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
lang_specific_driver(struct cl_decoded_option ** in_decoded_options,unsigned int * in_decoded_options_count,int * in_added_libraries ATTRIBUTE_UNUSED)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. */
lang_specific_pre_link(void)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