gcc/config/darwin-driver.c

   1 /* Additional functions for the GCC driver on Darwin native.
   2    Copyright (C) 2006-2017 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 "libiberty.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "opts.h"
  27 #include "diagnostic-core.h"
  28
  29 #ifndef CROSS_DIRECTORY_STRUCTURE
  30 #include <sys/sysctl.h>
  31 #include "xregex.h"
  32
  33 static char *
  34 darwin_find_version_from_kernel (void)
  35 {
  36   char osversion[32];
  37   size_t osversion_len = sizeof (osversion) - 1;
  38   static int osversion_name[2] = { CTL_KERN, KERN_OSRELEASE };
  39   int major_vers;
  40   char * version_p;
  41   char * new_flag;
  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 NULL;
  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 (*version_p++ != '.')
  61     goto parse_failed;
  62
  63   /* The major kernel version number is 4 plus the second OS version
  64      component.  */
  65   if (major_vers - 4 <= 4)
  66     /* On 10.4 and earlier, the old linker is used which does not
  67        support three-component system versions.
  68        FIXME: we should not assume this - a newer linker could be used.  */
  69     asprintf (&new_flag, "10.%d", major_vers - 4);
  70   else
  71     /* Although the newer linker supports three-component system
  72        versions, there's no guarantee that the minor version component
  73        of the kernel and the system are the same. Apple's clang always
  74        uses 0 as the minor version: do the same.  */
  75     asprintf (&new_flag, "10.%d.0", major_vers - 4);
  76
  77   return new_flag;
  78
  79  parse_failed:
  80   warning (0, "couldn%'t understand kern.osversion %q.*s",
  81            (int) osversion_len, osversion);
  82   return NULL;
  83 }
  84 #endif
  85
  86 /* When running on a Darwin system and using that system's headers and
  87    libraries, default the -mmacosx-version-min flag to be the version
  88    of the system on which the compiler is running.
  89
  90    When building cross or native cross compilers, default to the OSX
  91    version of the target (as provided by the most specific target header
  92    included in tm.h).  This may be overidden by setting the flag explicitly
  93    (or by the MACOSX_DEPLOYMENT_TARGET environment).  */
  94
  95 static const char *
  96 darwin_default_min_version (void)
  97 {
  98   /* Try to retrieve the deployment target from the environment.  */
  99   const char *new_flag = getenv ("MACOSX_DEPLOYMENT_TARGET");
 100
 101   /* Apparently, an empty string for MACOSX_DEPLOYMENT_TARGET means
 102      "use the default".  Or, possibly "use 10.1".  We choose
 103      to ignore the environment variable, as if it was never set.  */
 104   if (new_flag == NULL || new_flag[0] == 0)
 105 #ifndef CROSS_DIRECTORY_STRUCTURE
 106     /* Try to find the version from the kernel, if we fail - we print a
 107        message and give up.  */
 108     new_flag = darwin_find_version_from_kernel ();
 109 #else
 110     /* For cross-compilers, default to a minimum version determined by
 111        the configuration. */
 112     new_flag = DEF_MIN_OSX_VERSION;
 113 #endif /* CROSS_DIRECTORY_STRUCTURE */
 114
 115   if (new_flag != NULL)
 116     {
 117       size_t len = strlen (new_flag);
 118       if (len > 128) { /* Arbitrary limit, number should be like xx.yy.zz */
 119         warning (0, "couldn%'t understand version %s\n", new_flag);
 120         return NULL;
 121       }
 122       new_flag = xstrndup (new_flag, len);
 123     }
 124   return new_flag;
 125 }
 126
 127 /* Translate -filelist and -framework options in *DECODED_OPTIONS
 128    (size *DECODED_OPTIONS_COUNT) to use -Xlinker so that they are
