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Date:	Thu, 14 May 2015 05:30:15 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Andy Lutomirski <luto@...capital.net>,
	Bertrand Jacquin <beber@...eeweb.net>,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Iulia Manda <iulia.manda21@...il.com>,
	Pranith Kumar <bobby.prani@...il.com>,
	Clark Williams <clark.williams@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	Randy Dunlap <rdunlap@...radead.org>,
	Paul Bolle <pebolle@...cali.nl>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] kconfig: Introduce "showif" to factor out conditions
 on visibility

On Wed, May 13, 2015 at 04:38:23PM -0700, Josh Triplett wrote:
> kconfig implicitly creates a submenu whenever a series of symbols all
> have dependencies or prompt-visibility expressions that all depend on a
> preceeding symbol.  For instance, the series of symbols following
> "menuconfig EXPERT" that all have "if EXPERT" on their prompt will all
> appear as a submenu of EXPERT.
> 
> However, this implicit submenuing will break if any intervening symbol
> loses its "if EXPERT"; doing so causes the subsequent symbols to appear
> in the parent menu ("General setup").  This has happened many times, and
> it's easy to miss that the entire block should have that same
> expression.
> 
> For submenus created from "depends" dependencies, these can be converted
> to a single wrapping "if expr ... endif" block around all the submenu
> items.  However, there's no equivalent for invisible items, for which
> the prompt is hidden but the symbol may potentially be enabled.  For
> instance, many items in the EXPERT menu are hidden if EXPERT is
> disabled, but they have "default y" or are determined by some other
> expression.
> 
> To handle this case, introduce a new kconfig construct, "showif", which
> does the same thing as "if" but for visibility expressions rather than
> dependencies.  Every symbol in a "showif expr ... endif" block
> effectively has "if expr" added to its prompt.
> 
> Use that new construct to simplify the expert menu.  Now, making a
> symbol no longer invisible when !EXPERT requires moving it out of the
> EXPERT menu, which makes it more difficult to break the EXPERT menu.
> 
> Signed-off-by: Josh Triplett <josh@...htriplett.org>

Having this would have simplified RCU_EXPERT.

Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

> ---
>  init/Kconfig.expert                  |  44 +--
>  scripts/kconfig/menu.c               |   4 +-
>  scripts/kconfig/zconf.gperf          |   1 +
>  scripts/kconfig/zconf.hash.c_shipped | 258 ++++++++--------
>  scripts/kconfig/zconf.tab.c_shipped  | 561 +++++++++++++++++++----------------
>  scripts/kconfig/zconf.y              |  28 +-
>  6 files changed, 483 insertions(+), 413 deletions(-)
> 
> diff --git a/init/Kconfig.expert b/init/Kconfig.expert
> index c84a372..fb3c3aa 100644
> --- a/init/Kconfig.expert
> +++ b/init/Kconfig.expert
> @@ -8,15 +8,17 @@ menuconfig EXPERT
>            environments which can tolerate a "non-standard" kernel.
>            Only use this if you really know what you are doing.
> 
> +showif EXPERT
> +
>  config UID16
> -	bool "Enable 16-bit UID system calls" if EXPERT
> +	bool "Enable 16-bit UID system calls"
>  	depends on HAVE_UID16 && MULTIUSER
>  	default y
>  	help
>  	  This enables the legacy 16-bit UID syscall wrappers.
> 
>  config MULTIUSER
> -	bool "Multiple users, groups and capabilities support" if EXPERT
> +	bool "Multiple users, groups and capabilities support"
>  	default y
>  	help
>  	  This option enables support for non-root users, groups and
> @@ -30,7 +32,7 @@ config MULTIUSER
>  	  If unsure, say Y here.
> 
>  config SGETMASK_SYSCALL
> -	bool "sgetmask/ssetmask syscalls support" if EXPERT
> +	bool "sgetmask/ssetmask syscalls support"
>  	def_bool PARISC || MN10300 || BLACKFIN || M68K || PPC || MIPS || X86 || SPARC || CRIS || MICROBLAZE || SUPERH
>  	---help---
>  	  sys_sgetmask and sys_ssetmask are obsolete system calls
> @@ -40,7 +42,7 @@ config SGETMASK_SYSCALL
>  	  If unsure, leave the default option here.
> 
>  config SYSFS_SYSCALL
> -	bool "Sysfs syscall support" if EXPERT
> +	bool "Sysfs syscall support"
>  	default y
>  	---help---
>  	  sys_sysfs is an obsolete system call no longer supported in libc.
> @@ -50,7 +52,7 @@ config SYSFS_SYSCALL
>  	  If unsure say Y here.
> 
>  config SYSCTL_SYSCALL
> -	bool "Sysctl syscall support" if EXPERT
> +	bool "Sysctl syscall support"
>  	depends on PROC_SYSCTL
>  	default n
>  	select SYSCTL
> @@ -67,7 +69,7 @@ config SYSCTL_SYSCALL
>  	  If unsure say N here.
> 
>  config KALLSYMS
> -	 bool "Load all symbols for debugging/ksymoops" if EXPERT
> +	 bool "Load all symbols for debugging/ksymoops"
>  	 default y
>  	 help
>  	   Say Y here to let the kernel print out symbolic crash information and
> @@ -93,7 +95,7 @@ config KALLSYMS_ALL
> 
>  config PRINTK
>  	default y
> -	bool "Enable support for printk" if EXPERT
> +	bool "Enable support for printk"
>  	select IRQ_WORK
>  	help
>  	  This option enables normal printk support. Removing it
> @@ -103,7 +105,7 @@ config PRINTK
>  	  strongly discouraged.
> 
>  config BUG
> -	bool "BUG() support" if EXPERT
> +	bool "BUG() support"
>  	default y
>  	help
>            Disabling this option eliminates support for BUG and WARN, reducing
> @@ -115,13 +117,13 @@ config BUG
>  config ELF_CORE
>  	depends on COREDUMP
>  	default y
> -	bool "Enable ELF core dumps" if EXPERT
> +	bool "Enable ELF core dumps"
>  	help
>  	  Enable support for generating core dumps. Disabling saves about 4k.
> 
> 
>  config PCSPKR_PLATFORM
> -	bool "Enable PC-Speaker support" if EXPERT
> +	bool "Enable PC-Speaker support"
>  	depends on HAVE_PCSPKR_PLATFORM
>  	select I8253_LOCK
>  	default y
> @@ -131,14 +133,14 @@ config PCSPKR_PLATFORM
> 
>  config BASE_FULL
>  	default y
> -	bool "Enable full-sized data structures for core" if EXPERT
> +	bool "Enable full-sized data structures for core"
>  	help
>  	  Disabling this option reduces the size of miscellaneous core
>  	  kernel data structures. This saves memory on small machines,
>  	  but may reduce performance.
> 
>  config FUTEX
> -	bool "Enable futex support" if EXPERT
> +	bool "Enable futex support"
>  	default y
>  	select RT_MUTEXES
>  	help
> @@ -155,7 +157,7 @@ config HAVE_FUTEX_CMPXCHG
>  	  checks.
> 
>  config EPOLL
> -	bool "Enable eventpoll support" if EXPERT
> +	bool "Enable eventpoll support"
>  	default y
>  	select ANON_INODES
>  	help
> @@ -163,7 +165,7 @@ config EPOLL
>  	  support for epoll family of system calls.
> 
>  config SIGNALFD
> -	bool "Enable signalfd() system call" if EXPERT
> +	bool "Enable signalfd() system call"
>  	select ANON_INODES
>  	default y
>  	help
> @@ -173,7 +175,7 @@ config SIGNALFD
>  	  If unsure, say Y.
> 
>  config TIMERFD
> -	bool "Enable timerfd() system call" if EXPERT
> +	bool "Enable timerfd() system call"
>  	select ANON_INODES
>  	default y
>  	help
> @@ -183,7 +185,7 @@ config TIMERFD
>  	  If unsure, say Y.
> 
>  config EVENTFD
> -	bool "Enable eventfd() system call" if EXPERT
> +	bool "Enable eventfd() system call"
>  	select ANON_INODES
>  	default y
>  	help
> @@ -193,7 +195,7 @@ config EVENTFD
>  	  If unsure, say Y.
> 
>  config SHMEM
> -	bool "Use full shmem filesystem" if EXPERT
> +	bool "Use full shmem filesystem"
>  	default y
>  	depends on MMU
>  	help
> @@ -204,7 +206,7 @@ config SHMEM
>  	  which may be appropriate on small systems without swap.
> 
>  config AIO
> -	bool "Enable AIO support" if EXPERT
> +	bool "Enable AIO support"
>  	default y
>  	help
>  	  This option enables POSIX asynchronous I/O which may by used
> @@ -212,7 +214,7 @@ config AIO
>  	  this option saves about 7k.
> 
>  config ADVISE_SYSCALLS
> -	bool "Enable madvise/fadvise syscalls" if EXPERT
> +	bool "Enable madvise/fadvise syscalls"
>  	default y
>  	help
>  	  This option enables the madvise and fadvise syscalls, used by
> @@ -223,9 +225,11 @@ config ADVISE_SYSCALLS
> 
>  config PCI_QUIRKS
>  	default y
> -	bool "Enable PCI quirk workarounds" if EXPERT
> +	bool "Enable PCI quirk workarounds"
>  	depends on PCI
>  	help
>  	  This enables workarounds for various PCI chipset
>  	  bugs/quirks. Disable this only if your target machine is
>  	  unaffected by PCI quirks.
