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authorCatalin Marinas <catalin.marinas@arm.com>2010-06-08 17:25:57 +0100
committerMichal Marek <mmarek@suse.cz>2010-07-02 14:53:09 +0200
commit246cf9c26bf11f2bffbecea6e5bd222eee7b1df8 (patch)
tree29ddd2eaa165dbad9e8760866d782f122f579118
parent60c8eca69f7fb2820677a635d921866f66727fcb (diff)
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kbuild: Warn on selecting symbols with unmet direct dependencies
The "select" statement in Kconfig files allows the enabling of options even if they have unmet direct dependencies (i.e. "depends on" expands to "no"). Currently, the "depends on" clauses are used in calculating the visibility but they do not affect the reverse dependencies in any way. The patch introduces additional tracking of the "depends on" statements and prints a warning on selecting an option if its direct dependencies are not met. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Michal Marek <mmarek@suse.cz>
-rw-r--r--scripts/kconfig/expr.h2
-rw-r--r--scripts/kconfig/menu.c5
-rw-r--r--scripts/kconfig/symbol.c18
3 files changed, 25 insertions, 0 deletions
diff --git a/scripts/kconfig/expr.h b/scripts/kconfig/expr.h
index 891cd9ce9ba..75a31e4552f 100644
--- a/scripts/kconfig/expr.h
+++ b/scripts/kconfig/expr.h
@@ -83,6 +83,7 @@ struct symbol {
tristate visible;
int flags;
struct property *prop;
+ struct expr_value dir_dep;
struct expr_value rev_dep;
};
@@ -163,6 +164,7 @@ struct menu {
struct symbol *sym;
struct property *prompt;
struct expr *dep;
+ struct expr *dir_dep;
unsigned int flags;
char *help;
struct file *file;
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index eef17bacb6b..11799894f3b 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -105,6 +105,7 @@ static struct expr *menu_check_dep(struct expr *e)
void menu_add_dep(struct expr *dep)
{
current_entry->dep = expr_alloc_and(current_entry->dep, menu_check_dep(dep));
+ current_entry->dir_dep = current_entry->dep;
}
void menu_set_type(int type)
@@ -288,6 +289,10 @@ void menu_finalize(struct menu *parent)
for (menu = parent->list; menu; menu = menu->next)
menu_finalize(menu);
} else if (sym) {
+ /* ignore inherited dependencies for dir_dep */
+ sym->dir_dep.expr = expr_transform(expr_copy(parent->dir_dep));
+ sym->dir_dep.expr = expr_eliminate_dups(sym->dir_dep.expr);
+
basedep = parent->prompt ? parent->prompt->visible.expr : NULL;
basedep = expr_trans_compare(basedep, E_UNEQUAL, &symbol_no);
basedep = expr_eliminate_dups(expr_transform(basedep));
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index 2e7a048e0cf..174b230a52b 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -205,6 +205,16 @@ static void sym_calc_visibility(struct symbol *sym)
}
if (sym_is_choice_value(sym))
return;
+ /* defaulting to "yes" if no explicit "depends on" are given */
+ tri = yes;
+ if (sym->dir_dep.expr)
+ tri = expr_calc_value(sym->dir_dep.expr);
+ if (tri == mod)
+ tri = yes;
+ if (sym->dir_dep.tri != tri) {
+ sym->dir_dep.tri = tri;
+ sym_set_changed(sym);
+ }
tri = no;
if (sym->rev_dep.expr)
tri = expr_calc_value(sym->rev_dep.expr);
@@ -321,6 +331,14 @@ void sym_calc_value(struct symbol *sym)
}
}
calc_newval:
+ if (sym->dir_dep.tri == no && sym->rev_dep.tri != no) {
+ fprintf(stderr, "warning: (");
+ expr_fprint(sym->rev_dep.expr, stderr);
+ fprintf(stderr, ") selects %s which has unmet direct dependencies (",
+ sym->name);
+ expr_fprint(sym->dir_dep.expr, stderr);
+ fprintf(stderr, ")\n");
+ }
newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
}
if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)