *DECODED_OPTIONS
 172    (size *DECODED_OPTIONS_COUNT) to use -Xlinker so that they are
 173    considered to be linker inputs in the case that no other inputs are
 174    specified.  Handling these options in DRIVER_SELF_SPECS does not
 175    suffice because specs are too late to add linker inputs, and
 176    handling them in LINK_SPEC does not suffice because the linker will
 177    not be called if there are no other inputs.  When native, also
 178    default the -mmacosx-version-min flag.  */
 179
 180 void
 181 darwin_driver_init (unsigned int *decoded_options_count,
 182                     struct cl_decoded_option **decoded_options)
 183 {
 184   unsigned int i;
 185
 186   for (i = 1; i < *decoded_options_count; i++)
 187     {
 188       if ((*decoded_options)[i].errors & CL_ERR_MISSING_ARG)
 189         continue;
 190       switch ((*decoded_options)[i].opt_index)
 191         {
 192 #if DARWIN_X86
 193         case OPT_arch:
 194           if (!strcmp ((*decoded_options)[i].arg, "i386"))
 195             generate_option (OPT_m32, NULL, 1, CL_DRIVER, &(*decoded_options)[i]);
 196           else if (!strcmp ((*decoded_options)[i].arg, "x86_64"))
 197             generate_option (OPT_m64, NULL, 1, CL_DRIVER, &(*decoded_options)[i]);
 198           break;
 199 #endif
 200
 201         case OPT_filelist:
 202         case OPT_framework:
 203           ++*decoded_options_count;
 204           *decoded_options = XRESIZEVEC (struct cl_decoded_option,
 205                                          *decoded_options,
 206                                          *decoded_options_count);
 207           memmove (*decoded_options + i + 2,
 208                    *decoded_options + i + 1,
 209                    ((*decoded_options_count - i - 2)
 210                     * sizeof (struct cl_decoded_option)));
 211           generate_option (OPT_Xlinker, (*decoded_options)[i].arg, 1,
 212                            CL_DRIVER, &(*decoded_options)[i + 1]);
 213           generate_option (OPT_Xlinker,
 214                            (*decoded_options)[i].canonical_option[0], 1,
 215                            CL_DRIVER, &(*decoded_options)[i]);
 216           break;
 217
 218         default:
 219           break;
 220         }
 221     }
 222
 223   darwin_default_min_version (decoded_options_count, decoded_options);
 224 }