> +
> +endif # showif EXPERT
> diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
> index b05cc3d..75b7467 100644
> --- a/scripts/kconfig/menu.c
> +++ b/scripts/kconfig/menu.c
> @@ -344,7 +344,9 @@ void menu_finalize(struct menu *parent)
>  		basedep = expr_eliminate_dups(expr_transform(basedep));
>  		last_menu = NULL;
>  		for (menu = parent->next; menu; menu = menu->next) {
> -			dep = menu->prompt ? menu->prompt->visible.expr : menu->dep;
> +			dep = menu->prompt ? menu->prompt->visible.expr
> +			    : menu->visibility ? menu->visibility
> +			    : menu->dep;
>  			if (!expr_contains_symbol(dep, sym))
>  				break;
>  			if (expr_depends_symbol(dep, sym))
> diff --git a/scripts/kconfig/zconf.gperf b/scripts/kconfig/zconf.gperf
> index b6ac02d..fd602b5 100644
> --- a/scripts/kconfig/zconf.gperf
> +++ b/scripts/kconfig/zconf.gperf
> @@ -23,6 +23,7 @@ config,		T_CONFIG,	TF_COMMAND
>  menuconfig,	T_MENUCONFIG,	TF_COMMAND
>  help,		T_HELP,		TF_COMMAND
>  if,		T_IF,		TF_COMMAND|TF_PARAM
> +showif,		T_SHOWIF,	TF_COMMAND
>  endif,		T_ENDIF,	TF_COMMAND
>  depends,	T_DEPENDS,	TF_COMMAND
>  optional,	T_OPTIONAL,	TF_COMMAND
> diff --git a/scripts/kconfig/zconf.hash.c_shipped b/scripts/kconfig/zconf.hash.c_shipped
> index c77a8ef..eab7830 100644
> --- a/scripts/kconfig/zconf.hash.c_shipped
> +++ b/scripts/kconfig/zconf.hash.c_shipped
> @@ -32,7 +32,7 @@
>  struct kconf_id;
> 
>  static const struct kconf_id *kconf_id_lookup(register const char *str, register unsigned int len);
> -/* maximum key range = 71, duplicates = 0 */
> +/* maximum key range = 53, duplicates = 0 */
> 
>  #ifdef __GNUC__
>  __inline
> @@ -46,32 +46,32 @@ kconf_id_hash (register const char *str, register unsigned int len)
>  {
>    static const unsigned char asso_values[] =
>      {
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73,  5, 25, 25,
> -       0,  0,  0,  5,  0,  0, 73, 73,  5,  0,
> -      10,  5, 45, 73, 20, 20,  0, 15, 15, 73,
> -      20,  5, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73, 73, 73, 73, 73,
> -      73, 73, 73, 73, 73, 73
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55,  5, 15, 15,
> +       0,  0,  0,  0,  0,  0, 55, 55, 15, 15,
> +      20,  5, 35, 55,  0,  0,  0, 10, 25, 55,
> +       5,  5, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55, 55, 55, 55, 55,
> +      55, 55, 55, 55, 55, 55
>      };
>    register int hval = len;
> 
> @@ -93,72 +93,74 @@ struct kconf_id_strings_t
>      char kconf_id_strings_str2[sizeof("if")];
>      char kconf_id_strings_str3[sizeof("int")];
>      char kconf_id_strings_str5[sizeof("endif")];
> +    char kconf_id_strings_str6[sizeof("string")];
>      char kconf_id_strings_str7[sizeof("default")];
>      char kconf_id_strings_str8[sizeof("tristate")];
>      char kconf_id_strings_str9[sizeof("endchoice")];
> +    char kconf_id_strings_str11[sizeof("showif")];
>      char kconf_id_strings_str12[sizeof("def_tristate")];
> -    char kconf_id_strings_str13[sizeof("def_bool")];
> +    char kconf_id_strings_str13[sizeof("hex")];
>      char kconf_id_strings_str14[sizeof("defconfig_list")];
> -    char kconf_id_strings_str17[sizeof("on")];
> -    char kconf_id_strings_str18[sizeof("optional")];
> -    char kconf_id_strings_str21[sizeof("option")];
> -    char kconf_id_strings_str22[sizeof("endmenu")];
> -    char kconf_id_strings_str23[sizeof("mainmenu")];
> -    char kconf_id_strings_str25[sizeof("menuconfig")];
> -    char kconf_id_strings_str27[sizeof("modules")];
> -    char kconf_id_strings_str28[sizeof("allnoconfig_y")];
> -    char kconf_id_strings_str29[sizeof("menu")];
> -    char kconf_id_strings_str31[sizeof("select")];
> -    char kconf_id_strings_str32[sizeof("comment")];
> -    char kconf_id_strings_str33[sizeof("env")];
> -    char kconf_id_strings_str35[sizeof("range")];
> -    char kconf_id_strings_str36[sizeof("choice")];
> +    char kconf_id_strings_str16[sizeof("source")];
> +    char kconf_id_strings_str17[sizeof("endmenu")];
> +    char kconf_id_strings_str21[sizeof("select")];
> +    char kconf_id_strings_str22[sizeof("modules")];
> +    char kconf_id_strings_str23[sizeof("def_bool")];
> +    char kconf_id_strings_str25[sizeof("range")];
> +    char kconf_id_strings_str26[sizeof("choice")];
> +    char kconf_id_strings_str27[sizeof("on")];
> +    char kconf_id_strings_str28[sizeof("optional")];
> +    char kconf_id_strings_str31[sizeof("option")];
> +    char kconf_id_strings_str32[sizeof("visible")];
> +    char kconf_id_strings_str33[sizeof("mainmenu")];
> +    char kconf_id_strings_str37[sizeof("comment")];
> +    char kconf_id_strings_str38[sizeof("allnoconfig_y")];
>      char kconf_id_strings_str39[sizeof("bool")];
> -    char kconf_id_strings_str41[sizeof("source")];
> -    char kconf_id_strings_str42[sizeof("visible")];
> -    char kconf_id_strings_str43[sizeof("hex")];
> -    char kconf_id_strings_str46[sizeof("config")];
> +    char kconf_id_strings_str41[sizeof("config")];
> +    char kconf_id_strings_str42[sizeof("depends")];
> +    char kconf_id_strings_str45[sizeof("menuconfig")];
> +    char kconf_id_strings_str46[sizeof("prompt")];
>      char kconf_id_strings_str47[sizeof("boolean")];
> -    char kconf_id_strings_str51[sizeof("string")];
> +    char kconf_id_strings_str49[sizeof("menu")];
> +    char kconf_id_strings_str53[sizeof("env")];
>      char kconf_id_strings_str54[sizeof("help")];
> -    char kconf_id_strings_str56[sizeof("prompt")];
> -    char kconf_id_strings_str72[sizeof("depends")];
>    };
>  static const struct kconf_id_strings_t kconf_id_strings_contents =
>    {
>      "if",
>      "int",
>      "endif",
> +    "string",
>      "default",
>      "tristate",
>      "endchoice",
> +    "showif",
>      "def_tristate",
> -    "def_bool",
> +    "hex",
>      "defconfig_list",
> +    "source",
> +    "endmenu",
> +    "select",
> +    "modules",
> +    "def_bool",
> +    "range",
> +    "choice",
>      "on",
>      "optional",
>      "option",
> -    "endmenu",
> +    "visible",
>      "mainmenu",
> -    "menuconfig",
> -    "modules",
> -    "allnoconfig_y",
> -    "menu",
> -    "select",
>      "comment",
> -    "env",
> -    "range",
> -    "choice",
> +    "allnoconfig_y",
>      "bool",
> -    "source",
> -    "visible",
> -    "hex",
>      "config",
> -    "boolean",
> -    "string",
> -    "help",
> +    "depends",
> +    "menuconfig",
>      "prompt",
> -    "depends"
> +    "boolean",
> +    "menu",
> +    "env",
> +    "help"
>    };
>  #define kconf_id_strings ((const char *) &kconf_id_strings_contents)
>  #ifdef __GNUC__
> @@ -172,11 +174,11 @@ kconf_id_lookup (register const char *str, register unsigned int len)
>  {
>    enum
>      {
> -      TOTAL_KEYWORDS = 33,
> +      TOTAL_KEYWORDS = 34,
>        MIN_WORD_LENGTH = 2,
>        MAX_WORD_LENGTH = 14,
>        MIN_HASH_VALUE = 2,
> -      MAX_HASH_VALUE = 72
> +      MAX_HASH_VALUE = 54
>      };
> 
>    static const struct kconf_id wordlist[] =
> @@ -184,87 +186,83 @@ kconf_id_lookup (register const char *str, register unsigned int len)
>        {-1}, {-1},
>  #line 25 "scripts/kconfig/zconf.gperf"
>        {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str2,		T_IF,		TF_COMMAND|TF_PARAM},
> -#line 36 "scripts/kconfig/zconf.gperf"
> +#line 37 "scripts/kconfig/zconf.gperf"
>        {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str3,		T_TYPE,		TF_COMMAND, S_INT},
>        {-1},
> -#line 26 "scripts/kconfig/zconf.gperf"
> +#line 27 "scripts/kconfig/zconf.gperf"
>        {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str5,		T_ENDIF,	TF_COMMAND},
> -      {-1},
> -#line 29 "scripts/kconfig/zconf.gperf"
> +#line 39 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str6,		T_TYPE,		TF_COMMAND, S_STRING},
> +#line 30 "scripts/kconfig/zconf.gperf"
>        {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str7,	T_DEFAULT,	TF_COMMAND, S_UNKNOWN},
> -#line 31 "scripts/kconfig/zconf.gperf"
> +#line 32 "scripts/kconfig/zconf.gperf"
>        {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str8,	T_TYPE,		TF_COMMAND, S_TRISTATE},
>  #line 20 "scripts/kconfig/zconf.gperf"
>        {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str9,	T_ENDCHOICE,	TF_COMMAND},
> -      {-1}, {-1},
