1 /* Specific flags and argument handling of the C preprocessor.
2 Copyright (C) 1999 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
24 /* The `cpp' executable installed in $(bindir) and $(cpp_install_dir)
25 is a customized version of the gcc driver. It forces -E; -S and -c
26 are errors. It defaults to -x c for files with unrecognized
27 extensions, unless -x options appear in argv, in which case we
28 assume the user knows what they're doing. If no explicit input is
29 mentioned, it will read stdin. */
31 /* Snarfed from gcc.c: */
33 /* This defines which switch letters take arguments. */
35 #define DEFAULT_SWITCH_TAKES_ARG(CHAR) \
36 ((CHAR) == 'D' || (CHAR) == 'U' || (CHAR) == 'o' \
37 || (CHAR) == 'e' || (CHAR) == 'T' || (CHAR) == 'u' \
38 || (CHAR) == 'I' || (CHAR) == 'm' || (CHAR) == 'x' \
39 || (CHAR) == 'L' || (CHAR) == 'A' || (CHAR) == 'V' \
40 || (CHAR) == 'B' || (CHAR) == 'b')
42 #ifndef SWITCH_TAKES_ARG
43 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
46 /* This defines which multi-letter switches take arguments. */
48 #define DEFAULT_WORD_SWITCH_TAKES_ARG(STR) \
49 (!strcmp (STR, "Tdata") || !strcmp (STR, "Ttext") \
50 || !strcmp (STR, "Tbss") || !strcmp (STR, "include") \
51 || !strcmp (STR, "imacros") || !strcmp (STR, "aux-info") \
52 || !strcmp (STR, "idirafter") || !strcmp (STR, "iprefix") \
53 || !strcmp (STR, "iwithprefix") || !strcmp (STR, "iwithprefixbefore") \
54 || !strcmp (STR, "isystem") || !strcmp (STR, "specs"))
56 #ifndef WORD_SWITCH_TAKES_ARG
57 #define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
60 /* Suffixes for known sorts of input files. Note that we do not list
61 files which are normally considered to have been preprocessed already,
62 since the user's expectation is that `cpp' always preprocesses. */
63 static const char *const known_suffixes[] =
65 ".c", ".C", ".S", ".m",
66 ".cc", ".cxx", ".cpp", ".cp", ".c++",
70 /* Filter argc and argv before processing by the gcc driver proper. */
72 lang_specific_driver (errfn, in_argc, in_argv, in_added_libraries)
73 void (*errfn) PVPROTO((const char *, ...));
76 int *in_added_libraries ATTRIBUTE_UNUSED;
79 char **argv = *in_argv;
81 /* Do we need to read stdin? */
84 /* Do we need to insert -E? */
87 /* Have we seen an input file? */
90 /* Positions to insert -xc, -xassembler-with-cpp, and -o, if necessary.
91 0 means unnecessary. */
96 /* Do we need to fix up an input file with an unrecognized suffix? */
103 /* First pass. If we see an -S or -c, barf. If we see an input file,
104 turn off read_stdin. If we see a second input file, it is actually
105 the output file. If we see a third input file, barf. */
106 for (i = 1; i < argc; i++)
114 if (argv[i][0] == '-')
116 if (argv[i][1] == '\0')
118 else if (argv[i][2] == '\0')
120 if (argv[i][1] == 'E')
122 else if (argv[i][1] == 'S' || argv[i][1] == 'c')
124 (*errfn) ("`%s' is not a legal option to the preprocessor",
128 else if (argv[i][1] == 'x')
133 else if (SWITCH_TAKES_ARG (argv[i][1]))
136 else if (argv[i][1] == 'x')
138 else if (WORD_SWITCH_TAKES_ARG (&argv[i][1]))
141 else /* not an option */
146 (*errfn) ("too many input files");
149 else if (seen_input == 2)
158 int l = strlen (argv[i]);
160 const char *const *suff;
162 for (suff = known_suffixes; *suff; suff++)
163 if (!strcmp (*suff, &argv[i][l - strlen(*suff)]))
171 /* .s files are a special case; we have to treat
172 them like .S files so -D__ASSEMBLER__ will be
174 if (!strcmp (".s", &argv[i][l - 2]))
184 /* If we don't need to edit the command line, we can bail early. */
186 new_argc = argc + need_E + read_stdin
187 + !!o_here + !!lang_c_here + !!lang_S_here;
189 if (new_argc == argc)
192 new_argv = xmalloc (new_argc * sizeof(char *));
194 new_argv[0] = argv[0];
198 new_argv[j++] = "-E";
200 for (i = 1; i < argc; i++, j++)
202 if (i == lang_c_here)
203 new_argv[j++] = "-xc";
204 else if (i == lang_S_here)
205 new_argv[j++] = "-xassembler-with-cpp";
206 else if (i == o_here)
207 new_argv[j++] = "-o";
209 new_argv[j] = argv[i];
219 /* Called before linking. Returns 0 on success and -1 on failure. */
220 int lang_specific_pre_link ()
222 return 0; /* Not used for cpp. */
225 /* Number of extra output files that lang_specific_pre_link may generate. */
226 int lang_specific_extra_outfiles = 0; /* Not used for cpp. */