Masahiro Yamada 8b59cd81dc kbuild: ensure full rebuild when the compiler is updated ... Commit 21c54b7747 ("kconfig: show compiler version text in the top comment") added the environment variable, CC_VERSION_TEXT in the comment of the top Kconfig file. It can detect the compiler update, and invoke the syncconfig because all environment variables referenced in Kconfig files are recorded in include/config/auto.conf.cmd This commit makes it a CONFIG option in order to ensure the full rebuild when the compiler is updated. This works like follows: include/config/kconfig.h contains "CONFIG_CC_VERSION_TEXT" in the comment block. The top Makefile specifies "-include $(srctree)/include/linux/kconfig.h" to guarantee it is included from all kernel source files. fixdep parses every source file and all headers included from it, searching for words prefixed with "CONFIG_". Then, fixdep finds CONFIG_CC_VERSION_TEXT in include/config/kconfig.h and adds include/config/cc/version/text.h into every .*.cmd file. When the compiler is updated, syncconfig is invoked because init/Kconfig contains the reference to the environment variable CC_VERTION_TEXT. CONFIG_CC_VERSION_TEXT is updated to the new version string, and include/config/cc/version/text.h is touched. In the next rebuild, Make will rebuild every files since the timestamp of include/config/cc/version/text.h is newer than that of target. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>		2020-05-12 13:28:33 +09:00
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Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
Makefile	kbuild: do not pass $(KBUILD_CFLAGS) to scripts/mkcompile_h	2020-04-09 00:13:45 +09:00
calibrate.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
do_mounts.c	block: remove __bdevname	2020-03-24 07:57:07 -06:00
do_mounts.h	fs: add do_mknodat() helper and ksys_mknod() wrapper; remove in-kernel calls to syscall	2018-04-02 20:15:56 +02:00
do_mounts_initrd.c	init: unify opening /dev/console as stdin/stdout/stderr	2019-12-12 18:58:24 +01:00
do_mounts_md.c	init/: remove ineffective sparse disabling	2018-08-22 10:52:49 -07:00
do_mounts_rd.c	init/: remove ineffective sparse disabling	2018-08-22 10:52:49 -07:00
init_task.c	exec: Add exec_update_mutex to replace cred_guard_mutex	2020-03-25 10:03:36 -05:00
initramfs.c	gcc-10: mark more functions __init to avoid section mismatch warnings	2020-05-09 17:50:03 -07:00
main.c	bootconfig: Fix to remove bootconfig data from initrd while boot	2020-05-06 09:04:11 -04:00
noinitramfs.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 167	2019-05-30 11:26:39 -07:00
version.c	treewide: Add SPDX license identifier for missed files	2019-05-21 10:50:45 +02:00