> -#line 32 "scripts/kconfig/zconf.gperf"
> +      {-1},
> +#line 26 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str11,		T_SHOWIF,	TF_COMMAND},
> +#line 33 "scripts/kconfig/zconf.gperf"
>        {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str12,	T_DEFAULT,	TF_COMMAND, S_TRISTATE},
> -#line 35 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str13,	T_DEFAULT,	TF_COMMAND, S_BOOLEAN},
> -#line 45 "scripts/kconfig/zconf.gperf"
> +#line 38 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str13,		T_TYPE,		TF_COMMAND, S_HEX},
> +#line 46 "scripts/kconfig/zconf.gperf"
>        {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str14,	T_OPT_DEFCONFIG_LIST,TF_OPTION},
> +      {-1},
> +#line 18 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str16,		T_SOURCE,	TF_COMMAND},
> +#line 17 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str17,	T_ENDMENU,	TF_COMMAND},
> +      {-1}, {-1}, {-1},
> +#line 40 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str21,		T_SELECT,	TF_COMMAND},
> +#line 45 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str22,	T_OPT_MODULES,	TF_OPTION},
> +#line 36 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str23,	T_DEFAULT,	TF_COMMAND, S_BOOLEAN},
> +      {-1},
> +#line 41 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str25,		T_RANGE,	TF_COMMAND},
> +#line 19 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str26,		T_CHOICE,	TF_COMMAND},
> +#line 44 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str27,		T_ON,		TF_PARAM},
> +#line 29 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str28,	T_OPTIONAL,	TF_COMMAND},
>        {-1}, {-1},
>  #line 43 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str17,		T_ON,		TF_PARAM},
> -#line 28 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str18,	T_OPTIONAL,	TF_COMMAND},
> -      {-1}, {-1},
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str31,		T_OPTION,	TF_COMMAND},
>  #line 42 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str21,		T_OPTION,	TF_COMMAND},
> -#line 17 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str22,	T_ENDMENU,	TF_COMMAND},
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str32,	T_VISIBLE,	TF_COMMAND},
>  #line 15 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str23,	T_MAINMENU,	TF_COMMAND},
> -      {-1},
> -#line 23 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str25,	T_MENUCONFIG,	TF_COMMAND},
> -      {-1},
> -#line 44 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str27,	T_OPT_MODULES,	TF_OPTION},
> -#line 47 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str28,	T_OPT_ALLNOCONFIG_Y,TF_OPTION},
> -#line 16 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str29,		T_MENU,		TF_COMMAND},
> -      {-1},
> -#line 39 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str31,		T_SELECT,	TF_COMMAND},
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str33,	T_MAINMENU,	TF_COMMAND},
> +      {-1}, {-1}, {-1},
>  #line 21 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str32,	T_COMMENT,	TF_COMMAND},
> -#line 46 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str33,		T_OPT_ENV,	TF_OPTION},
> -      {-1},
> -#line 40 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str35,		T_RANGE,	TF_COMMAND},
> -#line 19 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str36,		T_CHOICE,	TF_COMMAND},
> -      {-1}, {-1},
> -#line 33 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str37,	T_COMMENT,	TF_COMMAND},
> +#line 48 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str38,	T_OPT_ALLNOCONFIG_Y,TF_OPTION},
> +#line 34 "scripts/kconfig/zconf.gperf"
>        {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str39,		T_TYPE,		TF_COMMAND, S_BOOLEAN},
>        {-1},
> -#line 18 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str41,		T_SOURCE,	TF_COMMAND},
> -#line 41 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str42,	T_VISIBLE,	TF_COMMAND},
> -#line 37 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str43,		T_TYPE,		TF_COMMAND, S_HEX},
> -      {-1}, {-1},
>  #line 22 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str46,		T_CONFIG,	TF_COMMAND},
> -#line 34 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str41,		T_CONFIG,	TF_COMMAND},
> +#line 28 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str42,	T_DEPENDS,	TF_COMMAND},
> +      {-1}, {-1},
> +#line 23 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str45,	T_MENUCONFIG,	TF_COMMAND},
> +#line 31 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str46,		T_PROMPT,	TF_COMMAND},
> +#line 35 "scripts/kconfig/zconf.gperf"
>        {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str47,	T_TYPE,		TF_COMMAND, S_BOOLEAN},
> +      {-1},
> +#line 16 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str49,		T_MENU,		TF_COMMAND},
>        {-1}, {-1}, {-1},
> -#line 38 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str51,		T_TYPE,		TF_COMMAND, S_STRING},
> -      {-1}, {-1},
> +#line 47 "scripts/kconfig/zconf.gperf"
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str53,		T_OPT_ENV,	TF_OPTION},
>  #line 24 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str54,		T_HELP,		TF_COMMAND},
> -      {-1},
> -#line 30 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str56,		T_PROMPT,	TF_COMMAND},
> -      {-1}, {-1}, {-1}, {-1}, {-1}, {-1}, {-1}, {-1}, {-1},
> -      {-1}, {-1}, {-1}, {-1}, {-1}, {-1},
> -#line 27 "scripts/kconfig/zconf.gperf"
> -      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str72,	T_DEPENDS,	TF_COMMAND}
> +      {(int)(long)&((struct kconf_id_strings_t *)0)->kconf_id_strings_str54,		T_HELP,		TF_COMMAND}
>      };
> 
>    if (len <= MAX_WORD_LENGTH && len >= MIN_WORD_LENGTH)
> @@ -285,5 +283,5 @@ kconf_id_lookup (register const char *str, register unsigned int len)
>      }
>    return 0;
>  }
> -#line 48 "scripts/kconfig/zconf.gperf"
> +#line 49 "scripts/kconfig/zconf.gperf"
> 
> diff --git a/scripts/kconfig/zconf.tab.c_shipped b/scripts/kconfig/zconf.tab.c_shipped
> index 0864c7d..c7d6ced 100644
> --- a/scripts/kconfig/zconf.tab.c_shipped
> +++ b/scripts/kconfig/zconf.tab.c_shipped
> @@ -148,27 +148,28 @@ extern int zconfdebug;
>      T_HELP = 267,
>      T_HELPTEXT = 268,
>      T_IF = 269,
> -    T_ENDIF = 270,
> -    T_DEPENDS = 271,
> -    T_OPTIONAL = 272,
> -    T_PROMPT = 273,
> -    T_TYPE = 274,
> -    T_DEFAULT = 275,
> -    T_SELECT = 276,
> -    T_RANGE = 277,
> -    T_VISIBLE = 278,
> -    T_OPTION = 279,
> -    T_ON = 280,
> -    T_WORD = 281,
> -    T_WORD_QUOTE = 282,
> -    T_UNEQUAL = 283,
> -    T_CLOSE_PAREN = 284,
> -    T_OPEN_PAREN = 285,
> -    T_EOL = 286,
> -    T_OR = 287,
> -    T_AND = 288,
> -    T_EQUAL = 289,
> -    T_NOT = 290
> +    T_SHOWIF = 270,
> +    T_ENDIF = 271,
> +    T_DEPENDS = 272,
> +    T_OPTIONAL = 273,
> +    T_PROMPT = 274,
> +    T_TYPE = 275,
> +    T_DEFAULT = 276,
> +    T_SELECT = 277,
> +    T_RANGE = 278,
> +    T_VISIBLE = 279,
> +    T_OPTION = 280,
> +    T_ON = 281,
> +    T_WORD = 282,
> +    T_WORD_QUOTE = 283,
> +    T_UNEQUAL = 284,
> +    T_CLOSE_PAREN = 285,
> +    T_OPEN_PAREN = 286,
> +    T_EOL = 287,
> +    T_OR = 288,
> +    T_AND = 289,
> +    T_EQUAL = 290,
> +    T_NOT = 291
>    };
>  #endif
> 
> @@ -447,21 +448,21 @@ union yyalloc
>  /* YYFINAL -- State number of the termination state.  */
>  #define YYFINAL  11
>  /* YYLAST -- Last index in YYTABLE.  */
> -#define YYLAST   290
> +#define YYLAST   303
> 
>  /* YYNTOKENS -- Number of terminals.  */
> -#define YYNTOKENS  36
> +#define YYNTOKENS  37
>  /* YYNNTS -- Number of nonterminals.  */
> -#define YYNNTS  50
> +#define YYNNTS  53
>  /* YYNRULES -- Number of rules.  */
> -#define YYNRULES  118
> +#define YYNRULES  122
>  /* YYNSTATES -- Number of states.  */
> -#define YYNSTATES  191
> +#define YYNSTATES  199
> 
>  /* YYTRANSLATE[YYX] -- Symbol number corresponding to YYX as returned
>     by yylex, with out-of-bounds checking.  */
>  #define YYUNDEFTOK  2
> -#define YYMAXUTOK   290
> +#define YYMAXUTOK   291
> 
>  #define YYTRANSLATE(YYX)                                                \
>    ((unsigned int) (YYX) <= YYMAXUTOK ? yytranslate[YYX] : YYUNDEFTOK)
> @@ -499,25 +500,26 @@ static const yytype_uint8 yytranslate[] =