 129    considered to be linker inputs in the case that no other inputs are
 130    specified.  Handling these options in DRIVER_SELF_SPECS does not
 131    suffice because specs are too late to add linker inputs, and
 132    handling them in LINK_SPEC does not suffice because the linker will
 133    not be called if there are no other inputs.  When native, also
 134    default the -mmacosx-version-min flag.  */
 135
 136 void
 137 darwin_driver_init (unsigned int *decoded_options_count,
 138                     struct cl_decoded_option **decoded_options)
 139 {
 140   unsigned int i;
 141   bool seenX86 = false;
 142   bool seenX86_64 = false;
 143   bool seenPPC = false;
 144   bool seenPPC64 = false;
 145   bool seenM32 = false;
 146   bool seenM64 = false;
 147   bool appendM32 = false;
 148   bool appendM64 = false;
 149   const char *vers_string = NULL;
 150   bool seen_version_min = false;
 151
 152   for (i = 1; i < *decoded_options_count; i++)
 153     {
 154       if ((*decoded_options)[i].errors & CL_ERR_MISSING_ARG)
 155         continue;
 156
 157       switch ((*decoded_options)[i].opt_index)
 158         {
 159         case OPT_arch:
 160           /* Support provision of a single -arch xxxx flag as a means of
 161              specifying the sub-target/multi-lib.  Translate this into -m32/64
 162              as appropriate.  */
 163           if (!strcmp ((*decoded_options)[i].arg, "i386"))
 164             seenX86 = true;
 165           else if (!strcmp ((*decoded_options)[i].arg, "x86_64"))
 166             seenX86_64 = true;
 167           else if (!strcmp ((*decoded_options)[i].arg, "ppc"))
 168             seenPPC = true;
 169           else if (!strcmp ((*decoded_options)[i].arg, "ppc64"))
 170             seenPPC64 = true;
 171           else
 172             error ("this compiler does not support %s",
 173                    (*decoded_options)[i].arg);
 174           /* Now we've examined it, drop the -arch arg.  */
 175           if (*decoded_options_count > i) {
 176             memmove (*decoded_options + i,
 177                      *decoded_options + i + 1,
 178                      ((*decoded_options_count - i)
 179                       * sizeof (struct cl_decoded_option)));
 180           }
 181           --i;
 182           --*decoded_options_count;
 183           break;
 184
 185         case OPT_m32:
 186           seenM32 = true;
 187           break;
 188
 189         case OPT_m64:
 190           seenM64 = true;
 191           break;
 192
 193         case OPT_filelist:
 194         case OPT_framework:
 195           ++*decoded_options_count;
 196           *decoded_options = XRESIZEVEC (struct cl_decoded_option,
 197                                          *decoded_options,
 198                                          *decoded_options_count);
 199           memmove (*decoded_options + i + 2,
 200                    *decoded_options + i + 1,
 201                    ((*decoded_options_count - i - 2)
 202                     * sizeof (struct cl_decoded_option)));
 203           generate_option (OPT_Xlinker, (*decoded_options)[i].arg, 1,
 204                            CL_DRIVER, &(*decoded_options)[i + 1]);
 205           generate_option (OPT_Xlinker,
 206                            (*decoded_options)[i].canonical_option[0], 1,
 207                            CL_DRIVER, &(*decoded_options)[i]);
 208           break;
 209
 210         case OPT_mmacosx_version_min_:
 211           seen_version_min = true;
 212           vers_string = xstrndup ((*decoded_options)[i].arg, 32);
 213
 214         default:
 215           break;
 216         }
 217     }
 218
 219   /* Turn -arch xxxx into the appropriate -m32/-m64 flag.
