On 07/08/18 12:41, Masahiro Yamada wrote: > 2018-07-08 17:09 GMT+09:00 Bernd Edlinger <bernd.edlinger@xxxxxxxxxx>: >> On 07/08/18 08:31, Bernd Edlinger wrote: >>> The next make after an oldconfig reads in the outdated >>> include/config/auto.conf which can kill the make before >>> it is able to call the syncconfig target. >>> >>> $ make defconfig >>> *** Default configuration is based on 'x86_64_defconfig' >>> $ make >>> scripts/kconfig/conf --syncconfig Kconfig >>> Makefile:936: *** "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, >>> please install libelf-dev, libelf-devel or elfutils-libelf-devel". Stop. >>> >>> $ sed -i s/CONFIG_UNWINDER_ORC=y// .configs >>> $ make oldconfig >>> Choose kernel unwinder >>>> 1. ORC unwinder (UNWINDER_ORC) (NEW) >>> 2. Frame pointer unwinder (UNWINDER_FRAME_POINTER) >>> choice[1-2?]: 2 >>> $ make >>> Makefile:936: *** "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, >>> please install libelf-dev, libelf-devel or elfutils-libelf-devel". Stop. >>> >>> With this patch oldconfig and similar targets like >>> menuconfig call syncconfig to avoid this failure. >>> >>> Signed-off-by: Bernd Edlinger <bernd.edlinger@xxxxxxxxxx> >>> --- >>> scripts/kconfig/Makefile | 1 + >>> 1 file changed, 1 insertion(+) >>> >>> diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile >>> index a3ac2c9..ef34275 100644 >>> --- a/scripts/kconfig/Makefile >>> +++ b/scripts/kconfig/Makefile >>> @@ -62,6 +62,7 @@ PHONY += $(simple-targets) >>> >>> $(simple-targets): $(obj)/conf >>> $< $(silent) --$@ $(Kconfig) >>> + $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig >> >> On second thought, removing the auto.conf might be sufficient: >> $(Q)rm -f include/config/auto.conf include/config/auto.conf.cmd >> >> Would you prefer that? > > No. > > My suggestion is this: > https://patchwork.kernel.org/patch/10513065/ > > Ok, thanks a lot. I tried your patch and it seems reasonable me. (nit: In the change log entry s/RETPORINE/RETPOLINE/) However the warning is gone as well, which was probably done on purpose to push people to install the elf library. I wonder in general if the test using HOSTCC misses somehow the possibility that there may be a CROSS_COMPLILE ? Bernd. ��.n��������+%������w��{.n�����{��F���{ay� ʇڙ���f���h������_�(�階�ݢj"��������G����?���&��
