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The 'choice' statement is primarily used to exclusively select one
option, but the 'optional' property allows all entries to be disabled.
In the following example, both A and B can be disabled simultaneously:
choice
prompt "choose A, B, or nothing"
optional
config A
bool "A"
config B
bool "B"
endchoice
You can achieve the equivalent outcome by other means.
A common solution is to add another option to guard the choice block.
In the following example, you can set ENABLE_A_B_CHOICE=n to disable
the entire choice block:
choice
prompt "choose A or B"
depends on ENABLE_A_B_CHOICE
config A
bool "A"
config B
bool "B"
endchoice
Another approach is to insert one more entry:
choice
prompt "choose A, B, or disable both"
config A
bool "A"
config B
bool "B"
config DISABLE_A_AND_B
bool "choose this to disable both A and B"
endchoice
Some real examples are DEBUG_INFO_NONE, INITRAMFS_COMPRESSION_NONE,
LTO_NONE, etc.
The 'optional' property is even more unnecessary for a tristate choice.
Without the 'optional' property, you can disable A and B; you can set
'm' in the choice prompt, and disable A and B individually:
choice
prompt "choose one built-in or make them modular"
config A
tristate "A"
config B
tristate "B"
endchoice
In conclusion, the 'optional' property was unneeded.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <n.schier@avm.de>
151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
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*/
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#ifndef LKC_H
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#define LKC_H
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "expr.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "lkc_proto.h"
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#define SRCTREE "srctree"
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#ifndef CONFIG_
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#define CONFIG_ "CONFIG_"
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#endif
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static inline const char *CONFIG_prefix(void)
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{
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return getenv( "CONFIG_" ) ?: CONFIG_;
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}
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#undef CONFIG_
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#define CONFIG_ CONFIG_prefix()
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extern int yylineno;
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void zconfdump(FILE *out);
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void zconf_starthelp(void);
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FILE *zconf_fopen(const char *name);
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void zconf_initscan(const char *name);
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void zconf_nextfile(const char *name);
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/* confdata.c */
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extern struct gstr autoconf_cmd;
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const char *conf_get_configname(void);
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void set_all_choice_values(struct symbol *csym);
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/* confdata.c and expr.c */
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static inline void xfwrite(const void *str, size_t len, size_t count, FILE *out)
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{
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assert(len != 0);
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if (fwrite(str, len, count, out) != count)
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fprintf(stderr, "Error in writing or end of file.\n");
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}
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/* util.c */
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unsigned int strhash(const char *s);
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const char *file_lookup(const char *name);
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void *xmalloc(size_t size);
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void *xcalloc(size_t nmemb, size_t size);
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void *xrealloc(void *p, size_t size);
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char *xstrdup(const char *s);
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char *xstrndup(const char *s, size_t n);
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/* lexer.l */
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int yylex(void);
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struct gstr {
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size_t len;
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char *s;
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/*
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* when max_width is not zero long lines in string s (if any) get
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* wrapped not to exceed the max_width value
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*/
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int max_width;
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};
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struct gstr str_new(void);
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void str_free(struct gstr *gs);
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void str_append(struct gstr *gs, const char *s);
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void str_printf(struct gstr *gs, const char *fmt, ...);
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char *str_get(struct gstr *gs);
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/* menu.c */
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struct menu *menu_next(struct menu *menu, struct menu *root);
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#define menu_for_each_sub_entry(menu, root) \
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for (menu = menu_next(root, root); menu; menu = menu_next(menu, root))
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#define menu_for_each_entry(menu) \
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menu_for_each_sub_entry(menu, &rootmenu)
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void _menu_init(void);
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void menu_warn(struct menu *menu, const char *fmt, ...);
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struct menu *menu_add_menu(void);
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void menu_end_menu(void);
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void menu_add_entry(struct symbol *sym);
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void menu_add_dep(struct expr *dep);
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void menu_add_visibility(struct expr *dep);
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struct property *menu_add_prompt(enum prop_type type, char *prompt, struct expr *dep);
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void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep);
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void menu_add_symbol(enum prop_type type, struct symbol *sym, struct expr *dep);
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void menu_finalize(void);
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void menu_set_type(int type);
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extern struct menu rootmenu;
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bool menu_is_empty(struct menu *menu);
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bool menu_is_visible(struct menu *menu);
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bool menu_has_prompt(struct menu *menu);
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const char *menu_get_prompt(struct menu *menu);
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struct menu *menu_get_parent_menu(struct menu *menu);
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int get_jump_key_char(void);
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struct gstr get_relations_str(struct symbol **sym_arr, struct list_head *head);
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void menu_get_ext_help(struct menu *menu, struct gstr *help);
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/* symbol.c */
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void sym_clear_all_valid(void);
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struct symbol *sym_choice_default(struct symbol *sym);
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struct property *sym_get_range_prop(struct symbol *sym);
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const char *sym_get_string_default(struct symbol *sym);
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struct symbol *sym_check_deps(struct symbol *sym);
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struct symbol *prop_get_symbol(struct property *prop);
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static inline tristate sym_get_tristate_value(struct symbol *sym)
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{
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return sym->curr.tri;
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}
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static inline struct symbol *sym_get_choice_value(struct symbol *sym)
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{
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return (struct symbol *)sym->curr.val;
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}
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static inline bool sym_is_choice(struct symbol *sym)
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{
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/* A choice is a symbol with no name */
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return sym->name == NULL;
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}
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static inline bool sym_is_choice_value(struct symbol *sym)
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{
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return sym->flags & SYMBOL_CHOICEVAL ? true : false;
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}
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static inline bool sym_has_value(struct symbol *sym)
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{
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return sym->flags & SYMBOL_DEF_USER ? true : false;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* LKC_H */
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