kconfig: support append assignment operator
Support += operator. This appends a space and the text on the
righthand side to a variable.
The timing of the evaluation of the righthand side depends on the
flavor of the variable. If the lefthand side was originally defined
as a simple variable, the righthand side is expanded immediately.
Otherwise, the expansion is deferred. Appending something to an
undefined variable results in a recursive variable.
To implement this, we need to remember the flavor of variables.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/scripts/kconfig/lkc_proto.h b/scripts/kconfig/lkc_proto.h
index 6303193..a8b7a33 100644
--- a/scripts/kconfig/lkc_proto.h
+++ b/scripts/kconfig/lkc_proto.h
@@ -52,6 +52,7 @@ const char * prop_get_type_name(enum prop_type type);
enum variable_flavor {
VAR_SIMPLE,
VAR_RECURSIVE,
+ VAR_APPEND,
};
void env_write_dep(FILE *f, const char *auto_conf_name);
void variable_add(const char *name, const char *value,