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Subjectkconfig: support option env="" [Was: kconfig: use $K64BIT to set 64BIT with all*config targets]
Hi Roman.

Some time ago you sent the following patch which I have started
to review properly and test.
But it triggers a few questions / comments.

For reference (since it is so long ago I have kept most
of the patch but only a few places are commented.

Please get back to me so we can finsih this patch and have it applied.
I will split the patch in two btw.
One where option env= is introduced
and a second patch that kill the three hardcoded variables
in symbol.c (ARCH, KERNELVERSION and UNAME_RELEASE).

Sam

> The patch below adds some features to it:
> - it allows to import any environment variable by specifying "option env=..."
> - it generates a dependency on it, so the kernel config is updated if it
> changes.
>
>
> Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
>
> ---
> init/Kconfig | 4 ++
> scripts/kconfig/expr.c | 16 +++++-----
> scripts/kconfig/expr.h | 5 +--
> scripts/kconfig/lkc.h | 5 +++
> scripts/kconfig/menu.c | 7 +++-
> scripts/kconfig/qconf.cc | 15 ++-------
> scripts/kconfig/symbol.c | 53 +++++++++++++++++++++++++++++------
> scripts/kconfig/util.c | 25 +++++++++++++++-
> scripts/kconfig/zconf.gperf | 1
> scripts/kconfig/zconf.hash.c_shipped | 45 ++++++++++++++++-------------
> 10 files changed, 123 insertions(+), 53 deletions(-)
>
> Index: linux-2.6/init/Kconfig
> ===================================================================
> --- linux-2.6.orig/init/Kconfig
> +++ linux-2.6/init/Kconfig
> @@ -7,6 +7,10 @@ config DEFCONFIG_LIST
> default "/boot/config-$UNAME_RELEASE"
> default "arch/$ARCH/defconfig"
>
> +config ARCH
> + string
> + option env="ARCH"
> +
> menu "General setup"
>
> config EXPERIMENTAL
> Index: linux-2.6/scripts/kconfig/expr.c
> ===================================================================
> --- linux-2.6.orig/scripts/kconfig/expr.c
> +++ linux-2.6/scripts/kconfig/expr.c
> @@ -87,7 +87,7 @@ struct expr *expr_copy(struct expr *org)
> break;
> case E_AND:
> case E_OR:
> - case E_CHOICE:
> + case E_LIST:
> e->left.expr = expr_copy(org->left.expr);
> e->right.expr = expr_copy(org->right.expr);
> break;
> @@ -217,7 +217,7 @@ int expr_eq(struct expr *e1, struct expr
> expr_free(e2);
> trans_count = old_count;
> return res;
> - case E_CHOICE:
> + case E_LIST:
> case E_RANGE:
> case E_NONE:
> /* panic */;
> @@ -648,7 +648,7 @@ struct expr *expr_transform(struct expr
> case E_EQUAL:
> case E_UNEQUAL:
> case E_SYMBOL:
> - case E_CHOICE:
> + case E_LIST:
> break;
> default:
> e->left.expr = expr_transform(e->left.expr);
> @@ -932,7 +932,7 @@ struct expr *expr_trans_compare(struct e
> break;
> case E_SYMBOL:
> return expr_alloc_comp(type, e->left.sym, sym);
> - case E_CHOICE:
> + case E_LIST:
> case E_RANGE:
> case E_NONE:
> /* panic */;
> @@ -1000,9 +1000,9 @@ int expr_compare_type(enum expr_type t1,
> if (t2 == E_OR)
> return 1;
> case E_OR:
> - if (t2 == E_CHOICE)
> + if (t2 == E_LIST)
> return 1;
> - case E_CHOICE:
> + case E_LIST:
> if (t2 == 0)
> return 1;
> default:
> @@ -1053,11 +1053,11 @@ void expr_print(struct expr *e, void (*f
> fn(data, NULL, " && ");
> expr_print(e->right.expr, fn, data, E_AND);
> break;
> - case E_CHOICE:
> + case E_LIST:
> fn(data, e->right.sym, e->right.sym->name);
> if (e->left.expr) {
> fn(data, NULL, " ^ ");
> - expr_print(e->left.expr, fn, data, E_CHOICE);
> + expr_print(e->left.expr, fn, data, E_LIST);
> }
> break;
> case E_RANGE:
> Index: linux-2.6/scripts/kconfig/expr.h
> ===================================================================
> --- linux-2.6.orig/scripts/kconfig/expr.h
> +++ linux-2.6/scripts/kconfig/expr.h
> @@ -32,7 +32,7 @@ typedef enum tristate {
> } tristate;
>
> enum expr_type {
> - E_NONE, E_OR, E_AND, E_NOT, E_EQUAL, E_UNEQUAL, E_CHOICE, E_SYMBOL, E_RANGE
> + E_NONE, E_OR, E_AND, E_NOT, E_EQUAL, E_UNEQUAL, E_LIST, E_SYMBOL, E_RANGE
> };
>
> union expr_data {
> @@ -105,7 +105,8 @@ struct symbol {
> #define SYMBOL_HASHMASK 0xff
>
> enum prop_type {
> - P_UNKNOWN, P_PROMPT, P_COMMENT, P_MENU, P_DEFAULT, P_CHOICE, P_SELECT, P_RANGE
> + P_UNKNOWN, P_PROMPT, P_COMMENT, P_MENU, P_DEFAULT, P_CHOICE,
> + P_SELECT, P_RANGE, P_ENV
> };
>
> struct property {
> Index: linux-2.6/scripts/kconfig/lkc.h
> ===================================================================
> --- linux-2.6.orig/scripts/kconfig/lkc.h
> +++ linux-2.6/scripts/kconfig/lkc.h
> @@ -44,6 +44,7 @@ extern "C" {
>
> #define T_OPT_MODULES 1
> #define T_OPT_DEFCONFIG_LIST 2
> +#define T_OPT_ENV 3
>
> struct kconf_id {
> int name;
> @@ -74,6 +75,7 @@ void kconfig_load(void);
>
> /* menu.c */
> void menu_init(void);
> +void menu_warn(struct menu *menu, const char *fmt, ...);
> struct menu *menu_add_menu(void);
> void menu_end_menu(void);
> void menu_add_entry(struct symbol *sym);
> @@ -103,6 +105,8 @@ void str_printf(struct gstr *gs, const c
> const char *str_get(struct gstr *gs);
>
> /* symbol.c */
> +struct expr *sym_env_list;