>         5,     6,     7,     8,     9,    10,    11,    12,    13,    14,
>        15,    16,    17,    18,    19,    20,    21,    22,    23,    24,
>        25,    26,    27,    28,    29,    30,    31,    32,    33,    34,
> -      35
> +      35,    36
>  };
> 
>  #if YYDEBUG
>    /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
>  static const yytype_uint16 yyrline[] =
>  {
> -       0,   103,   103,   103,   105,   105,   107,   109,   110,   111,
> -     112,   113,   114,   118,   122,   122,   122,   122,   122,   122,
> -     122,   122,   126,   127,   128,   129,   130,   131,   135,   136,
> -     142,   150,   156,   164,   174,   176,   177,   178,   179,   180,
> -     181,   184,   192,   198,   208,   214,   220,   223,   225,   236,
> -     237,   242,   251,   256,   264,   267,   269,   270,   271,   272,
> -     273,   276,   282,   293,   299,   309,   311,   316,   324,   332,
> -     335,   337,   338,   339,   344,   351,   358,   363,   371,   374,
> -     376,   377,   378,   381,   389,   396,   403,   409,   416,   418,
> -     419,   420,   423,   431,   433,   434,   437,   444,   446,   451,
> -     452,   455,   456,   457,   461,   462,   465,   466,   469,   470,
> -     471,   472,   473,   474,   475,   478,   479,   482,   483
> +       0,   104,   104,   104,   106,   106,   108,   110,   111,   112,
> +     113,   114,   115,   119,   123,   123,   123,   123,   123,   123,
> +     123,   123,   127,   128,   129,   130,   131,   132,   133,   137,
> +     138,   144,   152,   158,   166,   176,   178,   179,   180,   181,
> +     182,   183,   186,   194,   200,   210,   216,   222,   225,   227,
> +     238,   239,   244,   253,   258,   266,   269,   271,   272,   273,
> +     274,   275,   278,   284,   295,   301,   311,   313,   318,   326,
> +     334,   342,   350,   353,   356,   358,   359,   360,   365,   372,
> +     379,   384,   392,   395,   397,   398,   399,   402,   410,   417,
> +     424,   430,   437,   439,   440,   441,   444,   452,   454,   455,
> +     458,   465,   467,   472,   473,   476,   477,   478,   482,   483,
> +     486,   487,   490,   491,   492,   493,   494,   495,   496,   499,
> +     500,   503,   504
>  };
>  #endif
> 
> @@ -528,17 +530,18 @@ static const char *const yytname[] =
>  {
>    "$end", "error", "$undefined", "T_MAINMENU", "T_MENU", "T_ENDMENU",
>    "T_SOURCE", "T_CHOICE", "T_ENDCHOICE", "T_COMMENT", "T_CONFIG",
> -  "T_MENUCONFIG", "T_HELP", "T_HELPTEXT", "T_IF", "T_ENDIF", "T_DEPENDS",
> -  "T_OPTIONAL", "T_PROMPT", "T_TYPE", "T_DEFAULT", "T_SELECT", "T_RANGE",
> -  "T_VISIBLE", "T_OPTION", "T_ON", "T_WORD", "T_WORD_QUOTE", "T_UNEQUAL",
> -  "T_CLOSE_PAREN", "T_OPEN_PAREN", "T_EOL", "T_OR", "T_AND", "T_EQUAL",
> -  "T_NOT", "$accept", "input", "start", "stmt_list", "option_name",
> -  "common_stmt", "option_error", "config_entry_start", "config_stmt",
> -  "menuconfig_entry_start", "menuconfig_stmt", "config_option_list",
> -  "config_option", "symbol_option", "symbol_option_list",
> -  "symbol_option_arg", "choice", "choice_entry", "choice_end",
> -  "choice_stmt", "choice_option_list", "choice_option", "choice_block",
> -  "if_entry", "if_end", "if_stmt", "if_block", "mainmenu_stmt", "menu",
> +  "T_MENUCONFIG", "T_HELP", "T_HELPTEXT", "T_IF", "T_SHOWIF", "T_ENDIF",
> +  "T_DEPENDS", "T_OPTIONAL", "T_PROMPT", "T_TYPE", "T_DEFAULT", "T_SELECT",
> +  "T_RANGE", "T_VISIBLE", "T_OPTION", "T_ON", "T_WORD", "T_WORD_QUOTE",
> +  "T_UNEQUAL", "T_CLOSE_PAREN", "T_OPEN_PAREN", "T_EOL", "T_OR", "T_AND",
> +  "T_EQUAL", "T_NOT", "$accept", "input", "start", "stmt_list",
> +  "option_name", "common_stmt", "option_error", "config_entry_start",
> +  "config_stmt", "menuconfig_entry_start", "menuconfig_stmt",
> +  "config_option_list", "config_option", "symbol_option",
> +  "symbol_option_list", "symbol_option_arg", "choice", "choice_entry",
> +  "choice_end", "choice_stmt", "choice_option_list", "choice_option",
> +  "choice_block", "if_entry", "showif_entry", "if_end", "showif_end",
> +  "if_stmt", "showif_stmt", "if_block", "mainmenu_stmt", "menu",
>    "menu_entry", "menu_end", "menu_stmt", "menu_block", "source_stmt",
>    "comment", "comment_stmt", "help_start", "help", "depends_list",
>    "depends", "visibility_list", "visible", "prompt_stmt_opt", "prompt",
> @@ -554,16 +557,16 @@ static const yytype_uint16 yytoknum[] =
>         0,   256,   257,   258,   259,   260,   261,   262,   263,   264,
>       265,   266,   267,   268,   269,   270,   271,   272,   273,   274,
>       275,   276,   277,   278,   279,   280,   281,   282,   283,   284,
> -     285,   286,   287,   288,   289,   290
> +     285,   286,   287,   288,   289,   290,   291
>  };
>  # endif
> 
> -#define YYPACT_NINF -90
> +#define YYPACT_NINF -105
> 
>  #define yypact_value_is_default(Yystate) \
> -  (!!((Yystate) == (-90)))
> +  (!!((Yystate) == (-105)))
> 
> -#define YYTABLE_NINF -86
> +#define YYTABLE_NINF -90
> 
>  #define yytable_value_is_error(Yytable_value) \
>    0
> @@ -572,26 +575,26 @@ static const yytype_uint16 yytoknum[] =
>       STATE-NUM.  */
>  static const yytype_int16 yypact[] =
>  {
> -       4,    42,   -90,    96,   -90,   111,   -90,    15,   -90,   -90,
> -      75,   -90,    82,    42,   104,    42,   110,   107,    42,   115,
> -     125,    -4,   121,   -90,   -90,   -90,   -90,   -90,   -90,   -90,
> -     -90,   162,   -90,   163,   -90,   -90,   -90,   -90,   -90,   -90,
> -     -90,   -90,   -90,   -90,   -90,   -90,   -90,   -90,   -90,   -90,
> -     -90,   139,   -90,   -90,   138,   -90,   142,   -90,   143,   -90,
> -     152,   -90,   164,   167,   168,   -90,   -90,    -4,    -4,    77,
> -     -18,   -90,   177,   185,    33,    71,   195,   247,   236,    -2,
> -     236,   171,   -90,   -90,   -90,   -90,   -90,   -90,    41,   -90,
> -      -4,    -4,   138,    97,    97,   -90,   -90,   186,   187,   194,
> -      42,    42,    -4,   196,    97,   -90,   219,   -90,   -90,   -90,
> -     -90,   210,   -90,   -90,   204,    42,    42,   199,   -90,   -90,
> -     -90,   -90,   -90,   -90,   -90,   -90,   -90,   -90,   -90,   -90,
> -     -90,   222,   -90,   223,   -90,   -90,   -90,   -90,   -90,   -90,
> -     -90,   -90,   -90,   -90,   215,   -90,   -90,   -90,   -90,   -90,
> -      -4,   222,   228,   222,    -5,   222,    97,    35,   229,   -90,
> -     -90,   222,   232,   222,    -4,   -90,   135,   233,   -90,   -90,
> -     234,   235,   222,   240,   -90,   -90,   237,   -90,   239,   -13,
> -     -90,   -90,   -90,   -90,   244,    42,   -90,   -90,   -90,   -90,
> -     -90
> +      15,   -19,  -105,     6,  -105,   125,  -105,    29,  -105,  -105,
> +      13,  -105,    20,   -19,    22,   -19,    33,    30,   -19,    36,
> +      43,    50,    50,    48,  -105,  -105,  -105,  -105,  -105,  -105,
> +    -105,  -105,    90,  -105,    93,  -105,  -105,  -105,  -105,  -105,
> +    -105,  -105,  -105,  -105,  -105,  -105,  -105,  -105,  -105,  -105,
> +    -105,  -105,  -105,  -105,   154,  -105,  -105,    58,  -105,    63,
> +    -105,    86,  -105,    95,  -105,    96,   106,   118,  -105,  -105,
> +      50,    50,    89,   -24,    89,  -105,   121,   124,    19,    92,
> +     214,   271,   257,   257,    24,   257,   189,  -105,  -105,  -105,
> +    -105,  -105,  -105,    55,  -105,    50,    50,    58,    -6,    -6,
> +      58,  -105,  -105,   134,   135,   162,   -19,   -19,    50,   164,
> +      -6,  -105,   200,  -105,  -105,  -105,  -105,   201,  -105,  -105,
> +     170,   -19,   -19,   190,  -105,  -105,  -105,  -105,  -105,  -105,
> +    -105,  -105,  -105,  -105,  -105,  -105,  -105,  -105,  -105,   204,
> +    -105,   243,  -105,  -105,  -105,  -105,  -105,  -105,  -105,  -105,
> +    -105,  -105,   193,  -105,  -105,  -105,  -105,  -105,    50,   204,
> +     207,   204,    39,   204,    -6,    52,   223,  -105,  -105,   204,
> +     224,   204,    50,  -105,   258,   237,  -105,  -105,   242,   246,
> +     204,   248,  -105,  -105,   252,  -105,   256,    49,  -105,  -105,
> +    -105,  -105,   261,   -19,  -105,  -105,  -105,  -105,  -105
>  };
> 
>    /* YYDEFACT[STATE-NUM] -- Default reduction number in state STATE-NUM.
