kbuild: prevent modpost from looking for a .cmd file for a static library linked...

This fixes a compile time warning which occurs whenever a static library
is linked into a kernel module.  MODPOST tries to look for a
".<modulename>.cmd" file to look for its dependencies, but that file
doesn't exist or get generated for static libraries.

This patch prevents modpost from looking for a .cmd file when a module is
linked with a static library

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Ashutosh Naik <ashutosh.naik@gmail.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

diff --git a/scripts/mod/sumversion.c b/scripts/mod/sumversion.c
index d9cc690..aadc522 100644 (file)
--- a/scripts/mod/sumversion.c
+++ b/scripts/mod/sumversion.c
@@ -290,6 +290,15 @@ static int parse_file(const char *fname, struct md4_ctx *md)
        release_file(file, len);
        return 1;
 }
+/* Check whether the file is a static library or not */
+static int is_static_library(const char *objfile)
+{
+       int len = strlen(objfile);
+       if (objfile[len - 2] == '.' && objfile[len - 1] == 'a')
+               return 1;
+       else
+               return 0;
+}
 
 /* We have dir/file.o.  Open dir/.file.o.cmd, look for deps_ line to
  * figure out source file. */
@@ -420,7 +429,8 @@ void get_src_version(const char *modname, char sum[], unsigned sumlen)
        while ((fname = strsep(&sources, " ")) != NULL) {
                if (!*fname)
                        continue;
-               if (!parse_source_files(fname, &md))
+               if (!(is_static_library(fname)) &&
+                               !parse_source_files(fname, &md))
                        goto release;
        }