As this is in a .h file I assume it should be extern.
So I did:
> +extern struct expr *sym_env_list;
> +
> void sym_init(void);
> void sym_clear_all_valid(void);
> void sym_set_all_changed(void);
> @@ -110,6 +114,7 @@ void sym_set_changed(struct symbol *sym)
> struct symbol *sym_check_deps(struct symbol *sym);
> struct property *prop_alloc(enum prop_type type, struct symbol *sym);
> struct symbol *prop_get_symbol(struct property *prop);
> +struct property *sym_get_env_prop(struct symbol *sym);
>
> static inline tristate sym_get_tristate_value(struct symbol *sym)
> {
> Index: linux-2.6/scripts/kconfig/menu.c
> ===================================================================
> --- linux-2.6.orig/scripts/kconfig/menu.c
> +++ linux-2.6/scripts/kconfig/menu.c
> @@ -15,7 +15,7 @@ static struct menu **last_entry_ptr;
> struct file *file_list;
> struct file *current_file;
>
> -static void menu_warn(struct menu *menu, const char *fmt, ...)
> +void menu_warn(struct menu *menu, const char *fmt, ...)
> {
> va_list ap;
> va_start(ap, fmt);
> @@ -172,6 +172,9 @@ void menu_add_option(int token, char *ar
> else if (sym_defconfig_list != current_entry->sym)
> zconf_error("trying to redefine defconfig symbol");
> break;
> + case T_OPT_ENV:
> + prop_add_env(arg);
> + break;
> }
> }
>
> @@ -331,7 +334,7 @@ void menu_finalize(struct menu *parent)
> prop = sym_get_choice_prop(sym);
> for (ep = &prop->expr; *ep; ep = &(*ep)->left.expr)
> ;
> - *ep = expr_alloc_one(E_CHOICE, NULL);
> + *ep = expr_alloc_one(E_LIST, NULL);
> (*ep)->right.sym = menu->sym;
> }
> if (menu->list && (!menu->prompt || !menu->prompt->text)) {
> Index: linux-2.6/scripts/kconfig/qconf.cc
> ===================================================================
> --- linux-2.6.orig/scripts/kconfig/qconf.cc
> +++ linux-2.6/scripts/kconfig/qconf.cc
> @@ -1083,7 +1083,10 @@ QString ConfigInfoView::debug_info(struc
> debug += "</a><br>";
> break;
> case P_DEFAULT:
> - debug += "default: ";
> + case P_SELECT:
> + case P_ENV:
> + debug += prop_get_type_name(prop->type);
> + debug += ": ";
> expr_print(prop->expr, expr_print_help, &debug, E_NONE);
> debug += "<br>";
> break;
> @@ -1094,16 +1097,6 @@ QString ConfigInfoView::debug_info(struc
> debug += "<br>";
> }
> break;
> - case P_SELECT:
> - debug += "select: ";
> - expr_print(prop->expr, expr_print_help, &debug, E_NONE);
> - debug += "<br>";
> - break;
This part looks OK - did not test it throughly though.