> @@ -599,46 +602,48 @@ static const yytype_int16 yypact[] =
>       means the default is an error.  */
>  static const yytype_uint8 yydefact[] =
>  {
> -       6,     0,   104,     0,     3,     0,     6,     6,    99,   100,
> -       0,     1,     0,     0,     0,     0,   117,     0,     0,     0,
> -       0,     0,     0,    14,    18,    15,    16,    20,    17,    19,
> -      21,     0,    22,     0,     7,    34,    25,    34,    26,    55,
> -      65,     8,    70,    23,    93,    79,     9,    27,    88,    24,
> -      10,     0,   105,     2,    74,    13,     0,   101,     0,   118,
> -       0,   102,     0,     0,     0,   115,   116,     0,     0,     0,
> -     108,   103,     0,     0,     0,     0,     0,     0,     0,    88,
> -       0,     0,    75,    83,    51,    84,    30,    32,     0,   112,
> -       0,     0,    67,     0,     0,    11,    12,     0,     0,     0,
> -       0,    97,     0,     0,     0,    47,     0,    40,    39,    35,
> -      36,     0,    38,    37,     0,     0,    97,     0,    59,    60,
> -      56,    58,    57,    66,    54,    53,    71,    73,    69,    72,
> -      68,   106,    95,     0,    94,    80,    82,    78,    81,    77,
> -      90,    91,    89,   111,   113,   114,   110,   109,    29,    86,
> -       0,   106,     0,   106,   106,   106,     0,     0,     0,    87,
> -      63,   106,     0,   106,     0,    96,     0,     0,    41,    98,
> -       0,     0,   106,    49,    46,    28,     0,    62,     0,   107,
> -      92,    42,    43,    44,     0,     0,    48,    61,    64,    45,
> -      50
> +       6,     0,   108,     0,     3,     0,     6,     6,   103,   104,
> +       0,     1,     0,     0,     0,     0,   121,     0,     0,     0,
> +       0,     0,     0,     0,    14,    18,    15,    16,    20,    17,
> +      19,    21,     0,    22,     0,     7,    35,    26,    35,    27,
> +      56,    66,     8,    74,    74,    23,    24,    97,    83,     9,
> +      28,    92,    25,    10,     0,   109,     2,    78,    13,     0,
> +     105,     0,   122,     0,   106,     0,     0,     0,   119,   120,
> +       0,     0,     0,   112,     0,   107,     0,     0,     0,     0,
> +       0,     0,     0,     0,    92,     0,     0,    79,    87,    52,
> +      88,    31,    33,     0,   116,     0,     0,    68,     0,     0,
> +      69,    11,    12,     0,     0,     0,     0,   101,     0,     0,
> +       0,    48,     0,    41,    40,    36,    37,     0,    39,    38,
> +       0,     0,   101,     0,    60,    61,    57,    59,    58,    67,
> +      55,    54,    75,    77,    72,    76,    70,    73,    71,   110,
> +      99,     0,    98,    84,    86,    82,    85,    81,    94,    95,
> +      93,   115,   117,   118,   114,   113,    30,    90,     0,   110,
> +       0,   110,   110,   110,     0,     0,     0,    91,    64,   110,
> +       0,   110,     0,   100,     0,     0,    42,   102,     0,     0,
> +     110,    50,    47,    29,     0,    63,     0,   111,    96,    43,
> +      44,    45,     0,     0,    49,    62,    65,    46,    51
>  };
> 
>    /* YYPGOTO[NTERM-NUM].  */
>  static const yytype_int16 yypgoto[] =
>  {
> -     -90,   -90,   269,   271,   -90,    23,   -70,   -90,   -90,   -90,
> -     -90,   243,   -90,   -90,   -90,   -90,   -90,   -90,   -90,   -48,
> -     -90,   -90,   -90,   -90,   -90,   -90,   -90,   -90,   -90,   -90,
> -     -90,   -20,   -90,   -90,   -90,   -90,   -90,   206,   205,   -68,
> -     -90,   -90,   169,    -1,    27,    -7,   118,   -66,   -89,   -90
> +    -105,  -105,   287,   289,  -105,   102,   -73,  -105,  -105,  -105,
> +    -105,   259,  -105,  -105,  -105,  -105,  -105,  -105,  -105,    97,
> +    -105,  -105,  -105,  -105,  -105,  -105,  -105,  -105,  -105,   254,
> +    -105,  -105,  -105,  -105,   160,  -105,  -105,  -105,  -105,  -105,
> +     216,   215,   -70,  -105,  -105,   178,    -1,   155,    -8,  -104,
> +     -21,   -95,  -105
>  };
> 
>    /* YYDEFGOTO[NTERM-NUM].  */
>  static const yytype_int16 yydefgoto[] =
>  {
> -      -1,     3,     4,     5,    33,    34,   108,    35,    36,    37,
> -      38,    74,   109,   110,   157,   186,    39,    40,   124,    41,
> -      76,   120,    77,    42,   128,    43,    78,     6,    44,    45,
> -     137,    46,    80,    47,    48,    49,   111,   112,    81,   113,
> -      79,   134,   152,   153,    50,     7,   165,    69,    70,    60
> +      -1,     3,     4,     5,    34,    35,   114,    36,    37,    38,
> +      39,    78,   115,   116,   165,   194,    40,    41,   130,    42,
> +      80,   126,    81,    43,    44,   134,   137,    45,    46,    82,
> +       6,    47,    48,   145,    49,    85,    50,    51,    52,   117,
> +     118,    86,   119,    84,   142,   160,   161,    53,     7,   173,
> +      72,    73,    63
>  };
> 
>    /* YYTABLE[YYPACT[STATE-NUM]] -- What to do in state STATE-NUM.  If
> @@ -646,113 +651,116 @@ static const yytype_int16 yydefgoto[] =
>       number is the opposite.  If YYTABLE_NINF, syntax error.  */
>  static const yytype_int16 yytable[] =
>  {
> -      10,    88,    89,    54,   146,   147,   119,     1,   122,   164,
> -      93,   141,    56,   142,    58,   156,    94,    62,     1,    90,
> -      91,   131,    65,    66,   144,   145,    67,    90,    91,   132,
> -     127,    68,   136,   -31,    97,     2,   154,   -31,   -31,   -31,
> -     -31,   -31,   -31,   -31,   -31,    98,    52,   -31,   -31,    99,
> -     -31,   100,   101,   102,   103,   104,   -31,   105,   129,   106,
> -     138,   173,    92,   141,   107,   142,   174,   172,     8,     9,
> -     143,   -33,    97,    90,    91,   -33,   -33,   -33,   -33,   -33,
> -     -33,   -33,   -33,    98,   166,   -33,   -33,    99,   -33,   100,
> -     101,   102,   103,   104,   -33,   105,    11,   106,   179,   151,
> -     123,   126,   107,   135,   125,   130,     2,   139,     2,    90,
> -      91,    -5,    12,    55,   161,    13,    14,    15,    16,    17,
> -      18,    19,    20,    65,    66,    21,    22,    23,    24,    25,
> -      26,    27,    28,    29,    30,    57,    59,    31,    61,    -4,
> -      12,    63,    32,    13,    14,    15,    16,    17,    18,    19,
> -      20,    64,    71,    21,    22,    23,    24,    25,    26,    27,
> -      28,    29,    30,    72,    73,    31,   180,    90,    91,    52,
> -      32,   -85,    97,    82,    83,   -85,   -85,   -85,   -85,   -85,
> -     -85,   -85,   -85,    84,   190,   -85,   -85,    99,   -85,   -85,
> -     -85,   -85,   -85,   -85,   -85,    85,    97,   106,    86,    87,
> -     -52,   -52,   140,   -52,   -52,   -52,   -52,    98,    95,   -52,
> -     -52,    99,   114,   115,   116,   117,    96,   148,   149,   150,
> -     158,   106,   155,   159,    97,   163,   118,   -76,   -76,   -76,
> -     -76,   -76,   -76,   -76,   -76,   160,   164,   -76,   -76,    99,
> -      13,    14,    15,    16,    17,    18,    19,    20,    91,   106,
> -      21,    22,    14,    15,   140,    17,    18,    19,    20,   168,
> -     175,    21,    22,   177,   181,   182,   183,    32,   187,   167,
> -     188,   169,   170,   171,   185,   189,    53,    51,    32,   176,
> -      75,   178,   121,     0,   133,   162,     0,     0,     0,     0,
> -     184
> +      10,    74,    57,   154,   155,    98,    11,   125,     8,     9,
> +     128,    99,    59,   149,    61,   164,   150,    65,     1,   -32,
> +     103,    68,    69,   -32,   -32,   -32,   -32,   -32,   -32,   -32,
> +     -32,   104,     1,   -32,   -32,   -32,   105,   -32,   106,   107,
> +     108,   109,   110,   -32,   111,     2,   112,     2,   139,    93,
> +      94,   113,    58,   172,    60,   175,   140,   177,   178,   179,
> +      62,    55,    64,    66,    97,   184,   100,   186,   149,   180,
> +      67,   150,    95,    96,   152,   153,   192,    68,    69,   181,
> +      75,    70,    95,    96,   182,   151,    71,   162,    95,    96,
> +      55,    76,   -34,   103,    77,    87,   -34,   -34,   -34,   -34,
