1 /* Specific flags and argument handling of the C preprocessor. 2 Copyright (C) 1999, 2007, 2010, 2011 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it under 7 the terms of the GNU General Public License as published by the Free 8 Software Foundation; either version 3, or (at your option) any later 9 version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 #include "config.h" 21 #include "system.h" 22 #include "coretypes.h" 23 #include "tm.h" 24 #include "gcc.h" 25 #include "opts.h" 26 27 /* The `cpp' executable installed in $(bindir) and $(cpp_install_dir) 28 is a customized version of the gcc driver. It forces -E; -S and -c 29 are errors. It defaults to -x c for files with unrecognized 30 extensions, unless -x options appear in argv, in which case we 31 assume the user knows what they're doing. If no explicit input is 32 mentioned, it will read stdin. */ 33 34 /* Suffixes for known sorts of input files. Note that we do not list 35 files which are normally considered to have been preprocessed already, 36 since the user's expectation is that `cpp' always preprocesses. */ 37 static const char *const known_suffixes[] = 38 { 39 ".c", ".C", ".S", ".m", 40 ".cc", ".cxx", ".cpp", ".cp", ".c++", 41 ".sx", 42 NULL 43 }; 44 45 /* Filter the command line before processing by the gcc driver proper. */ 46 void 47 lang_specific_driver (struct cl_decoded_option **in_decoded_options, 48 unsigned int *in_decoded_options_count, 49 int *in_added_libraries ATTRIBUTE_UNUSED) 50 { 51 struct cl_decoded_option *decoded_options = *in_decoded_options; 52 unsigned int argc = *in_decoded_options_count; 53 54 /* Do we need to read stdin? */ 55 int read_stdin = 1; 56 57 /* Do we need to insert -E? */ 58 int need_E = 1; 59 60 /* Have we seen an input file? */ 61 int seen_input = 0; 62 63 /* Positions to insert -xc, -xassembler-with-cpp, and -o, if necessary. 64 0 means unnecessary. */ 65 unsigned int lang_c_here = 0; 66 unsigned int lang_S_here = 0; 67 unsigned int o_here = 0; 68 69 /* Do we need to fix up an input file with an unrecognized suffix? */ 70 int need_fixups = 1; 71 72 unsigned int i, j; 73 struct cl_decoded_option *new_decoded_options; 74 unsigned int new_argc; 75 extern int is_cpp_driver; 76 77 is_cpp_driver = 1; 78 79 /* First pass. If we see an -S or -c, barf. If we see an input file, 80 turn off read_stdin. If we see a second input file, it is actually 81 the output file. If we see a third input file, barf. */ 82 for (i = 1; i < argc; i++) 83 { 84 switch (decoded_options[i].opt_index) 85 { 86 case OPT_E: 87 need_E = 0; 88 break; 89 90 case OPT_S: 91 case OPT_c: 92 fatal_error ("%qs is not a valid option to the preprocessor", 93 decoded_options[i].orig_option_with_args_text); 94 return; 95 96 case OPT_x: 97 need_fixups = 0; 98 break; 99 100 case OPT_SPECIAL_input_file: 101 { 102 const char *file = decoded_options[i].arg; 103 104 if (strcmp (file, "-") == 0) 105 read_stdin = 0; 106 else 107 { 108 seen_input++; 109 if (seen_input == 3) 110 { 111 fatal_error ("too many input files"); 112 return; 113 } 114 else if (seen_input == 2) 115 { 116 o_here = i; 117 } 118 else 119 { 120 read_stdin = 0; 121 if (need_fixups) 122 { 123 int l = strlen (file); 124 int known = 0; 125 const char *const *suff; 126 127 for (suff = known_suffixes; *suff; suff++) 128 if (!strcmp (*suff, &file[l - strlen(*suff)])) 129 { 130 known = 1; 131 break; 132 } 133 134 if (! known) 135 { 136 /* .s files are a special case; we have to 137 treat them like .S files so 138 -D__ASSEMBLER__ will be in effect. */ 139 if (!strcmp (".s", &file[l - 2])) 140 lang_S_here = i; 141 else 142 lang_c_here = i; 143 } 144 } 145 } 146 } 147 } 148 break; 149 } 150 } 151 152 /* If we don't need to edit the command line, we can bail early. */ 153 154 new_argc = argc + need_E + read_stdin + !!lang_c_here + !!lang_S_here; 155 156 if (new_argc == argc && !o_here) 157 return; 158 159 new_decoded_options = XNEWVEC (struct cl_decoded_option, new_argc); 160 161 new_decoded_options[0] = decoded_options[0]; 162 j = 1; 163 164 if (need_E) 165 generate_option (OPT_E, NULL, 1, CL_DRIVER, &new_decoded_options[j++]); 166 167 for (i = 1; i < argc; i++, j++) 168 { 169 if (i == lang_c_here) 170 generate_option (OPT_x, "c", 1, CL_DRIVER, &new_decoded_options[j++]); 171 else if (i == lang_S_here) 172 generate_option (OPT_x, "assembler-with-cpp", 1, CL_DRIVER, 173 &new_decoded_options[j++]); 174 else if (i == o_here) 175 { 176 generate_option (OPT_o, decoded_options[i].arg, 1, CL_DRIVER, 177 &new_decoded_options[j]); 178 continue; 179 } 180 181 new_decoded_options[j] = decoded_options[i]; 182 } 183 184 if (read_stdin) 185 generate_option_input_file ("-", &new_decoded_options[j++]); 186 187 *in_decoded_options_count = new_argc; 188 *in_decoded_options = new_decoded_options; 189 } 190 191 /* Called before linking. Returns 0 on success and -1 on failure. */ 192 int lang_specific_pre_link (void) 193 { 194 return 0; /* Not used for cpp. */ 195 } 196 197 /* Number of extra output files that lang_specific_pre_link may generate. */ 198 int lang_specific_extra_outfiles = 0; /* Not used for cpp. */ 199