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>
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Sam Ravnborg

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@@ -106,7 +106,8 @@ struct symbol {
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#define SYMBOL_HASHMASK 0xff
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enum prop_type {
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P_UNKNOWN, P_PROMPT, P_COMMENT, P_MENU, P_DEFAULT, P_CHOICE, P_SELECT, P_RANGE
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P_UNKNOWN, P_PROMPT, P_COMMENT, P_MENU, P_DEFAULT, P_CHOICE,
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P_SELECT, P_RANGE, P_ENV
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};
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struct property {
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