 220      If the User tried to specify multiple arch flags (which is possible with
 221      some Darwin compilers) warn that this mode is not supported by this
 222      compiler (and ignore the arch flags, which means that the default multi-
 223      lib will be generated).  */
 224   /* TODO: determine if these warnings would better be errors.  */
 225 #if DARWIN_X86
 226   if (seenPPC || seenPPC64)
 227     warning (0, "this compiler does not support PowerPC (arch flags ignored)");
 228   if (seenX86)
 229     {
 230       if (seenX86_64 || seenM64)
 231         warning (0, "%s conflicts with i386 (arch flags ignored)",
 232                 (seenX86_64? "x86_64": "m64"));
 233       else if (! seenM32) /* Add -m32 if the User didn't. */
 234         appendM32 = true;
 235     }
 236   else if (seenX86_64)
 237     {
 238       if (seenX86 || seenM32)
 239         warning (0, "%s conflicts with x86_64 (arch flags ignored)",
 240                  (seenX86? "i386": "m32"));
 241       else if (! seenM64) /* Add -m64 if the User didn't. */
 242         appendM64 = true;
 243     }
 244 #elif DARWIN_PPC
 245   if (seenX86 || seenX86_64)
 246     warning (0, "this compiler does not support X86 (arch flags ignored)");
 247   if (seenPPC)
 248     {
 249       if (seenPPC64 || seenM64)
 250         warning (0, "%s conflicts with ppc (arch flags ignored)",
 251                  (seenPPC64? "ppc64": "m64"));
 252       else if (! seenM32) /* Add -m32 if the User didn't. */
 253         appendM32 = true;
 254     }
 255   else if (seenPPC64)
 256     {
 257       if (seenPPC || seenM32)
 258         warning (0, "%s conflicts with ppc64 (arch flags ignored)",
 259                  (seenPPC? "ppc": "m32"));
 260       else if (! seenM64) /* Add -m64 if the User didn't. */
 261         appendM64 = true;
 262     }
 263 #endif
 264
 265   if (appendM32 || appendM64)
 266     {
 267       ++*decoded_options_count;
 268       *decoded_options = XRESIZEVEC (struct cl_decoded_option,
 269                                      *decoded_options,
 270                                      *decoded_options_count);
 271       generate_option (appendM32 ? OPT_m32 : OPT_m64, NULL, 1, CL_DRIVER,
 272                        &(*decoded_options)[*decoded_options_count - 1]);
 273     }
 274
 275   /* We will need to know the OS X version we're trying to build for here
 276      so that we can figure out the mechanism and source for the sysroot to
 277      be used.  */
 278   if (! seen_version_min && *decoded_options_count > 1)
 279     {
 280       /* Not set by the User, try to figure it out.  */
 281       vers_string = darwin_default_min_version ();
 282       if (vers_string != NULL)
 283         {
 284           ++*decoded_options_count;
 285           *decoded_options = XRESIZEVEC (struct cl_decoded_option,
 286                                          *decoded_options,
 287                                          *decoded_options_count);
 288           generate_option (OPT_mmacosx_version_min_, vers_string, 1, CL_DRIVER,
 289                           &(*decoded_options)[*decoded_options_count - 1]);
 290         }
 291     }
 292   /* Create and push the major version for assemblers that need it.  */
 293   if (vers_string != NULL)
 294     {
 295       char *asm_major = NULL;
 296       const char *first_period = strchr(vers_string, '.');
 297       if (first_period != NULL)
 298         {
 299           const char *second_period = strchr(first_period+1, '.');
 300           if (second_period  != NULL)
 301             asm_major = xstrndup (vers_string, second_period-vers_string);
 302           else
 303             asm_major = xstrdup (vers_string);
 304         }
 305       /* Else we appear to have a weird macosx version with no major number.
 306          Punt on this for now.  */
 307       if (asm_major != NULL)
 308         {
 309           ++*decoded_options_count;
 310           *decoded_options = XRESIZEVEC (struct cl_decoded_option,
 311                                          *decoded_options,
 312                                          *decoded_options_count);
 313           generate_option (OPT_asm_macosx_version_min_, asm_major, 1, CL_DRIVER,
 314                           &(*decoded_options)[*decoded_options_count - 1]);
 315         }
 316     }
 317 }