On 28 July 2015 at 03:00, <rongqing...@windriver.com> wrote: > +config.mk will be included only if auto.conf is newer than .config > +but in some system, the HPET is not enabled, the smallest unit of > +time is second, and can not decise which file is newer, even if > +the correct dependency has been created. > + > +The below shows unit of time: > + > +under SUSE Linux Enterprise Desktop 11 SP2 (i586): > + $ls --full-time include/config/auto.conf .config > + 2015-07-27 03:46:20.000000000 -0400 .config > + 2015-07-27 03:46:20.000000000 -0400 include/config/auto.conf > + $ > + > +under Ubuntu 14.04 LTS: > + $ ls --full-time include/config/auto.conf .config > + 2015-07-27 13:40:14.008703027 +0800 .config > + 2015-07-27 13:40:15.020703054 +0800 include/config/auto.conf > + $ > + > +The rule of including config.mk in Makefile as below > + autoconf_is_current := $(if $(wildcard $(KCONFIG_CONFIG)),$(shell > find . \ > + -path ./include/config/auto.conf -newer > $(KCONFIG_CONFIG))) > + ifneq ($(autoconf_is_current),) > + include $(srctree)/config.mk > + include $(srctree)/arch/$(ARCH)/Makefile > + endif > + > +The compilation will be failed if config.mk is not included > +so delay 1 second to create auto.conf after creating of .config >
Adding a sleep seems pretty ugly, wouldn't a neater fix be to change the logic so that instead of the test being "is newer" you use "is not older", to handle identical timestamps as being current. Ross
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