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1 /* Additional functions for the GCC driver on Darwin native.
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2 Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
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3 Contributed by Apple Computer Inc.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 GCC is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #ifndef CROSS_DIRECTORY_STRUCTURE
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22 #include "config.h"
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23 #include "system.h"
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24 #include "coretypes.h"
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25 #include "tm.h"
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26 #include "gcc.h"
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27 #include <sys/sysctl.h>
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28 #include "xregex.h"
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29
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30 #ifndef SWITCH_TAKES_ARG
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31 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
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32 #endif
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33
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34 #ifndef WORD_SWITCH_TAKES_ARG
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35 #define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
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36 #endif
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37
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38 /* When running on a Darwin system and using that system's headers and
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39 libraries, default the -mmacosx-version-min flag to be the version
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40 of the system on which the compiler is running. */
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41
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42 void
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43 darwin_default_min_version (int * argc_p, char *** argv_p)
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44 {
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45 const int argc = *argc_p;
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46 char ** const argv = *argv_p;
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47 int i;
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48 char osversion[32];
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49 size_t osversion_len = sizeof (osversion) - 1;
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50 static int osversion_name[2] = { CTL_KERN, KERN_OSRELEASE };
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51 char * version_p;
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52 char * version_pend;
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53 int major_vers;
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54 char minor_vers[6];
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55 static char new_flag[sizeof ("-mmacosx-version-min=10.0.0") + 6];
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56
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57 /* If the command-line is empty, just return. */
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58 if (argc <= 1)
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59 return;
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60 /* Don't do this if the user has specified -b or -V at the start
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61 of the command-line. */
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62 if (argv[1][0] == '-'
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63 && (argv[1][1] == 'V' ||
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64 ((argv[1][1] == 'b') && (NULL != strchr(argv[1] + 2,'-')))))
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65 return;
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66
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67 /* Don't do this if the user specified -mmacosx-version-min= or
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68 -mno-macosx-version-min. */
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69 for (i = 1; i < argc; i++)
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70 if (argv[i][0] == '-')
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71 {
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72 const char * const p = argv[i];
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73 if (strncmp (p, "-mno-macosx-version-min", 23) == 0
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74 || strncmp (p, "-mmacosx-version-min", 20) == 0)
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75 return;
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76
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77 /* It doesn't count if it's an argument to a different switch. */
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78 if (p[0] == '-'
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79 && ((SWITCH_TAKES_ARG (p[1]) > (p[2] != 0))
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80 || WORD_SWITCH_TAKES_ARG (p + 1)))
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81 i++;
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82 }
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83
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84 /* Retrieve the deployment target from the environment and insert
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85 it as a flag. */
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86 {
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87 const char * macosx_deployment_target;
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88 macosx_deployment_target = getenv ("MACOSX_DEPLOYMENT_TARGET");
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89 if (macosx_deployment_target
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90 /* Apparently, an empty string for MACOSX_DEPLOYMENT_TARGET means
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91 "use the default". Or, possibly "use 10.1". We choose
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92 to ignore the environment variable, as if it was never set. */
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93 && macosx_deployment_target[0])
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94 {
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95 ++*argc_p;
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96 *argv_p = XNEWVEC (char *, *argc_p);
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97 (*argv_p)[0] = argv[0];
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98 (*argv_p)[1] = concat ("-mmacosx-version-min=",
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99 macosx_deployment_target, NULL);
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100 memcpy (*argv_p + 2, argv + 1, (argc - 1) * sizeof (char *));
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101 return;
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102 }
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103 }
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104
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105 /* Determine the version of the running OS. If we can't, warn user,
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106 and do nothing. */
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107 if (sysctl (osversion_name, ARRAY_SIZE (osversion_name), osversion,
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108 &osversion_len, NULL, 0) == -1)
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109 {
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110 fprintf (stderr, "sysctl for kern.osversion failed: %s\n",
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111 xstrerror (errno));
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112 return;
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113 }
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114
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115 /* Try to parse the first two parts of the OS version number. Warn
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116 user and return if it doesn't make sense. */
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117 if (! ISDIGIT (osversion[0]))
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118 goto parse_failed;
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119 major_vers = osversion[0] - '0';
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120 version_p = osversion + 1;
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121 if (ISDIGIT (*version_p))
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122 major_vers = major_vers * 10 + (*version_p++ - '0');
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123 if (major_vers > 4 + 9)
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124 goto parse_failed;
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125 if (*version_p++ != '.')
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126 goto parse_failed;
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127 version_pend = strchr(version_p, '.');
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128 if (!version_pend)
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129 goto parse_failed;
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130 if (! ISDIGIT (*version_p))
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131 goto parse_failed;
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132 strncpy(minor_vers, version_p, version_pend - version_p);
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133 minor_vers[version_pend - version_p] = '\0';
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134
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135 /* The major kernel version number is 4 plus the second OS version
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136 component. */
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137 if (major_vers - 4 <= 4)
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138 /* On 10.4 and earlier, the old linker is used which does not
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139 support three-component system versions. */
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140 sprintf (new_flag, "-mmacosx-version-min=10.%d", major_vers - 4);
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141 else
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142 sprintf (new_flag, "-mmacosx-version-min=10.%d.%s", major_vers - 4,
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143 minor_vers);
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144
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145 /* Add the new flag. */
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146 ++*argc_p;
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147 *argv_p = XNEWVEC (char *, *argc_p);
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148 (*argv_p)[0] = argv[0];
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149 (*argv_p)[1] = new_flag;
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150 memcpy (*argv_p + 2, argv + 1, (argc - 1) * sizeof (char *));
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151 return;
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152
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153 parse_failed:
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154 fprintf (stderr, "couldn't understand kern.osversion `%.*s'\n",
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155 (int) osversion_len, osversion);
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156 return;
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157 }
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158
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159 #endif /* CROSS_DIRECTORY_STRUCTURE */
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