> - case P_RANGE:
> - debug += "range: ";
> - expr_print(prop->expr, expr_print_help, &debug, E_NONE);
> - debug += "<br>";
> - break;
But this parts looks wrong. I have added back the case P_RANGE.
Testing revealed that this was needed/OK.

> default:
> debug += "unknown property: ";
> debug += prop_get_type_name(prop->type);
> Index: linux-2.6/scripts/kconfig/symbol.c
> ===================================================================
> --- linux-2.6.orig/scripts/kconfig/symbol.c
> +++ linux-2.6/scripts/kconfig/symbol.c
> @@ -34,6 +34,8 @@ struct symbol *sym_defconfig_list;
> struct symbol *modules_sym;
> tristate modules_val;
>
> +struct expr *sym_env_list;
> +
> void sym_add_default(struct symbol *sym, const char *def)
> {
> struct property *prop = prop_alloc(P_DEFAULT, sym);
> @@ -54,13 +56,6 @@ void sym_init(void)
>
> uname(&uts);
>
> - sym = sym_lookup("ARCH", 0);
> - sym->type = S_STRING;
> - sym->flags |= SYMBOL_AUTO;
> - p = getenv("ARCH");
> - if (p)
> - sym_add_default(sym, p);
> -
> sym = sym_lookup("KERNELVERSION", 0);
> sym->type = S_STRING;
> sym->flags |= SYMBOL_AUTO;
> @@ -117,6 +112,15 @@ struct property *sym_get_choice_prop(str
> return NULL;
> }
>
> +struct property *sym_get_env_prop(struct symbol *sym)
> +{
> + struct property *prop;
> +
> + for_all_properties(sym, prop, P_ENV)
> + return prop;
> + return NULL;
> +}
> +
> struct property *sym_get_default_prop(struct symbol *sym)
> {
> struct property *prop;
> @@ -347,6 +351,9 @@ void sym_calc_value(struct symbol *sym)
> ;
> }
>
> + if (sym->flags & SYMBOL_AUTO)
> + sym->flags &= ~SYMBOL_WRITE;
> +

Why is this change needed?
It is non-obvious to me so please explain and I will add a comment.