> +     -34,   -34,   -34,   -34,   104,   159,   -34,   -34,   -34,   105,
> +     -34,   106,   107,   108,   109,   110,   -34,   111,    88,   112,
> +     169,     2,    95,    96,   113,    -5,    12,    89,    90,    13,
> +      14,    15,    16,    17,    18,    19,    20,   174,    91,    21,
> +      22,    23,    24,    25,    26,    27,    28,    29,    30,    31,
> +      92,   187,    32,   101,    -4,    12,   102,    33,    13,    14,
> +      15,    16,    17,    18,    19,    20,   156,   157,    21,    22,
> +      23,    24,    25,    26,    27,    28,    29,    30,    31,   133,
> +     133,    32,   144,   129,   132,   132,    33,   143,   158,   -89,
> +     103,   163,   198,   -89,   -89,   -89,   -89,   -89,   -89,   -89,
> +     -89,   166,   168,   -89,   -89,   -89,   105,   -89,   -89,   -89,
> +     -89,   -89,   -89,   -89,   167,   103,   112,   171,   172,   -53,
> +     -53,   148,   -53,   -53,   -53,   -53,   104,    96,   -53,   -53,
> +     -53,   105,   120,   121,   122,   123,   131,   136,   138,   176,
> +     147,   112,   135,   135,   103,   146,   124,   -80,   -80,   -80,
> +     -80,   -80,   -80,   -80,   -80,   183,   185,   -80,   -80,   -80,
> +     105,    13,    14,    15,    16,    17,    18,    19,    20,   189,
> +     112,    21,    22,    23,   190,   148,    14,    15,   191,    17,
> +      18,    19,    20,   193,   195,    21,    22,    23,   196,    33,
> +     188,    95,    96,   197,    56,    54,   127,    79,    83,   141,
> +     170,     0,     0,    33
>  };
> 
>  static const yytype_int16 yycheck[] =
>  {
> -       1,    67,    68,    10,    93,    94,    76,     3,    76,    14,
> -      28,    81,    13,    81,    15,   104,    34,    18,     3,    32,
> -      33,    23,    26,    27,    90,    91,    30,    32,    33,    31,
> -      78,    35,    80,     0,     1,    31,   102,     4,     5,     6,
> -       7,     8,     9,    10,    11,    12,    31,    14,    15,    16,
> -      17,    18,    19,    20,    21,    22,    23,    24,    78,    26,
> -      80,    26,    69,   133,    31,   133,    31,   156,    26,    27,
> -      29,     0,     1,    32,    33,     4,     5,     6,     7,     8,
> -       9,    10,    11,    12,   150,    14,    15,    16,    17,    18,
> -      19,    20,    21,    22,    23,    24,     0,    26,   164,   100,
> -      77,    78,    31,    80,    77,    78,    31,    80,    31,    32,
> -      33,     0,     1,    31,   115,     4,     5,     6,     7,     8,
> -       9,    10,    11,    26,    27,    14,    15,    16,    17,    18,
> -      19,    20,    21,    22,    23,    31,    26,    26,    31,     0,
> -       1,    26,    31,     4,     5,     6,     7,     8,     9,    10,
> -      11,    26,    31,    14,    15,    16,    17,    18,    19,    20,
> -      21,    22,    23,     1,     1,    26,    31,    32,    33,    31,
> -      31,     0,     1,    31,    31,     4,     5,     6,     7,     8,
> -       9,    10,    11,    31,   185,    14,    15,    16,    17,    18,
> -      19,    20,    21,    22,    23,    31,     1,    26,    31,    31,
> -       5,     6,    31,     8,     9,    10,    11,    12,    31,    14,
> -      15,    16,    17,    18,    19,    20,    31,    31,    31,    25,
> -       1,    26,    26,    13,     1,    26,    31,     4,     5,     6,
> -       7,     8,     9,    10,    11,    31,    14,    14,    15,    16,
> -       4,     5,     6,     7,     8,     9,    10,    11,    33,    26,
> -      14,    15,     5,     6,    31,     8,     9,    10,    11,    31,
> -      31,    14,    15,    31,    31,    31,    31,    31,    31,   151,
> -      31,   153,   154,   155,    34,    31,     7,     6,    31,   161,
> -      37,   163,    76,    -1,    79,   116,    -1,    -1,    -1,    -1,
> -     172
> +       1,    22,    10,    98,    99,    29,     0,    80,    27,    28,
> +      80,    35,    13,    86,    15,   110,    86,    18,     3,     0,
> +       1,    27,    28,     4,     5,     6,     7,     8,     9,    10,
> +      11,    12,     3,    14,    15,    16,    17,    18,    19,    20,
> +      21,    22,    23,    24,    25,    32,    27,    32,    24,    70,
> +      71,    32,    32,    14,    32,   159,    32,   161,   162,   163,
> +      27,    32,    32,    27,    72,   169,    74,   171,   141,   164,
> +      27,   141,    33,    34,    95,    96,   180,    27,    28,    27,
> +      32,    31,    33,    34,    32,    30,    36,   108,    33,    34,
> +      32,     1,     0,     1,     1,    32,     4,     5,     6,     7,
> +       8,     9,    10,    11,    12,   106,    14,    15,    16,    17,
> +      18,    19,    20,    21,    22,    23,    24,    25,    32,    27,
> +     121,    32,    33,    34,    32,     0,     1,    32,    32,     4,
> +       5,     6,     7,     8,     9,    10,    11,   158,    32,    14,
> +      15,    16,    17,    18,    19,    20,    21,    22,    23,    24,
> +      32,   172,    27,    32,     0,     1,    32,    32,     4,     5,
> +       6,     7,     8,     9,    10,    11,    32,    32,    14,    15,
> +      16,    17,    18,    19,    20,    21,    22,    23,    24,    82,
> +      83,    27,    85,    81,    82,    83,    32,    85,    26,     0,
> +       1,    27,   193,     4,     5,     6,     7,     8,     9,    10,
> +      11,     1,    32,    14,    15,    16,    17,    18,    19,    20,
> +      21,    22,    23,    24,    13,     1,    27,    27,    14,     5,
> +       6,    32,     8,     9,    10,    11,    12,    34,    14,    15,
> +      16,    17,    18,    19,    20,    21,    81,    82,    83,    32,
> +      85,    27,    82,    83,     1,    85,    32,     4,     5,     6,
> +       7,     8,     9,    10,    11,    32,    32,    14,    15,    16,
> +      17,     4,     5,     6,     7,     8,     9,    10,    11,    32,
> +      27,    14,    15,    16,    32,    32,     5,     6,    32,     8,
> +       9,    10,    11,    35,    32,    14,    15,    16,    32,    32,
> +      32,    33,    34,    32,     7,     6,    80,    38,    44,    84,
> +     122,    -1,    -1,    32
>  };
> 
>    /* YYSTOS[STATE-NUM] -- The (internal number of the) accessing
>       symbol of state STATE-NUM.  */
>  static const yytype_uint8 yystos[] =
>  {
> -       0,     3,    31,    37,    38,    39,    63,    81,    26,    27,
> -      79,     0,     1,     4,     5,     6,     7,     8,     9,    10,
> +       0,     3,    32,    38,    39,    40,    67,    85,    27,    28,
> +      83,     0,     1,     4,     5,     6,     7,     8,     9,    10,
>        11,    14,    15,    16,    17,    18,    19,    20,    21,    22,
> -      23,    26,    31,    40,    41,    43,    44,    45,    46,    52,
> -      53,    55,    59,    61,    64,    65,    67,    69,    70,    71,
> -      80,    39,    31,    38,    81,    31,    79,    31,    79,    26,
> -      85,    31,    79,    26,    26,    26,    27,    30,    35,    83,
> -      84,    31,     1,     1,    47,    47,    56,    58,    62,    76,
> -      68,    74,    31,    31,    31,    31,    31,    31,    83,    83,
> -      32,    33,    81,    28,    34,    31,    31,     1,    12,    16,
> -      18,    19,    20,    21,    22,    24,    26,    31,    42,    48,
> -      49,    72,    73,    75,    17,    18,    19,    20,    31,    42,
> -      57,    73,    75,    41,    54,    80,    41,    55,    60,    67,
> -      80,    23,    31,    74,    77,    41,    55,    66,    67,    80,
> -      31,    42,    75,    29,    83,    83,    84,    84,    31,    31,
> -      25,    79,    78,    79,    83,    26,    84,    50,     1,    13,
> -      31,    79,    78,    26,    14,    82,    83,    82,    31,    82,
> -      82,    82,    84,    26,    31,    31,    82,    31,    82,    83,
> -      31,    31,    31,    31,    82,    34,    51,    31,    31,    31,
> -      79
> +      23,    24,    27,    32,    41,    42,    44,    45,    46,    47,
> +      53,    54,    56,    60,    61,    64,    65,    68,    69,    71,
