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1 /*
2 * "Optimize" a list of dependencies as spit out by gcc -MD
3 * for the build framework.
4 *
5 * Original author:
6 * Copyright 2002 by Kai Germaschewski <kai.germaschewski@gmx.de>
7 *
8 * This code has been borrowed from kbuild's fixdep (scripts/basic/fixdep.c),
9 * Please check it for detailed explanation. This fixdep borow only the
10 * base transformation of dependecies without the CONFIG mangle.
11 */
12
13 #include <sys/types.h>
14 #include <sys/stat.h>
15 #include <sys/mman.h>
16 #include <unistd.h>
17 #include <fcntl.h>
18 #include <string.h>
19 #include <stdlib.h>
20 #include <stdio.h>
21 #include <limits.h>
22
23 char *target;
24 char *depfile;
25 char *cmdline;
26
27 static void usage(void)
28 {
29 fprintf(stderr, "Usage: fixdep <depfile> <target> <cmdline>\n");
30 exit(1);
31 }
32
33 /*
34 * Print out the commandline prefixed with cmd_<target filename> :=
35 */
36 static void print_cmdline(void)
37 {
38 printf("cmd_%s := %s\n\n", target, cmdline);
39 }
40
41 /*
42 * Important: The below generated source_foo.o and deps_foo.o variable
43 * assignments are parsed not only by make, but also by the rather simple
44 * parser in scripts/mod/sumversion.c.
45 */
46 static void parse_dep_file(void *map, size_t len)
47 {
48 char *m = map;
49 char *end = m + len;
50 char *p;
51 char s[PATH_MAX];
52 int is_target, has_target = 0;
53 int saw_any_target = 0;
54 int is_first_dep = 0;
55
56 while (m < end) {
57 /* Skip any "white space" */
58 while (m < end && (*m == ' ' || *m == '\\' || *m == '\n'))
59 m++;
60 /* Find next "white space" */
61 p = m;
62 while (p < end && *p != ' ' && *p != '\\' && *p != '\n')
63 p++;
64 /* Is the token we found a target name? */
65 is_target = (*(p-1) == ':');
66 /* Don't write any target names into the dependency file */
67 if (is_target) {
68 /* The /next/ file is the first dependency */
69 is_first_dep = 1;
70 has_target = 1;
71 } else if (has_target) {
72 /* Save this token/filename */
73 memcpy(s, m, p-m);
74 s[p - m] = 0;
75
76 /*
77 * Do not list the source file as dependency,
78 * so that kbuild is not confused if a .c file
79 * is rewritten into .S or vice versa. Storing
80 * it in source_* is needed for modpost to
81 * compute srcversions.
82 */
83 if (is_first_dep) {
84 /*
85 * If processing the concatenation of
86 * multiple dependency files, only
87 * process the first target name, which
88 * will be the original source name,
89 * and ignore any other target names,
90 * which will be intermediate temporary
91 * files.
92 */
93 if (!saw_any_target) {
94 saw_any_target = 1;
95 printf("source_%s := %s\n\n",
96 target, s);
97 printf("deps_%s := \\\n",
98 target);
99 }
100 is_first_dep = 0;
101 } else
102 printf(" %s \\\n", s);
103 }
104 /*
105 * Start searching for next token immediately after the first
106 * "whitespace" character that follows this token.
107 */
108 m = p + 1;
109 }
110
111 if (!saw_any_target) {
112 fprintf(stderr, "fixdep: parse error; no targets found\n");
113 exit(1);
114 }
115
116 printf("\n%s: $(deps_%s)\n\n", target, target);
117 printf("$(deps_%s):\n", target);
118 }
119
120 static void print_deps(void)
121 {
122 struct stat st;
123 int fd;
124 void *map;
125
126 fd = open(depfile, O_RDONLY);
127 if (fd < 0) {
128 fprintf(stderr, "fixdep: error opening depfile: ");
129 perror(depfile);
130 exit(2);
131 }
132 if (fstat(fd, &st) < 0) {
133 fprintf(stderr, "fixdep: error fstat'ing depfile: ");
134 perror(depfile);
135 exit(2);
136 }
137 if (st.st_size == 0) {
138 fprintf(stderr, "fixdep: %s is empty\n", depfile);
139 close(fd);
140 return;
141 }
142 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
143 if ((long) map == -1) {
144 perror("fixdep: mmap");
145 close(fd);
146 return;
147 }
148
149 parse_dep_file(map, st.st_size);
150
151 munmap(map, st.st_size);
152
153 close(fd);
154 }
155
156 int main(int argc, char **argv)
157 {
158 if (argc != 4)
159 usage();
160
161 depfile = argv[1];
162 target = argv[2];
163 cmdline = argv[3];
164
165 print_cmdline();
166 print_deps();
167
168 return 0;
169 }