1 /* Specific flags and argument handling of the C preprocessor.
2 Copyright (C) 1999 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 2, 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 COPYING. If not, write to the Free
18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
19 02111-1307, USA. */
20
21 #include "config.h"
22 #include "system.h"
23 #include "coretypes.h"
24 #include "tm.h"
25 #include "gcc.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 #ifndef SWITCH_TAKES_ARG
35 #define SWITCH_TAKES_ARG(CHAR) DEFAULT_SWITCH_TAKES_ARG(CHAR)
36 #endif
37
38 #ifndef WORD_SWITCH_TAKES_ARG
39 #define WORD_SWITCH_TAKES_ARG(STR) DEFAULT_WORD_SWITCH_TAKES_ARG (STR)
40 #endif
41
42 /* Suffixes for known sorts of input files. Note that we do not list
43 files which are normally considered to have been preprocessed already,
44 since the user's expectation is that `cpp' always preprocesses. */
45 static const char *const known_suffixes[] =
46 {
47 ".c", ".C", ".S", ".m",
48 ".cc", ".cxx", ".cpp", ".cp", ".c++",
49 NULL
50 };
51
52 /* Filter argc and argv before processing by the gcc driver proper. */
53 void
lang_specific_driver(int * in_argc,const char * const ** in_argv,int * in_added_libraries ATTRIBUTE_UNUSED)54 lang_specific_driver (int *in_argc, const char *const **in_argv,
55 int *in_added_libraries ATTRIBUTE_UNUSED)
56 {
57 int argc = *in_argc;
58 const char *const *argv = *in_argv;
59
60 /* Do we need to read stdin? */
61 int read_stdin = 1;
62
63 /* Do we need to insert -E? */
64 int need_E = 1;
65
66 /* Have we seen an input file? */
67 int seen_input = 0;
68
69 /* Positions to insert -xc, -xassembler-with-cpp, and -o, if necessary.
70 0 means unnecessary. */
71 int lang_c_here = 0;
72 int lang_S_here = 0;
73 int o_here = 0;
74
75 /* Do we need to fix up an input file with an unrecognized suffix? */
76 int need_fixups = 1;
77
78 int i, j, quote = 0;
79 const char **new_argv;
80 int new_argc;
81 extern int is_cpp_driver;
82
83 is_cpp_driver = 1;
84
85 /* First pass. If we see an -S or -c, barf. If we see an input file,
86 turn off read_stdin. If we see a second input file, it is actually
87 the output file. If we see a third input file, barf. */
88 for (i = 1; i < argc; i++)
89 {
90 if (quote == 1)
91 {
92 quote = 0;
93 continue;
94 }
95
96 if (argv[i][0] == '-')
97 {
98 if (argv[i][1] == '\0')
99 read_stdin = 0;
100 else if (argv[i][2] == '\0')
101 {
102 if (argv[i][1] == 'E')
103 need_E = 0;
104 else if (argv[i][1] == 'S' || argv[i][1] == 'c')
105 {
106 fatal ("\"%s\" is not a valid option to the preprocessor",
107 argv[i]);
108 return;
109 }
110 else if (argv[i][1] == 'x')
111 {
112 need_fixups = 0;
113 quote = 1;
114 }
115 else if (SWITCH_TAKES_ARG (argv[i][1]))
116 quote = 1;
117 }
118 else if (argv[i][1] == 'x')
119 need_fixups = 0;
120 else if (WORD_SWITCH_TAKES_ARG (&argv[i][1]))
121 quote = 1;
122 }
123 else /* not an option */
124 {
125 seen_input++;
126 if (seen_input == 3)
127 {
128 fatal ("too many input files");
129 return;
130 }
131 else if (seen_input == 2)
132 {
133 o_here = i;
134 }
135 else
136 {
137 read_stdin = 0;
138 if (need_fixups)
139 {
140 int l = strlen (argv[i]);
141 int known = 0;
142 const char *const *suff;
143
144 for (suff = known_suffixes; *suff; suff++)
145 if (!strcmp (*suff, &argv[i][l - strlen(*suff)]))
146 {
147 known = 1;
148 break;
149 }
150
151 if (! known)
152 {
153 /* .s files are a special case; we have to treat
154 them like .S files so -D__ASSEMBLER__ will be
155 in effect. */
156 if (!strcmp (".s", &argv[i][l - 2]))
157 lang_S_here = i;
158 else
159 lang_c_here = i;
160 }
161 }
162 }
163 }
164 }
165
166 /* If we don't need to edit the command line, we can bail early. */
167
168 new_argc = argc + need_E + read_stdin
169 + !!o_here + !!lang_c_here + !!lang_S_here;
170
171 if (new_argc == argc)
172 return;
173
174 /* One more slot for a terminating null. */
175 new_argv = xmalloc ((new_argc + 1) * sizeof(char *));
176
177 new_argv[0] = argv[0];
178 j = 1;
179
180 if (need_E)
181 new_argv[j++] = "-E";
182
183 for (i = 1; i < argc; i++, j++)
184 {
185 if (i == lang_c_here)
186 new_argv[j++] = "-xc";
187 else if (i == lang_S_here)
188 new_argv[j++] = "-xassembler-with-cpp";
189 else if (i == o_here)
190 new_argv[j++] = "-o";
191
192 new_argv[j] = argv[i];
193 }
194
195 if (read_stdin)
196 new_argv[j++] = "-";
197
198 new_argv[j] = NULL;
199 *in_argc = new_argc;
200 *in_argv = new_argv;
201 }
202
203 /* Called before linking. Returns 0 on success and -1 on failure. */
lang_specific_pre_link(void)204 int lang_specific_pre_link (void)
205 {
206 return 0; /* Not used for cpp. */
207 }
208
209 /* Number of extra output files that lang_specific_pre_link may generate. */
210 int lang_specific_extra_outfiles = 0; /* Not used for cpp. */
211
212 /* Table of language-specific spec functions. */
213 const struct spec_function lang_specific_spec_functions[] =
214 {
215 { 0, 0 }
216 };
217