> +      73,    74,    75,    84,    40,    32,    39,    85,    32,    83,
> +      32,    83,    27,    89,    32,    83,    27,    27,    27,    28,
> +      31,    36,    87,    88,    87,    32,     1,     1,    48,    48,
> +      57,    59,    66,    66,    80,    72,    78,    32,    32,    32,
> +      32,    32,    32,    87,    87,    33,    34,    85,    29,    35,
> +      85,    32,    32,     1,    12,    17,    19,    20,    21,    22,
> +      23,    25,    27,    32,    43,    49,    50,    76,    77,    79,
> +      18,    19,    20,    21,    32,    43,    58,    77,    79,    42,
> +      55,    84,    42,    56,    62,    71,    84,    63,    84,    24,
> +      32,    78,    81,    42,    56,    70,    71,    84,    32,    43,
> +      79,    30,    87,    87,    88,    88,    32,    32,    26,    83,
> +      82,    83,    87,    27,    88,    51,     1,    13,    32,    83,
> +      82,    27,    14,    86,    87,    86,    32,    86,    86,    86,
> +      88,    27,    32,    32,    86,    32,    86,    87,    32,    32,
> +      32,    32,    86,    35,    52,    32,    32,    32,    83
>  };
> 
>    /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
>  static const yytype_uint8 yyr1[] =
>  {
> -       0,    36,    37,    37,    38,    38,    39,    39,    39,    39,
> -      39,    39,    39,    39,    40,    40,    40,    40,    40,    40,
> -      40,    40,    41,    41,    41,    41,    41,    41,    42,    42,
> -      43,    44,    45,    46,    47,    47,    47,    47,    47,    47,
> -      47,    48,    48,    48,    48,    48,    49,    50,    50,    51,
> -      51,    52,    53,    54,    55,    56,    56,    56,    56,    56,
> -      56,    57,    57,    57,    57,    58,    58,    59,    60,    61,
> -      62,    62,    62,    62,    63,    64,    65,    66,    67,    68,
> -      68,    68,    68,    69,    70,    71,    72,    73,    74,    74,
> -      74,    74,    75,    76,    76,    76,    77,    78,    78,    79,
> -      79,    80,    80,    80,    81,    81,    82,    82,    83,    83,
> -      83,    83,    83,    83,    83,    84,    84,    85,    85
> +       0,    37,    38,    38,    39,    39,    40,    40,    40,    40,
> +      40,    40,    40,    40,    41,    41,    41,    41,    41,    41,
> +      41,    41,    42,    42,    42,    42,    42,    42,    42,    43,
> +      43,    44,    45,    46,    47,    48,    48,    48,    48,    48,
> +      48,    48,    49,    49,    49,    49,    49,    50,    51,    51,
> +      52,    52,    53,    54,    55,    56,    57,    57,    57,    57,
> +      57,    57,    58,    58,    58,    58,    59,    59,    60,    61,
> +      62,    63,    64,    65,    66,    66,    66,    66,    67,    68,
> +      69,    70,    71,    72,    72,    72,    72,    73,    74,    75,
> +      76,    77,    78,    78,    78,    78,    79,    80,    80,    80,
> +      81,    82,    82,    83,    83,    84,    84,    84,    85,    85,
> +      86,    86,    87,    87,    87,    87,    87,    87,    87,    88,
> +      88,    89,    89
>  };
> 
>    /* YYR2[YYN] -- Number of symbols on the right hand side of rule YYN.  */
> @@ -760,16 +768,17 @@ static const yytype_uint8 yyr2[] =
>  {
>         0,     2,     2,     1,     2,     1,     0,     2,     2,     2,
>         2,     4,     4,     3,     1,     1,     1,     1,     1,     1,
> -       1,     1,     1,     1,     1,     1,     1,     1,     3,     2,
> -       3,     2,     3,     2,     0,     2,     2,     2,     2,     2,
> -       2,     3,     4,     4,     4,     5,     3,     0,     3,     0,
> -       2,     3,     2,     1,     3,     0,     2,     2,     2,     2,
> -       2,     4,     3,     2,     4,     0,     2,     3,     1,     3,
> -       0,     2,     2,     2,     3,     3,     3,     1,     3,     0,
> -       2,     2,     2,     3,     3,     2,     2,     2,     0,     2,
> -       2,     2,     4,     0,     2,     2,     2,     0,     2,     1,
> -       1,     2,     2,     2,     1,     2,     0,     2,     1,     3,
> -       3,     3,     2,     3,     3,     1,     1,     0,     1
> +       1,     1,     1,     1,     1,     1,     1,     1,     1,     3,
> +       2,     3,     2,     3,     2,     0,     2,     2,     2,     2,
> +       2,     2,     3,     4,     4,     4,     5,     3,     0,     3,
> +       0,     2,     3,     2,     1,     3,     0,     2,     2,     2,
> +       2,     2,     4,     3,     2,     4,     0,     2,     3,     3,
> +       1,     1,     3,     3,     0,     2,     2,     2,     3,     3,
> +       3,     1,     3,     0,     2,     2,     2,     3,     3,     2,
> +       2,     2,     0,     2,     2,     2,     4,     0,     2,     2,
> +       2,     0,     2,     1,     1,     2,     2,     2,     1,     2,
> +       0,     2,     1,     3,     3,     3,     2,     3,     3,     1,
> +       1,     0,     1
>  };
> 
> 
> @@ -1192,7 +1201,18 @@ yydestruct (const char *yymsg, int yytype, YYSTYPE *yyvaluep)
>    YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
>    switch (yytype)
>      {
> -          case 53: /* choice_entry  */
> +          case 54: /* choice_entry  */
> +
> +      {
> +	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
> +		((*yyvaluep).menu)->file->name, ((*yyvaluep).menu)->lineno);
> +	if (current_menu == ((*yyvaluep).menu))
> +		menu_end_menu();
> +}
> +
> +        break;
> +
> +    case 60: /* if_entry  */
> 
>        {
>  	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
> @@ -1203,7 +1223,7 @@ yydestruct (const char *yymsg, int yytype, YYSTYPE *yyvaluep)
> 
>          break;
> 
> -    case 59: /* if_entry  */
> +    case 61: /* showif_entry  */
> 
>        {
>  	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
> @@ -1214,7 +1234,7 @@ yydestruct (const char *yymsg, int yytype, YYSTYPE *yyvaluep)
> 
>          break;
> 
> -    case 65: /* menu_entry  */
> +    case 69: /* menu_entry  */
> 
>        {
>  	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
> @@ -1509,19 +1529,19 @@ yyreduce:
> 
>      break;
> 
> -  case 28:
> +  case 29:
> 
>      { zconf_error("unknown option \"%s\"", (yyvsp[-2].string)); }
> 
>      break;
> 
> -  case 29:
> +  case 30:
> 
>      { zconf_error("invalid option"); }
> 
>      break;
> 
> -  case 30:
> +  case 31:
> 
>      {
>  	struct symbol *sym = sym_lookup((yyvsp[-1].string), 0);
> @@ -1532,7 +1552,7 @@ yyreduce:
> 
>      break;
> 
> -  case 31:
> +  case 32:
> 
>      {
>  	menu_end_entry();
> @@ -1541,7 +1561,7 @@ yyreduce:
> 
>      break;
> 
> -  case 32:
> +  case 33:
> 
>      {
>  	struct symbol *sym = sym_lookup((yyvsp[-1].string), 0);
> @@ -1552,7 +1572,7 @@ yyreduce:
> 
>      break;
> 
> -  case 33:
> +  case 34:
> 
>      {
>  	if (current_entry->prompt)
> @@ -1565,7 +1585,7 @@ yyreduce:
> 
>      break;
> 
> -  case 41:
> +  case 42:
> 
>      {
>  	menu_set_type((yyvsp[-2].id)->stype);
> @@ -1576,7 +1596,7 @@ yyreduce:
> 
>      break;
> 
> -  case 42:
> +  case 43:
> 
>      {
>  	menu_add_prompt(P_PROMPT, (yyvsp[-2].string), (yyvsp[-1].expr));
> @@ -1585,7 +1605,7 @@ yyreduce:
> 
>      break;
> 
> -  case 43:
> +  case 44:
> 
>      {
>  	menu_add_expr(P_DEFAULT, (yyvsp[-2].expr), (yyvsp[-1].expr));
> @@ -1598,7 +1618,7 @@ yyreduce:
> 
>      break;
> 
> -  case 44:
> +  case 45:
> 
>      {
>  	menu_add_symbol(P_SELECT, sym_lookup((yyvsp[-2].string), 0), (yyvsp[-1].expr));
> @@ -1607,7 +1627,7 @@ yyreduce:
> 
>      break;
> 
> -  case 45:
> +  case 46:
> 
>      {
>  	menu_add_expr(P_RANGE, expr_alloc_comp(E_RANGE,(yyvsp[-3].symbol), (yyvsp[-2].symbol)), (yyvsp[-1].expr));
> @@ -1616,7 +1636,7 @@ yyreduce:
> 
>      break;
> 
> -  case 48:
> +  case 49:
> 
>      {
>  	const struct kconf_id *id = kconf_id_lookup((yyvsp[-1].string), strlen((yyvsp[-1].string)));
> @@ -1629,19 +1649,19 @@ yyreduce:
> 
>      break;
> 
> -  case 49:
> +  case 50:
> 
>      { (yyval.string) = NULL; }
> 
>      break;
> 
> -  case 50:
> +  case 51:
> 
>      { (yyval.string) = (yyvsp[0].string); }
> 
>      break;
> 
> -  case 51:
> +  case 52:
