kconfig: warn no new line at end of file

It would be nice to warn if a new line is missing at end of file.

We could do this by checkpatch.pl for arbitrary files, but new line
is rather essential as a statement terminator in Kconfig.

The warning message looks like this:

  kernel/Kconfig.preempt:60:warning: no new line at end of file

Currently, kernel/Kconfig.preempt is the only file with no new line
at end of file. Fix it.

I know there are some false negative cases. For example, no warning
is displayed when the last line contains some whitespaces/comments,
but no new line. Yet, this commit works well for most cases.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

diff --git a/config/zconf.l b/config/zconf.l
index 5b0188a7e9a6f57272d5914e750c112335dfccca..a6caf06a6506d21648384e872c7adcd99af28b0c 100644 (file)
--- a/config/zconf.l
+++ b/config/zconf.l
@@ -261,6 +261,10 @@ n  [A-Za-z0-9_-]
 <<EOF>>        {
        BEGIN(INITIAL);
 
+       if (prev_token != T_EOL && prev_token != T_HELPTEXT)
+               fprintf(stderr, "%s:%d:warning: no new line at end of file\n",
+                       current_file->name, yylineno);
+
        if (current_file) {
                zconf_endfile();
                return T_EOL;