kconfig: environment symbol support

Add the possibility to import a value from the environment into kconfig
via the option syntax. Beside flexibility this has the advantage
providing proper dependencies.
Documented the options syntax.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/scripts/kconfig/zconf.gperf b/scripts/kconfig/zconf.gperf
index 93538e567bda..4051639c0900 100644
--- a/scripts/kconfig/zconf.gperf
+++ b/scripts/kconfig/zconf.gperf
@@ -41,4 +41,5 @@ option,		T_OPTION,	TF_COMMAND
 on,             T_ON,           TF_PARAM
 modules,        T_OPT_MODULES,  TF_OPTION
 defconfig_list, T_OPT_DEFCONFIG_LIST,TF_OPTION
+env,            T_OPT_ENV,      TF_OPTION
 %%