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-rw-r--r--scripts/kconfig/expr.c42
-rw-r--r--scripts/kconfig/symbol.c6
2 files changed, 47 insertions, 1 deletions
diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c
index 330e7c0048a8..65531a7f28a8 100644
--- a/scripts/kconfig/expr.c
+++ b/scripts/kconfig/expr.c
@@ -1013,6 +1013,48 @@ int expr_compare_type(enum expr_type t1, enum expr_type t2)
#endif
}
+static inline struct expr *
+expr_get_leftmost_symbol(const struct expr *e)
+{
+
+ if (e == NULL)
+ return NULL;
+
+ while (e->type != E_SYMBOL)
+ e = e->left.expr;
+
+ return expr_copy(e);
+}
+
+/*
+ * Given expression `e1' and `e2', returns the leaf of the longest
+ * sub-expression of `e1' not containing 'e2.
+ */
+struct expr *expr_simplify_unmet_dep(struct expr *e1, struct expr *e2)
+{
+ struct expr *ret;
+
+ switch (e1->type) {
+ case E_OR:
+ return expr_alloc_and(
+ expr_simplify_unmet_dep(e1->left.expr, e2),
+ expr_simplify_unmet_dep(e1->right.expr, e2));
+ case E_AND: {
+ struct expr *e;
+ e = expr_alloc_and(expr_copy(e1), expr_copy(e2));
+ e = expr_eliminate_dups(e);
+ ret = (!expr_eq(e, e1)) ? e1 : NULL;
+ expr_free(e);
+ break;
+ }
+ default:
+ ret = e1;
+ break;
+ }
+
+ return expr_get_leftmost_symbol(ret);
+}
+
void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *), void *data, int prevtoken)
{
if (!e) {
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index 60830ce4a0a9..fa52e6f44ac4 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -351,12 +351,16 @@ void sym_calc_value(struct symbol *sym)
}
calc_newval:
if (sym->dir_dep.tri == no && sym->rev_dep.tri != no) {
+ struct expr *e;
+ e = expr_simplify_unmet_dep(sym->rev_dep.expr,
+ sym->dir_dep.expr);
fprintf(stderr, "warning: (");
- expr_fprint(sym->rev_dep.expr, stderr);
+ expr_fprint(e, stderr);
fprintf(stderr, ") selects %s which has unmet direct dependencies (",
sym->name);
expr_fprint(sym->dir_dep.expr, stderr);
fprintf(stderr, ")\n");
+ expr_free(e);
}
newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);
}