171 lines
3.7 KiB
C
Executable file
171 lines
3.7 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
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/*
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* "Optimize" a list of dependencies as spit out by gcc -MD
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* for the build framework.
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*
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* Original author:
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* Copyright 2002 by Kai Germaschewski <kai.germaschewski@gmx.de>
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*
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* This code has been borrowed from kbuild's fixdep (scripts/basic/fixdep.c),
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* Please check it for detailed explanation. This fixdep borow only the
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* base transformation of dependecies without the CONFIG mangle.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <limits.h>
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char *target;
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char *depfile;
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char *cmdline;
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static void usage(void)
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{
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fprintf(stderr, "Usage: fixdep <depfile> <target> <cmdline>\n");
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exit(1);
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}
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/*
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* Print out the commandline prefixed with cmd_<target filename> :=
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*/
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static void print_cmdline(void)
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{
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printf("cmd_%s := %s\n\n", target, cmdline);
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}
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/*
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* Important: The below generated source_foo.o and deps_foo.o variable
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* assignments are parsed not only by make, but also by the rather simple
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* parser in scripts/mod/sumversion.c.
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*/
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static void parse_dep_file(void *map, size_t len)
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{
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char *m = map;
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char *end = m + len;
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char *p;
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char s[PATH_MAX];
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int is_target, has_target = 0;
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int saw_any_target = 0;
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int is_first_dep = 0;
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while (m < end) {
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/* Skip any "white space" */
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while (m < end && (*m == ' ' || *m == '\\' || *m == '\n'))
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m++;
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/* Find next "white space" */
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p = m;
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while (p < end && *p != ' ' && *p != '\\' && *p != '\n')
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p++;
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/* Is the token we found a target name? */
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is_target = (*(p-1) == ':');
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/* Don't write any target names into the dependency file */
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if (is_target) {
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/* The /next/ file is the first dependency */
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is_first_dep = 1;
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has_target = 1;
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} else if (has_target) {
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/* Save this token/filename */
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memcpy(s, m, p-m);
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s[p - m] = 0;
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/*
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* Do not list the source file as dependency,
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* so that kbuild is not confused if a .c file
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* is rewritten into .S or vice versa. Storing
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* it in source_* is needed for modpost to
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* compute srcversions.
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*/
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if (is_first_dep) {
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/*
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* If processing the concatenation of
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* multiple dependency files, only
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* process the first target name, which
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* will be the original source name,
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* and ignore any other target names,
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* which will be intermediate temporary
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* files.
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*/
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if (!saw_any_target) {
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saw_any_target = 1;
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printf("source_%s := %s\n\n",
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target, s);
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printf("deps_%s := \\\n",
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target);
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}
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is_first_dep = 0;
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} else
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printf(" %s \\\n", s);
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}
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/*
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* Start searching for next token immediately after the first
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* "whitespace" character that follows this token.
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*/
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m = p + 1;
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}
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if (!saw_any_target) {
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fprintf(stderr, "fixdep: parse error; no targets found\n");
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exit(1);
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}
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printf("\n%s: $(deps_%s)\n\n", target, target);
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printf("$(deps_%s):\n", target);
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}
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static void print_deps(void)
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{
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struct stat st;
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int fd;
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void *map;
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fd = open(depfile, O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "fixdep: error opening depfile: ");
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perror(depfile);
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exit(2);
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}
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if (fstat(fd, &st) < 0) {
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fprintf(stderr, "fixdep: error fstat'ing depfile: ");
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perror(depfile);
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exit(2);
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}
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if (st.st_size == 0) {
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fprintf(stderr, "fixdep: %s is empty\n", depfile);
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close(fd);
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return;
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}
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map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
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if ((long) map == -1) {
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perror("fixdep: mmap");
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close(fd);
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return;
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}
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parse_dep_file(map, st.st_size);
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munmap(map, st.st_size);
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close(fd);
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}
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int main(int argc, char **argv)
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{
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if (argc != 4)
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usage();
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depfile = argv[1];
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target = argv[2];
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cmdline = argv[3];
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print_cmdline();
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print_deps();
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return 0;
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}
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