> 
>      {
>  	struct symbol *sym = sym_lookup((yyvsp[-1].string), SYMBOL_CHOICE);
> @@ -1653,7 +1673,7 @@ yyreduce:
> 
>      break;
> 
> -  case 52:
> +  case 53:
> 
>      {
>  	(yyval.menu) = menu_add_menu();
> @@ -1661,7 +1681,7 @@ yyreduce:
> 
>      break;
> 
> -  case 53:
> +  case 54:
> 
>      {
>  	if (zconf_endtoken((yyvsp[0].id), T_CHOICE, T_ENDCHOICE)) {
> @@ -1672,7 +1692,7 @@ yyreduce:
> 
>      break;
> 
> -  case 61:
> +  case 62:
> 
>      {
>  	menu_add_prompt(P_PROMPT, (yyvsp[-2].string), (yyvsp[-1].expr));
> @@ -1681,7 +1701,7 @@ yyreduce:
> 
>      break;
> 
> -  case 62:
> +  case 63:
> 
>      {
>  	if ((yyvsp[-2].id)->stype == S_BOOLEAN || (yyvsp[-2].id)->stype == S_TRISTATE) {
> @@ -1695,7 +1715,7 @@ yyreduce:
> 
>      break;
> 
> -  case 63:
> +  case 64:
> 
>      {
>  	current_entry->sym->flags |= SYMBOL_OPTIONAL;
> @@ -1704,7 +1724,7 @@ yyreduce:
> 
>      break;
> 
> -  case 64:
> +  case 65:
> 
>      {
>  	if ((yyvsp[-3].id)->stype == S_UNKNOWN) {
> @@ -1717,7 +1737,7 @@ yyreduce:
> 
>      break;
> 
> -  case 67:
> +  case 68:
> 
>      {
>  	printd(DEBUG_PARSE, "%s:%d:if\n", zconf_curname(), zconf_lineno());
> @@ -1728,7 +1748,18 @@ yyreduce:
> 
>      break;
> 
> -  case 68:
> +  case 69:
> +
> +    {
> +	printd(DEBUG_PARSE, "%s:%d:showif\n", zconf_curname(), zconf_lineno());
> +	menu_add_entry(NULL);
> +	menu_add_visibility((yyvsp[-1].expr));
> +	(yyval.menu) = menu_add_menu();
> +}
> +
> +    break;
> +
> +  case 70:
> 
>      {
>  	if (zconf_endtoken((yyvsp[0].id), T_IF, T_ENDIF)) {
> @@ -1739,7 +1770,18 @@ yyreduce:
> 
>      break;
> 
> -  case 74:
> +  case 71:
> +
> +    {
> +	if (zconf_endtoken((yyvsp[0].id), T_SHOWIF, T_ENDIF)) {
> +		menu_end_menu();
> +		printd(DEBUG_PARSE, "%s:%d:endif\n", zconf_curname(), zconf_lineno());
> +	}
> +}
> +
> +    break;
> +
> +  case 78:
> 
>      {
>  	menu_add_prompt(P_MENU, (yyvsp[-1].string), NULL);
> @@ -1747,7 +1789,7 @@ yyreduce:
> 
>      break;
> 
> -  case 75:
> +  case 79:
> 
>      {
>  	menu_add_entry(NULL);
> @@ -1757,7 +1799,7 @@ yyreduce:
> 
>      break;
> 
> -  case 76:
> +  case 80:
> 
>      {
>  	(yyval.menu) = menu_add_menu();
> @@ -1765,7 +1807,7 @@ yyreduce:
> 
>      break;
> 
> -  case 77:
> +  case 81:
> 
>      {
>  	if (zconf_endtoken((yyvsp[0].id), T_MENU, T_ENDMENU)) {
> @@ -1776,7 +1818,7 @@ yyreduce:
> 
>      break;
> 
> -  case 83:
> +  case 87:
> 
>      {
>  	printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), zconf_lineno(), (yyvsp[-1].string));
> @@ -1785,7 +1827,7 @@ yyreduce:
> 
>      break;
> 
> -  case 84:
> +  case 88:
> 
>      {
>  	menu_add_entry(NULL);
> @@ -1795,7 +1837,7 @@ yyreduce:
> 
>      break;
> 
> -  case 85:
> +  case 89:
> 
>      {
>  	menu_end_entry();
> @@ -1803,7 +1845,7 @@ yyreduce:
> 
>      break;
> 
> -  case 86:
> +  case 90:
> 
>      {
>  	printd(DEBUG_PARSE, "%s:%d:help\n", zconf_curname(), zconf_lineno());
> @@ -1812,7 +1854,7 @@ yyreduce:
> 
>      break;
> 
> -  case 87:
> +  case 91:
> 
>      {
>  	current_entry->help = (yyvsp[0].string);
> @@ -1820,7 +1862,7 @@ yyreduce:
> 
>      break;
> 
> -  case 92:
> +  case 96:
> 
>      {
>  	menu_add_dep((yyvsp[-1].expr));
> @@ -1829,7 +1871,7 @@ yyreduce:
> 
>      break;
> 
> -  case 96:
> +  case 100:
> 
>      {
>  	menu_add_visibility((yyvsp[0].expr));
> @@ -1837,7 +1879,7 @@ yyreduce:
> 
>      break;
> 
> -  case 98:
> +  case 102:
> 
>      {
>  	menu_add_prompt(P_PROMPT, (yyvsp[-1].string), (yyvsp[0].expr));
> @@ -1845,91 +1887,91 @@ yyreduce:
> 
>      break;
> 
> -  case 101:
> +  case 105:
> 
>      { (yyval.id) = (yyvsp[-1].id); }
> 
>      break;
> 
> -  case 102:
> +  case 106:
> 
>      { (yyval.id) = (yyvsp[-1].id); }
> 
>      break;
> 
> -  case 103:
> +  case 107:
> 
>      { (yyval.id) = (yyvsp[-1].id); }
> 
>      break;
> 
> -  case 106:
> +  case 110:
> 
>      { (yyval.expr) = NULL; }
> 
>      break;
> 
> -  case 107:
> +  case 111:
> 
>      { (yyval.expr) = (yyvsp[0].expr); }
> 
>      break;
> 
> -  case 108:
> +  case 112:
> 
>      { (yyval.expr) = expr_alloc_symbol((yyvsp[0].symbol)); }
> 
>      break;
> 
> -  case 109:
> +  case 113:
> 
>      { (yyval.expr) = expr_alloc_comp(E_EQUAL, (yyvsp[-2].symbol), (yyvsp[0].symbol)); }
> 
>      break;
> 
> -  case 110:
> +  case 114:
> 
>      { (yyval.expr) = expr_alloc_comp(E_UNEQUAL, (yyvsp[-2].symbol), (yyvsp[0].symbol)); }
> 
>      break;
> 
> -  case 111:
> +  case 115:
> 
>      { (yyval.expr) = (yyvsp[-1].expr); }
> 
>      break;
> 
> -  case 112:
> +  case 116:
> 
>      { (yyval.expr) = expr_alloc_one(E_NOT, (yyvsp[0].expr)); }
> 
>      break;
> 
> -  case 113:
> +  case 117:
> 
>      { (yyval.expr) = expr_alloc_two(E_OR, (yyvsp[-2].expr), (yyvsp[0].expr)); }
> 
>      break;
> 
> -  case 114:
> +  case 118:
> 
>      { (yyval.expr) = expr_alloc_two(E_AND, (yyvsp[-2].expr), (yyvsp[0].expr)); }
> 
>      break;
> 
> -  case 115:
> +  case 119:
> 
>      { (yyval.symbol) = sym_lookup((yyvsp[0].string), 0); free((yyvsp[0].string)); }
> 
>      break;
> 
> -  case 116:
> +  case 120:
> 
>      { (yyval.symbol) = sym_lookup((yyvsp[0].string), SYMBOL_CONST); free((yyvsp[0].string)); }
> 
>      break;
> 
> -  case 117:
> +  case 121:
> 
>      { (yyval.string) = NULL; }
> 
> @@ -2207,6 +2249,7 @@ static const char *zconf_tokenname(int token)
>  	case T_CHOICE:		return "choice";
>  	case T_ENDCHOICE:	return "endchoice";
>  	case T_IF:		return "if";
> +	case T_SHOWIF:		return "showif";
>  	case T_ENDIF:		return "endif";
>  	case T_DEPENDS:		return "depends";
>  	case T_VISIBLE:		return "visible";
> diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y
> index 0f683cf..bb314bd 100644
> --- a/scripts/kconfig/zconf.y
> +++ b/scripts/kconfig/zconf.y
> @@ -31,7 +31,7 @@ struct symbol *symbol_hash[SYMBOL_HASHSIZE];
>  static struct menu *current_menu, *current_entry;
> 
>  %}
> -%expect 30
> +%expect 31
> 
>  %union
>  {
> @@ -55,6 +55,7 @@ static struct menu *current_menu, *current_entry;
>  %token <id>T_HELP
>  %token <string> T_HELPTEXT
>  %token <id>T_IF
> +%token <id>T_SHOWIF
>  %token <id>T_ENDIF
>  %token <id>T_DEPENDS
>  %token <id>T_OPTIONAL
> @@ -84,7 +85,7 @@ static struct menu *current_menu, *current_entry;
>  %type <expr> if_expr
>  %type <id> end
>  %type <id> option_name
> -%type <menu> if_entry menu_entry choice_entry
> +%type <menu> if_entry showif_entry menu_entry choice_entry
>  %type <string> symbol_option_arg word_opt
> 
>  %destructor {
> @@ -92,7 +93,7 @@ static struct menu *current_menu, *current_entry;
>  		$$->file->name, $$->lineno);
>  	if (current_menu == $$)
>  		menu_end_menu();
> -} if_entry menu_entry choice_entry
> +} if_entry showif_entry menu_entry choice_entry
> 
>  %{
>  /* Include zconf.hash.c here so it can see the token constants. */
> @@ -125,6 +126,7 @@ option_name:
>  common_stmt:
>  	  T_EOL
>  	| if_stmt
> +	| showif_stmt
>  	| comment_stmt
>  	| config_stmt
>  	| menuconfig_stmt
> @@ -321,6 +323,14 @@ if_entry: T_IF expr nl
>  	$$ = menu_add_menu();
>  };
> 
> +showif_entry: T_SHOWIF expr nl
> +{
> +	printd(DEBUG_PARSE, "%s:%d:showif\n", zconf_curname(), zconf_lineno());
> +	menu_add_entry(NULL);
> +	menu_add_visibility($2);
> +	$$ = menu_add_menu();
> +};
> +
>  if_end: end
>  {
>  	if (zconf_endtoken($1, T_IF, T_ENDIF)) {
> @@ -329,9 +339,20 @@ if_end: end
>  	}
>  };
> 
> +showif_end: end
> +{
> +	if (zconf_endtoken($1, T_SHOWIF, T_ENDIF)) {
> +		menu_end_menu();
> +		printd(DEBUG_PARSE, "%s:%d:endif\n", zconf_curname(), zconf_lineno());
> +	}
> +};
> +
>  if_stmt: if_entry if_block if_end
>  ;
> 
> +showif_stmt: showif_entry if_block showif_end
> +;
> +
>  if_block:
>  	  /* empty */
>  	| if_block common_stmt
> @@ -524,6 +545,7 @@ static const char *zconf_tokenname(int token)
>  	case T_CHOICE:		return "choice";
>  	case T_ENDCHOICE:	return "endchoice";
>  	case T_IF:		return "if";
> +	case T_SHOWIF:		return "showif";
>  	case T_ENDIF:		return "endif";
>  	case T_DEPENDS:		return "depends";
>  	case T_VISIBLE:		return "visible";
> -- 
> 2.1.4
> 

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