Messages in this thread | ![/](/images/icornerl.gif) | | From | Qian Cai <> | Subject | include/config/auto.conf not sync up with .config | Date | Sun, 16 Dec 2018 22:56:33 -0500 |
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This bug can be reproduced this way on x86_64.
* make sure none of libelf-dev, libelf-devel or elfutils-libelf-devel installed.
# make distclean
* generate a default .config where CONFIG_UNWINDER_ORC is enabled by default. # make menuconfig (exit -> save)
# grep CONFIG_UNWINDER_ORC .config CONFIG_UNWINDER_ORC=y
# make menuconfig (unselect CONFIG_UNWINDER_ORC)
# grep CONFIG_UNWINDER_ORC .config # CONFIG_UNWINDER_ORC is not set
# make Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel
# grep CONFIG_UNWINDER_ORC include/config/auto.conf CONFIG_UNWINDER_ORC=y
This is due to this receipe in Makefile had never been executed even though .config has is more recent than auto.conf.
# The actual configuration files used during the build are # stored in include/generated/ and include/config/. Update # them if .config is newer than include/config/auto.conf #(which mirrors .config). include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
Actually, replaced that rule with any rule would never executed the recipe there, For example,
/tmp/noexist: $(warning "never print anything")
| ![\](/images/icornerr.gif) |