kernel_optimize_test/scripts/kconfig
Dirk Gouders e983b7b17a kconfig/menu.c: fix multiple references to expressions in menu_add_prop()
menu_add_prop() applies upper menus' visibilities to actual prompts
by AND-ing the prompts visibilities with the upper menus ones.

This creates a further reference to the menu's visibilities and when
the expression reduction functions do their work, they may remove or
modify expressions that have multiple references, thus causing
unpredictable side-effects.

The following example Kconfig constructs a case where this causes
problems: a menu and a prompt which's visibilities depend on the same
symbol.  When invoking mconf with this Kconfig and pressing "Z" we
see a problem caused by a free'd expression still referenced by the
menu's visibility:

------------------------------------------------------------------------
mainmenu "Kconfig Testing Configuration"

config VISIBLE
	def_bool n

config Placeholder
	bool "Place holder"

menu "Invisible"
	visible if VISIBLE

config TEST_VAR
	bool "Test option" if VISIBLE

endmenu
------------------------------------------------------------------------

This patch fixes this problem by creating copies of the menu's
visibility expressions before AND-ing them with the prompt's one.

Signed-off-by: Dirk Gouders <dirk@gouders.net>
[yann.morin.1998@free.fr: move variable into its block-scope,
                          keep lines <80 chars, typo]
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
2013-05-30 00:14:01 +02:00
..
lxdialog mconf: handle keys in empty dialogs 2013-05-30 00:13:32 +02:00
.gitignore
check.sh
conf.c
confdata.c
expr.c
expr.h
gconf.c
gconf.glade
images.c
kxgettext.c
list.h
lkc_proto.h
lkc.h
Makefile
mconf.c mconf: handle keys in empty dialogs 2013-05-30 00:13:32 +02:00
menu.c kconfig/menu.c: fix multiple references to expressions in menu_add_prop() 2013-05-30 00:14:01 +02:00
merge_config.sh
nconf.c
nconf.gui.c
nconf.h
POTFILES.in
qconf.cc
qconf.h
streamline_config.pl
symbol.c
util.c
zconf.gperf
zconf.hash.c_shipped
zconf.l
zconf.lex.c_shipped
zconf.tab.c_shipped
zconf.y