1 | /* Specific flags and argument handling of the C preprocessor. |
2 | Copyright (C) 1999-2017 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 (input_location, |
93 | "%qs is not a valid option to the preprocessor" , |
94 | decoded_options[i].orig_option_with_args_text); |
95 | return; |
96 | |
97 | case OPT_x: |
98 | need_fixups = 0; |
99 | break; |
100 | |
101 | case OPT_SPECIAL_input_file: |
102 | { |
103 | const char *file = decoded_options[i].arg; |
104 | |
105 | if (strcmp (file, "-" ) == 0) |
106 | read_stdin = 0; |
107 | else |
108 | { |
109 | seen_input++; |
110 | if (seen_input == 3) |
111 | { |
112 | fatal_error (input_location, "too many input files" ); |
113 | return; |
114 | } |
115 | else if (seen_input == 2) |
116 | { |
117 | o_here = i; |
118 | } |
119 | else |
120 | { |
121 | read_stdin = 0; |
122 | if (need_fixups) |
123 | { |
124 | int l = strlen (file); |
125 | int known = 0; |
126 | const char *const *suff; |
127 | |
128 | for (suff = known_suffixes; *suff; suff++) |
129 | if (!strcmp (*suff, &file[l - strlen(*suff)])) |
130 | { |
131 | known = 1; |
132 | break; |
133 | } |
134 | |
135 | if (! known) |
136 | { |
137 | /* .s files are a special case; we have to |
138 | treat them like .S files so |
139 | -D__ASSEMBLER__ will be in effect. */ |
140 | if (!strcmp (".s" , &file[l - 2])) |
141 | lang_S_here = i; |
142 | else |
143 | lang_c_here = i; |
144 | } |
145 | } |
146 | } |
147 | } |
148 | } |
149 | break; |
150 | } |
151 | } |
152 | |
153 | /* If we don't need to edit the command line, we can bail early. */ |
154 | |
155 | new_argc = argc + need_E + read_stdin + !!lang_c_here + !!lang_S_here; |
156 | |
157 | if (new_argc == argc && !o_here) |
158 | return; |
159 | |
160 | new_decoded_options = XNEWVEC (struct cl_decoded_option, new_argc); |
161 | |
162 | new_decoded_options[0] = decoded_options[0]; |
163 | j = 1; |
164 | |
165 | if (need_E) |
166 | generate_option (OPT_E, NULL, 1, CL_DRIVER, &new_decoded_options[j++]); |
167 | |
168 | for (i = 1; i < argc; i++, j++) |
169 | { |
170 | if (i == lang_c_here) |
171 | generate_option (OPT_x, "c" , 1, CL_DRIVER, &new_decoded_options[j++]); |
172 | else if (i == lang_S_here) |
173 | generate_option (OPT_x, "assembler-with-cpp" , 1, CL_DRIVER, |
174 | &new_decoded_options[j++]); |
175 | else if (i == o_here) |
176 | { |
177 | generate_option (OPT_o, decoded_options[i].arg, 1, CL_DRIVER, |
178 | &new_decoded_options[j]); |
179 | continue; |
180 | } |
181 | |
182 | new_decoded_options[j] = decoded_options[i]; |
183 | } |
184 | |
185 | if (read_stdin) |
186 | generate_option_input_file ("-" , &new_decoded_options[j++]); |
187 | |
188 | *in_decoded_options_count = new_argc; |
189 | *in_decoded_options = new_decoded_options; |
190 | } |
191 | |
192 | /* Called before linking. Returns 0 on success and -1 on failure. */ |
193 | int lang_specific_pre_link (void) |
194 | { |
195 | return 0; /* Not used for cpp. */ |
196 | } |
197 | |
198 | /* Number of extra output files that lang_specific_pre_link may generate. */ |
199 | int = 0; /* Not used for cpp. */ |
200 | |