[Xen-devel] [PATCH RFC] xen/Kconfig: Use olddefconfig not silentoldconfig to update .config

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

RFC RFC RFC RFC RFC RFC RFC RFC RFC RFC RFC
BECAUSE THIS BREAKS CLEAN BUILDS WITH:
In file included from <command-line>:0:0:
/local/scratch/ianc/devel/arm/xen.git/xen/include/xen/config.h:10:32: fatal 
error: generated/autoconf.h: No such file or directory
 #include <generated/autoconf.h>

I'm not sure why given the descriptions of olddefconfig and
silentoldconfig below.

DO NOT APPLY (OF COURSE!)

RFC RFC RFC RFC RFC RFC RFC RFC RFC RFC RFC

When pulling my git tree over a commit which adds new Kconfig
questions the incremental build still stops and asks me the new
questions:

+ make -C xen XEN_TARGET_ARCH=arm64 DESTDIR=/tmp/tmprg7d63   debug=y 
CROSS_COMPILE=aarch64-linux-gnu- -j12 CONFIG_EARLY_PRINTK=fastmodel install
make: Entering directory '/local/scratch/ianc/devel/arm/xen.git/xen'
make -f 
/local/scratch/ianc/devel/arm/xen.git/xen/tools/kconfig/Makefile.kconfig 
ARCH=arm64 silentoldconfig
make[1]: Entering directory '/local/scratch/ianc/devel/arm/xen.git/xen'
gcc -Wp,-MD,tools/kconfig/.conf.o.d    -I/usr/include/ncursesw 
-DCURSES_LOC="<ncurses.h>" -DNCURSES_WIDECHAR=1 -DLOCALE   -c -o 
tools/kconfig/conf.o tools/kconfig/conf.c
gcc -Wp,-MD,tools/kconfig/.zconf.tab.o.d    -I/usr/include/ncursesw 
-DCURSES_LOC="<ncurses.h>" -DNCURSES_WIDECHAR=1 -DLOCALE -Itools/kconfig -c -o 
tools/kconfig/zconf.tab.o tools/kconfig/zconf.tab.c
gcc  -o tools/kconfig/conf tools/kconfig/conf.o tools/kconfig/zconf.tab.o
tools/kconfig/conf -s --silentoldconfig Kconfig
*
* Restart config...
*
*
* Architecture Features
*
Maximum number of physical CPUs (NR_CPUS) [128] (NEW)

This is in contrast to a fully clean build which just gets on with
using the defconfig. According to "make -C xen/tools/kconfig/ help" it seems
like we want olddefconfig rather than silentoldconfig:

  oldconfig       - Update current config utilising a provided .config as base
[...]
  silentoldconfig - Same as oldconfig, but quietly, additionally update deps
[...]
  olddefconfig    - Same as silentoldconfig but sets new symbols to their
                    default value

With this changed it now doesn't ask me any questions on an incremental build
when a new question is added.

Note however that AFAICT in no case would this pickup a change to the default
of an existing option (how could it know?). I think we can live with this.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Doug Goldstein <cardoe@xxxxxxxxxx>
---
 xen/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/Makefile b/xen/Makefile
index 3699b20..f8f3bb4 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -239,7 +239,7 @@ $(kconfig):
        $(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig 
ARCH=$(XEN_TARGET_ARCH) $@
 
 include/config/%.conf: include/config/auto.conf.cmd $(KCONFIG_CONFIG)
-       $(Q)$(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig 
ARCH=$(XEN_TARGET_ARCH) silentoldconfig
+       $(Q)$(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig 
ARCH=$(XEN_TARGET_ARCH) olddefconfig
 
 # Allow people to just run `make` as before and not force them to configure
 $(KCONFIG_CONFIG):
-- 
2.1.4


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