![Jiri Olsa](/assets/img/avatar_default.png)
The fixdep tool, among other things, replaces the target of the object in the gcc generated dependency output file. The parsing code assumes there's only single target in the rule but this is not always the case as described in here: https://gcc.gnu.org/ml/gcc-help/2016-11/msg00099.html Make the fixdep code smart enough to skip all the possible targets. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Peter Foley <pefoley2@pefoley.com> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/20161201130025.GA16430@krava Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
170 lines
3.7 KiB
C
170 lines
3.7 KiB
C
/*
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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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