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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

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 <>
Masahiro Yamada 1 year ago
3 changed files with 19 additions and 2 deletions
  1. +0
  2. +2
  3. +17

+ 0
- 2
Kconfig View File

@ -5,8 +5,6 @@
mainmenu "Linux/$(ARCH) $(KERNELVERSION) Kernel Configuration"
comment "Compiler: $(CC_VERSION_TEXT)"
source "scripts/Kconfig.include"
source "init/Kconfig"

+ 2
- 0
include/linux/kconfig.h View File

@ -2,6 +2,8 @@
/* CONFIG_CC_VERSION_TEXT (Do not delete this comment. See help in Kconfig) */
#include <generated/autoconf.h>

+ 17
- 0
init/Kconfig View File

@ -8,6 +8,23 @@ config DEFCONFIG_LIST
default "/boot/config-$(shell,uname -r)"
default "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)"
default "$(CC_VERSION_TEXT)"
This is used in unclear ways:
- Re-run Kconfig when the compiler is updated
The 'default' property references the environment variable,
CC_VERSION_TEXT so it is recorded in include/config/auto.conf.cmd.
When the compiler is updated, Kconfig will be invoked.
- Ensure full rebuild when the compier is updated
include/linux/kconfig.h contains this option in the comment line so
fixdep adds include/config/cc/version/text.h into the auto-generated
dependency. When the compiler is updated, syncconfig will touch it
and then every file will be rebuilt.
config CC_IS_GCC
def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q gcc)