> sym->curr = newval;
> if (sym_is_choice(sym) && newval.tri == yes)
> sym->curr.val = sym_calc_choice(sym);
> @@ -849,7 +856,7 @@ struct property *prop_alloc(enum prop_ty
> struct symbol *prop_get_symbol(struct property *prop)
> {
> if (prop->expr && (prop->expr->type == E_SYMBOL ||
> - prop->expr->type == E_CHOICE))
> + prop->expr->type == E_LIST))
> return prop->expr->left.sym;
> return NULL;
> }
> @@ -859,6 +866,8 @@ const char *prop_get_type_name(enum prop
> switch (type) {
> case P_PROMPT:
> return "prompt";
> + case P_ENV:
> + return "env";
> case P_COMMENT:
> return "comment";
> case P_MENU:
> @@ -876,3 +885,31 @@ const char *prop_get_type_name(enum prop
> }
> return "unknown";
> }
> +
> +void prop_add_env(const char *env)
> +{
> + struct symbol *sym, *sym2;
> + struct property *prop;
> + char *p;
> +
> + sym = current_entry->sym;
> + sym->flags |= SYMBOL_AUTO;
> + for_all_properties(sym, prop, P_ENV) {
> + sym2 = prop_get_symbol(prop);
> + if (strcmp(sym2->name, env))
> + menu_warn(current_entry, "Redefining environment symbol");
I did it like this:
menu_warn(current_entry,
"config %s: redefining environment symbol from '%s' to '%s'",
sym->name, env, sym2->name);

> + return;
> + }
> +
> + prop = prop_alloc(P_ENV, sym);
> + prop->expr = expr_alloc_symbol(sym_lookup(env, 1));
> +
> + sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
> + sym_env_list->right.sym = sym;
> +
> + p = getenv(env);
> + if (p)
> + sym_add_default(sym, p);
> + else
> + menu_warn(current_entry, "environment variable %s undefined", sym->name);
And like this:
menu_warn(current_entry,
"config %s: environment variable '%s' undefined",
sym->name, env);

> +}
> Index: linux-2.6/scripts/kconfig/util.c
> ===================================================================
> --- linux-2.6.orig/scripts/kconfig/util.c
> +++ linux-2.6/scripts/kconfig/util.c
> @@ -29,6 +29,7 @@ struct file *file_lookup(const char *nam
> /* write a dependency file as used by kbuild to track dependencies */
> int file_write_dep(const char *name)
> {
> + struct expr *e;
> struct file *file;
> FILE *out;
>
> @@ -45,8 +46,28 @@ int file_write_dep(const char *name)
> fprintf(out, "\t%s\n", file->name);
> }
> fprintf(out, "\ninclude/config/auto.conf: \\\n"
> - "\t$(deps_config)\n\n"
> - "$(deps_config): ;\n");
> + "\t$(deps_config)\n\n");
> +
> + for (e = sym_env_list; e; e = e->left.expr) {
> + struct property *p;
> + struct symbol *sym, *env_sym;
> + const char *value;
> +
> + sym = e->right.sym;
> + p = sym_get_env_prop(sym);
> + env_sym = prop_get_symbol(p);
> + if (!env_sym)
> + continue;
> + value = sym_get_string_value(sym);
> + if ((sym->type == S_BOOLEAN || sym->type == S_TRISTATE) &&
> + sym_get_tristate_value(sym) == no)
> + value = "";
> + fprintf(out, "ifneq \"$(%s)\" \"%s\"\n", env_sym->name, value);
> + fprintf(out, "include/config/auto.conf: FORCE\n");
> + fprintf(out, "endif\n");
> + }
> +
> + fprintf(out, "\n$(deps_config): ;\n");
> fclose(out);
> rename("..config.tmp", name);
> return 0;
> Index: linux-2.6/scripts/kconfig/zconf.gperf
> ===================================================================
> --- linux-2.6.orig/scripts/kconfig/zconf.gperf
> +++ linux-2.6/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
> %%


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