[PATCH 1/2] kconfig: Add make olddefconfig

[John Stultz <john.stultz@linaro.org>]

This adds an "olddefconfig" build target, which updates a .config file
filling any any absent symbols with the Kconfig default value (note:
not the architecture defconfig value).

Similar to oldnoconfig, this option is useful for build systems
when dealing with config fragments.

CC: gthelen@google.com
CC: tartler@cs.fau.de
CC: Dmitry Fink <Dmitry.Fink@palm.com>
CC: Darren Hart <dvhart@linux.intel.com>
CC: Eric B Munson <ebmunson@us.ibm.com>
CC: Bruce Ashfield <Bruce.Ashfield@windriver.com>
CC: Michal Marek <mmarek@suse.cz>
CC: linux-kbuild@vger.kernel.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
 scripts/kconfig/Makefile |    2 +-
 scripts/kconfig/conf.c   |    4 ++++
 2 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index 82d2eb2..c238f3e 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -103,7 +103,7 @@ allnoconfig allyesconfig allmodconfig alldefconfig randconfig: $(obj)/conf
 
 PHONY += listnewconfig oldnoconfig savedefconfig defconfig
 
-listnewconfig oldnoconfig: $(obj)/conf
+listnewconfig oldnoconfig olddefconfig: $(obj)/conf
 	$< --$@ $(Kconfig)
 
 savedefconfig: $(obj)/conf
diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index f208f90..ab7bc68 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -33,6 +33,7 @@ enum input_mode {
 	savedefconfig,
 	listnewconfig,
 	oldnoconfig,
+	olddefconfig,
 } input_mode = oldaskconfig;
 
 static int indent = 1;
@@ -455,6 +456,7 @@ static struct option long_opts[] = {
 	{"randconfig",      no_argument,       NULL, randconfig},
 	{"listnewconfig",   no_argument,       NULL, listnewconfig},
 	{"oldnoconfig",     no_argument,       NULL, oldnoconfig},
+	{"olddefconfig",    no_argument,       NULL, olddefconfig},
 	{NULL, 0, NULL, 0}
 };
 
@@ -566,6 +568,7 @@ int main(int ac, char **av)
 	case oldconfig:
 	case listnewconfig:
 	case oldnoconfig:
+	case olddefconfig:
 		conf_read(NULL);
 		break;
 	case allnoconfig:
@@ -624,6 +627,7 @@ int main(int ac, char **av)
 		conf_set_all_new_symbols(def_random);
 		break;
 	case defconfig:
+	case olddefconfig:
 		conf_set_all_new_symbols(def_default);
 		break;
 	case savedefconfig:
-- 
1.7.3.2.146.gca209