Add Kconfig preprocessor

Implement the Kconfig preprocessor described in
https://github.com/torvalds/linux/blob/master/Documentation/kbuild/kconfig-macro-language.txt
(which is now in linux-next and will appear in Linux 4.18).

A new Kconfig.variables property holds all the preprocessor variables so
that they can be inspected programmatically. Preprocessor variables are
represented by a new Variable class.

With the preprocessor, environment variables are referenced with $(FOO)
instead of $FOO. For backwards compatibility, $FOO is accepted as well
for now (and leaves "$FOO" as-is if FOO doesn't exist). The $FOO syntax
might be dropped at some point in the future (together with a major
version increase). It should be supported for a few months at least.

Some internals were cleaned up too, mostly related to parsing. Some
outdated documentation was fixed as well.

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/reltest b/tests/reltest
index cd31711..0916c7a 100755
--- a/tests/reltest
+++ b/tests/reltest
@@ -23,7 +23,7 @@ test_script() {
 for py in python2 python3; do
     echo -e "\n================= Test suite with $py =================\n"
 
-    if ! $py Kconfiglib/testsuite.py speedy; then
+    if ! $py Kconfiglib/testsuite.py; then
         echo "test suite failed for $py"
         exit 1
     fi