kconfig: support user-defined function and recursively expanded variable

[carl9170fw.git] / config / zconf.y

diff --git a/config/zconf.y b/config/zconf.y
index e31e3d38740c4e8ba0d402b6e3b3344dfa497b6b..addd4a68b549c5557a5ba41781e1a31d96ed7729 100644 (file)
--- a/config/zconf.y
+++ b/config/zconf.y
@@ -77,6 +77,9 @@ static struct menu *current_menu, *current_entry;
 %token T_CLOSE_PAREN
 %token T_OPEN_PAREN
 %token T_EOL
+%token <string> T_VARIABLE
+%token T_ASSIGN
+%token <string> T_ASSIGN_VAL
 
 %left T_OR
 %left T_AND
@@ -92,7 +95,7 @@ static struct menu *current_menu, *current_entry;
 %type <id> end
 %type <id> option_name
 %type <menu> if_entry menu_entry choice_entry
-%type <string> symbol_option_arg word_opt
+%type <string> symbol_option_arg word_opt assign_val
 
 %destructor {
        fprintf(stderr, "%s:%d: missing end statement for this entry\n",
@@ -143,6 +146,7 @@ common_stmt:
        | config_stmt
        | menuconfig_stmt
        | source_stmt
+       | assignment_stmt
 ;
 
 option_error:
@@ -511,6 +515,15 @@ symbol:      nonconst_symbol
 word_opt: /* empty */                  { $$ = NULL; }
        | T_WORD
 
+/* assignment statement */
+
+assignment_stmt:  T_VARIABLE T_ASSIGN assign_val T_EOL { variable_add($1, $3); free($1); free($3); }
+
+assign_val:
+       /* empty */             { $$ = xstrdup(""); };
+       | T_ASSIGN_VAL
+;
+
 %%
 
 void conf_parse(const char *name)
@@ -526,6 +539,10 @@ void conf_parse(const char *name)
        if (getenv("ZCONF_DEBUG"))
                yydebug = 1;
        yyparse();
+
+       /* Variables are expanded in the parse phase. We can free them here. */
+       variable_all_del();
+
        if (yynerrs)
                exit(1);
        if (!modules_sym)