linux-kernel - [PATCH] kconfig: do not overwrite symbol direct dependency in assignment

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Date:	Wed, 25 May 2011 01:36:44 -0400
From:	Arnaud Lacombe <lacombar@...il.com>
To:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Arnaud Lacombe <lacombar@...il.com>
Subject: [PATCH] kconfig: do not overwrite symbol direct dependency in assignment

Considering the following configuration:

config F
    bool "F"

choice AB
    bool "AB"
config A
    bool "A"
config B
    bool "B"
endchoice

if A
config D
    bool
    default y if F
    select E
config E
    bool "E"
endif

if B
config D
    bool
    default y if F
    select E
config E
    bool "E"
endif

The following configuration:

CONFIG_F=y
CONFIG_A=y
CONFIG_D=y
CONFIG_E=y

emits a spurious warning:

(D) selects E which has unmet direct dependencies (B)

If a symbol appears in two different branch of the tree, it should inherit the
dependency of both parent, not just the last one.

Reported-by: Yann E. Morin <yann.morin.1998@...iens.enib.fr>
Tested-by: Yann E. Morin <yann.morin.1998@...iens.enib.fr>
Signed-off-by: Arnaud Lacombe <lacombar@...il.com>
---
 scripts/kconfig/menu.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 5fdf10d..d0c65e7 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -350,7 +350,7 @@ void menu_finalize(struct menu *parent)
 			last_menu->next = NULL;
 		}
 
-		sym->dir_dep.expr = parent->dep;
+		sym->dir_dep.expr = expr_alloc_or(sym->dir_dep.expr, parent->dep);
 	}
 	for (menu = parent->list; menu; menu = menu->next) {
 		if (sym && sym_is_choice(sym) &&
-- 
1.7.3.4.574.g608b.dirty

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