kbuild: Fix computing srcversion for modules
Recent change to fixdep:
commit b7bd182176960fdd139486cadb9962b39f8a2b50
Author: Michal Marek <mmarek@suse.cz>
Date: Thu Feb 17 15:13:54 2011 +0100
fixdep: Do not record dependency on the source file itself
changed the format of the *.cmd files without realizing that it is also
used by modpost. Put the path to the source file to the file back, in a
special variable, so that modpost sees all source files when calculating
srcversion for modules.
Reported-and-tested-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Michal Marek <mmarek@suse.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
index 6c94c6c..291228e 100644
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -309,6 +309,11 @@
close(fd);
}
+/*
+ * Important: The below generated source_foo.o and deps_foo.o variable
+ * assignments are parsed not only by make, but also by the rather simple
+ * parser in scripts/mod/sumversion.c.
+ */
static void parse_dep_file(void *map, size_t len)
{
char *m = map;
@@ -323,7 +328,6 @@
exit(1);
}
memcpy(s, m, p-m); s[p-m] = 0;
- printf("deps_%s := \\\n", target);
m = p+1;
clear_config();
@@ -343,12 +347,15 @@
strrcmp(s, "arch/um/include/uml-config.h") &&
strrcmp(s, ".ver")) {
/*
- * Do not output the first dependency (the
- * source file), so that kbuild is not confused
- * if a .c file is rewritten into .S or vice
- * versa.
+ * Do not list the source file as dependency, so that
+ * kbuild is not confused if a .c file is rewritten
+ * into .S or vice versa. Storing it in source_* is
+ * needed for modpost to compute srcversions.
*/
- if (!first)
+ if (first) {
+ printf("source_%s := %s\n\n", target, s);
+ printf("deps_%s := \\\n", target);
+ } else
printf(" %s \\\n", s);
do_config_file(s);
}
diff --git a/scripts/mod/sumversion.c b/scripts/mod/sumversion.c
index ecf9c7d..9dfcd6d 100644
--- a/scripts/mod/sumversion.c
+++ b/scripts/mod/sumversion.c
@@ -300,8 +300,8 @@
return 0;
}
-/* We have dir/file.o. Open dir/.file.o.cmd, look for deps_ line to
- * figure out source file. */
+/* We have dir/file.o. Open dir/.file.o.cmd, look for source_ and deps_ line
+ * to figure out source files. */
static int parse_source_files(const char *objfile, struct md4_ctx *md)
{
char *cmd, *file, *line, *dir;
@@ -340,6 +340,21 @@
*/
while ((line = get_next_line(&pos, file, flen)) != NULL) {
char* p = line;
+
+ if (strncmp(line, "source_", sizeof("source_")-1) == 0) {
+ p = strrchr(line, ' ');
+ if (!p) {
+ warn("malformed line: %s\n", line);
+ goto out_file;
+ }
+ p++;
+ if (!parse_file(p, md)) {
+ warn("could not open %s: %s\n",
+ p, strerror(errno));
+ goto out_file;
+ }
+ continue;
+ }
if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {
check_files = 1;
continue;