Add 'imply' support

This is like a 'select' that only changes the default value of a symbol,
not limiting what values the user can set it to (with one exception: A
symbol implied to 'y' can't be set to 'm').

Symbol.get_implied_symbols() was added, corresponding to
Symbol.get_selected_symbols(), and Symbol.__str__() was extended to
print implied symbols and weak reverse dependencies. Weak reverse
dependencies are the 'imply' version of 'select's reverse dependencies.

1 files changed, 18 insertions, 0 deletions

diff --git a/tests/Kdep b/tests/Kdep
index 9f23f94..87defaa 100644
--- a/tests/Kdep
+++ b/tests/Kdep
@@ -1,5 +1,11 @@
 config D
    bool "D"
+   select D29
+   imply D30
+
+config DUMMY
+   select D31 if D
+   imply D32 if D
 
 # The symbols below depend on D in different ways
 
@@ -122,6 +128,18 @@ config D27
 config D28
     bool "D28" if n || ((n != D) || n)
 
+config D29
+    tristate "D29"
+
+config D30
+    tristate "D30"
+
+config D31
+    tristate "D31"
+
+config D32
+    tristate "D32"
+
 #
 # Choices
 #