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Subject[PATCH v4 21/31] kconfig: show compiler version text in the top comment
The kernel configuration phase is now tightly coupled with the compiler
in use. It will be nice to show the compiler information in Kconfig.

The compiler information will be displayed like this:

$ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- config
scripts/kconfig/conf --oldaskconfig Kconfig
* Linux/arm64 4.16.0-rc1 Kernel Configuration
* Compiler: aarch64-linux-gnu-gcc (Linaro GCC 7.2-2017.11) 7.2.1 20171011
* General setup
Compile also drivers which will not load (COMPILE_TEST) [N/y/?]

If you use GUI methods such as menuconfig, it will be displayed in the
top menu.

This is simply implemented by using the 'comment' statement. So, it
will be saved into the .config file as well.

This commit has a very important meaning. If the compiler is upgraded,
Kconfig must be re-run since different compilers have different sets
of supported options.

All referenced environments are written to include/config/auto.conf.cmd
so that any environment change triggers syncconfig, and prompt the user
to input new values if needed.

With this commit, something like follows will be added to

ifneq "$(CC_VERSION_TEXT)" "aarch64-linux-gnu-gcc (Linaro GCC 7.2-2017.11) 7.2.1 20171011"
include/config/auto.conf: FORCE

Signed-off-by: Masahiro Yamada <>
Reviewed-by: Kees Cook <>

Changes in v4:
- Add comment to arch/x86/um/Kconfig as well

Changes in v3: None
Changes in v2: None

Kconfig | 2 ++
Makefile | 2 ++
arch/x86/um/Kconfig | 2 ++
3 files changed, 6 insertions(+)

diff --git a/Kconfig b/Kconfig
index 4af1b42..5b55d87 100644
--- a/Kconfig
+++ b/Kconfig
@@ -5,4 +5,6 @@
mainmenu "Linux/$(ARCH) $(KERNELVERSION) Kernel Configuration"

+comment "Compiler: $(CC_VERSION_TEXT)"
source "arch/$(SRCARCH)/Kconfig"
diff --git a/Makefile b/Makefile
index 01b2211..7529825 100644
--- a/Makefile
+++ b/Makefile

+export CC_VERSION_TEXT := $(shell $(CC) --version | head -n 1)
# When compiling out-of-tree modules, put MODVERDIR in the module
# tree rather than in the kernel tree. The kernel tree might
# even be read-only.
diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index 6a15c4d..a992f8e 100644
--- a/arch/x86/um/Kconfig
+++ b/arch/x86/um/Kconfig
@@ -1,6 +1,8 @@
# SPDX-License-Identifier: GPL-2.0
mainmenu "User Mode Linux/$(SUBARCH) $(KERNELVERSION) Kernel Configuration"

+comment "Compiler: $(CC_VERSION_TEXT)"
source "arch/um/Kconfig.common"

menu "UML-specific options"
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