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9ced3bddec
Now, we got a basic ability to test compiler capability in Kconfig.
config CC_HAS_STACKPROTECTOR
def_bool $(shell,($(CC) -Werror -fstack-protector -E -x c /dev/null -o /dev/null 2>/dev/null) && echo y || echo n)
This works, but it is ugly to repeat this long boilerplate.
We want to describe like this:
config CC_HAS_STACKPROTECTOR
bool
default $(cc-option,-fstack-protector)
It is straight-forward to add a new function, but I do not like to
hard-code specialized functions like that. Hence, here is another
feature, user-defined function. This works as a textual shorthand
with parameterization.
A user-defined function is defined by using the = operator, and can
be referenced in the same way as built-in functions. A user-defined
function in Make is referenced like $(call my-func,arg1,arg2), but I
omitted the 'call' to make the syntax shorter.
The definition of a user-defined function contains $(1), $(2), etc.
in its body to reference the parameters. It is grammatically valid
to pass more or fewer arguments when calling it. We already exploit
this feature in our makefiles; scripts/Kbuild.include defines cc-option
which takes two arguments at most, but most of the callers pass only
one argument.
By the way, a variable is supported as a subset of this feature since
a variable is "a user-defined function with zero argument". In this
context, I mean "variable" as recursively expanded variable. I will
add a different flavored variable in the next commit.
The code above can be written as follows:
[Example Code]
success = $(shell,($(1)) >/dev/null 2>&1 && echo y || echo n)
cc-option = $(success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null)
config CC_HAS_STACKPROTECTOR
def_bool $(cc-option,-fstack-protector)
[Result]
$ make -s alldefconfig && tail -n 1 .config
CONFIG_CC_HAS_STACKPROTECTOR=y
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
60 lines
2.4 KiB
C
60 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <stdarg.h>
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/* confdata.c */
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void conf_parse(const char *name);
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int conf_read(const char *name);
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int conf_read_simple(const char *name, int);
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int conf_write_defconfig(const char *name);
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int conf_write(const char *name);
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int conf_write_autoconf(void);
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bool conf_get_changed(void);
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void conf_set_changed_callback(void (*fn)(void));
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void conf_set_message_callback(void (*fn)(const char *fmt, va_list ap));
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/* menu.c */
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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_root_menu(struct menu *menu);
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struct menu * menu_get_parent_menu(struct menu *menu);
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bool menu_has_help(struct menu *menu);
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const char * menu_get_help(struct menu *menu);
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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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extern struct symbol * symbol_hash[SYMBOL_HASHSIZE];
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struct symbol * sym_lookup(const char *name, int flags);
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struct symbol * sym_find(const char *name);
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const char * sym_escape_string_value(const char *in);
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struct symbol ** sym_re_search(const char *pattern);
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const char * sym_type_name(enum symbol_type type);
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void sym_calc_value(struct symbol *sym);
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enum symbol_type sym_get_type(struct symbol *sym);
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bool sym_tristate_within_range(struct symbol *sym,tristate tri);
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bool sym_set_tristate_value(struct symbol *sym,tristate tri);
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tristate sym_toggle_tristate_value(struct symbol *sym);
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bool sym_string_valid(struct symbol *sym, const char *newval);
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bool sym_string_within_range(struct symbol *sym, const char *str);
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bool sym_set_string_value(struct symbol *sym, const char *newval);
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bool sym_is_changable(struct symbol *sym);
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struct property * sym_get_choice_prop(struct symbol *sym);
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const char * sym_get_string_value(struct symbol *sym);
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const char * prop_get_type_name(enum prop_type type);
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/* preprocess.c */
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void env_write_dep(FILE *f, const char *auto_conf_name);
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void variable_add(const char *name, const char *value);
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void variable_all_del(void);
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char *expand_string(const char *in);
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char *expand_dollar(const char **str);
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char *expand_one_token(const char **str);
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/* expr.c */
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void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *), void *data, int prevtoken);
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