[PATCH B] fixdep: fix U-Boot own code to handle only valid symbol characters

[Masahiro Yamada <masahiroy@kernel.org>]

Currently, fixdep skips parsing include/linux/kconfig.h, but if it
parsed it, it would translate the following code in kconfig.h

  config_enabled(CONFIG_VAL(option##_MODULE)

into:

  $(wildcard include/config/option##/module.h)

When Kbuild includes .*.cmd, it would emit the following error:

  *** unterminated call to function 'wildcard': missing ')'.  Stop.

This issue prevents us from importing the upstream Linux commit
638e69cf2230 ("fixdep: do not ignore kconfig.h").

Fix this by handling only alphanumerical characters and underscores.
This makes sense because they match to the valid character sets in
Kconfig symbols.

As a side-note, you can reproduce this issue only on GNU Make <= 4.2.1

For GNU Make <= 4.2.1, the '#' always means the start of a comment.
Hence, GNU Make thinks the closing ')' is missing.

The following commit in GNU Make changed how it handles '#' in
function invocations. So, this does not happen for GNU Make 4.3

| commit c6966b323811c37acedff05b576b907b06aea5f4
| Author: Paul Smith <psmith@gnu.org>
| Date:   Thu Dec 22 18:47:26 2016 -0500
|
|    [SV 20513] Un-escaped # are not comments in function invocations

Fixes: 8be60f06c258 ("linux/kconfig.h: add CPP macros useful for per-image config options")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

This patch is applicable on top of Tom's resync:

 scripts/basic/fixdep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
index 8c21dd08d9f7..0ff564a5cc86 100644
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -255,7 +255,7 @@ static void parse_config_file(const char *p)
 		    (q - p == 9 && !memcmp(p, "IS_MODULE(", 10)) ||
 		    (q - p == 3 && !memcmp(p, "VAL(", 4))) {
 			p = q + 1;
-			while (*q && *q != ')')
+			while (isalnum(*q) || *q == '_')
 				q++;
 			r = q;
 			if (r > p && is_spl_build) {
-- 
2.17.1