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1 /* Specific flags and argument handling of the C preprocessor.
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2 Copyright (C) 1999, 2007 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "tm.h"
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24 #include "gcc.h"
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25
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26 /* The `cpp' executable installed in $(bindir) and $(cpp_install_dir)
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27 is a customized version of the gcc driver. It forces -E; -S and -c
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28 are errors. It defaults to -x c for files with unrecognized
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29 extensions, unless -x options appear in argv, in which case we
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30 assume the user knows what they're doing. If no explicit input is
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31 mentioned, it will read stdin. */
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32
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33 #ifndef SWITCH_TAKES_ARG
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34 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
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35 #endif
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36
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37 #ifndef WORD_SWITCH_TAKES_ARG
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38 #define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
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39 #endif
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40
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41 /* Suffixes for known sorts of input files. Note that we do not list
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42 files which are normally considered to have been preprocessed already,
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43 since the user's expectation is that `cpp' always preprocesses. */
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44 static const char *const known_suffixes[] =
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45 {
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46 ".c", ".C", ".S", ".m",
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47 ".cc", ".cxx", ".cpp", ".cp", ".c++",
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48 ".sx",
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49 NULL
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50 };
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51
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52 /* Filter argc and argv before processing by the gcc driver proper. */
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53 void
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54 lang_specific_driver (int *in_argc, const char *const **in_argv,
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55 int *in_added_libraries ATTRIBUTE_UNUSED)
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56 {
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57 int argc = *in_argc;
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58 const char *const *argv = *in_argv;
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59
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60 /* Do we need to read stdin? */
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61 int read_stdin = 1;
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62
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63 /* Do we need to insert -E? */
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64 int need_E = 1;
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65
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66 /* Have we seen an input file? */
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67 int seen_input = 0;
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68
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69 /* Positions to insert -xc, -xassembler-with-cpp, and -o, if necessary.
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70 0 means unnecessary. */
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71 int lang_c_here = 0;
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72 int lang_S_here = 0;
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73 int o_here = 0;
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74
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75 /* Do we need to fix up an input file with an unrecognized suffix? */
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76 int need_fixups = 1;
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77
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78 int i, j, quote = 0;
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79 const char **new_argv;
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80 int new_argc;
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81 extern int is_cpp_driver;
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82
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83 is_cpp_driver = 1;
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84
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85 /* First pass. If we see an -S or -c, barf. If we see an input file,
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86 turn off read_stdin. If we see a second input file, it is actually
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87 the output file. If we see a third input file, barf. */
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88 for (i = 1; i < argc; i++)
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89 {
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90 if (quote == 1)
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91 {
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92 quote = 0;
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93 continue;
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94 }
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95
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96 if (argv[i][0] == '-')
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97 {
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98 if (argv[i][1] == '\0')
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99 read_stdin = 0;
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100 else if (argv[i][2] == '\0')
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101 {
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102 if (argv[i][1] == 'E')
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103 need_E = 0;
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104 else if (argv[i][1] == 'S' || argv[i][1] == 'c')
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105 {
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106 fatal ("\"%s\" is not a valid option to the preprocessor",
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107 argv[i]);
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108 return;
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109 }
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110 else if (argv[i][1] == 'x')
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111 {
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112 need_fixups = 0;
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113 quote = 1;
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114 }
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115 else if (SWITCH_TAKES_ARG (argv[i][1]))
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116 quote = 1;
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117 }
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118 else if (argv[i][1] == 'x')
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119 need_fixups = 0;
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120 else if (WORD_SWITCH_TAKES_ARG (&argv[i][1]))
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121 quote = 1;
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122 }
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123 else /* not an option */
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124 {
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125 seen_input++;
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126 if (seen_input == 3)
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127 {
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128 fatal ("too many input files");
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129 return;
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130 }
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131 else if (seen_input == 2)
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132 {
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133 o_here = i;
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134 }
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135 else
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136 {
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137 read_stdin = 0;
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138 if (need_fixups)
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139 {
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140 int l = strlen (argv[i]);
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141 int known = 0;
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142 const char *const *suff;
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143
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144 for (suff = known_suffixes; *suff; suff++)
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145 if (!strcmp (*suff, &argv[i][l - strlen(*suff)]))
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146 {
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147 known = 1;
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148 break;
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149 }
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150
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151 if (! known)
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152 {
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153 /* .s files are a special case; we have to treat
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154 them like .S files so -D__ASSEMBLER__ will be
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155 in effect. */
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156 if (!strcmp (".s", &argv[i][l - 2]))
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157 lang_S_here = i;
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158 else
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159 lang_c_here = i;
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160 }
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161 }
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162 }
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163 }
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164 }
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165
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166 /* If we don't need to edit the command line, we can bail early. */
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167
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168 new_argc = argc + need_E + read_stdin
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169 + !!o_here + !!lang_c_here + !!lang_S_here;
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170
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171 if (new_argc == argc)
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172 return;
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173
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174 /* One more slot for a terminating null. */
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175 new_argv = XNEWVEC (const char *, new_argc + 1);
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176
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177 new_argv[0] = argv[0];
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178 j = 1;
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179
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180 if (need_E)
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181 new_argv[j++] = "-E";
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182
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183 for (i = 1; i < argc; i++, j++)
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184 {
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185 if (i == lang_c_here)
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186 new_argv[j++] = "-xc";
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187 else if (i == lang_S_here)
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188 new_argv[j++] = "-xassembler-with-cpp";
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189 else if (i == o_here)
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190 new_argv[j++] = "-o";
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191
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192 new_argv[j] = argv[i];
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193 }
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194
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195 if (read_stdin)
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196 new_argv[j++] = "-";
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197
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198 new_argv[j] = NULL;
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199 *in_argc = new_argc;
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200 *in_argv = new_argv;
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201 }
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202
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203 /* Called before linking. Returns 0 on success and -1 on failure. */
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204 int lang_specific_pre_link (void)
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205 {
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206 return 0; /* Not used for cpp. */
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207 }
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208
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209 /* Number of extra output files that lang_specific_pre_link may generate. */
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210 int lang_specific_extra_outfiles = 0; /* Not used for cpp. */
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