Currently, Kconfig does not report anything about the recursive
dependency where 'imply' keywords are involved.
[Test Code]
config A
bool "a"
config B
bool "b"
imply A
depends on A
In the code above, Kconfig cannot calculate the symbol values correctly
due to the circular dependency. For example, allyesconfig followed by
syncconfig results in an odd behavior because CONFIG_B becomes visible
in syncconfig.
$ make allyesconfig
scripts/kconfig/conf --allyesconfig Kconfig
#
# configuration written to .config
#
$ cat .config
#
# Automatically generated file; DO NOT EDIT.
# Main menu
#
CONFIG_A=y
$ make syncconfig
scripts/kconfig/conf --syncconfig Kconfig
*
* Restart config...
*
*
* Main menu
*
a (A) [Y/n/?] y
b (B) [N/y/?] (NEW)
To report this correctly, sym_check_expr_deps() should recurse to
not only sym->rev_dep.expr but also sym->implied.expr .
At this moment, sym_check_print_recursive() cannot distinguish
'select' and 'imply' since it does not know the precise context
where the recursive dependency is hit. This will be solved by
the next commit.
Signed-off-by: Masahiro Yamada <yamada.masah...@socionext.com>
---
scripts/kconfig/symbol.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index 4ec8b1f..7de7463a 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -1098,7 +1098,7 @@ static void sym_check_print_recursive(struct symbol
*last_sym)
sym->name ? sym->name : "<choice>",
next_sym->name ? next_sym->name : "<choice>");
} else {
- fprintf(stderr, "%s:%d:\tsymbol %s is selected by %s\n",
+ fprintf(stderr, "%s:%d:\tsymbol %s is selected or
implied by %s\n",
prop->file->name, prop->lineno,
sym->name ? sym->name : "<choice>",
next_sym->name ? next_sym->name : "<choice>");
@@ -1161,8 +1161,13 @@ static struct symbol *sym_check_sym_deps(struct symbol
*sym)
if (sym2)
goto out;
+ sym2 = sym_check_expr_deps(sym->implied.expr);
+ if (sym2)
+ goto out;
+
for (prop = sym->prop; prop; prop = prop->next) {
- if (prop->type == P_CHOICE || prop->type == P_SELECT)
+ if (prop->type == P_CHOICE || prop->type == P_SELECT ||
+ prop->type == P_IMPLY)
continue;
stack.prop = prop;
sym2 = sym_check_expr_deps(prop->visible.expr);
--
2.7.4
