Commit 21c54b77 authored May 28, 2018 by Masahiro Yamada

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
include/config/auto.conf.cmd

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

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Kees Cook <keescook@chromium.org>

parent 2bece88f

Kconfig

+2 −0

Original line number	Diff line number	Diff line
		@@ -5,4 +5,6 @@
		#
		mainmenu "Linux/$(ARCH) $(KERNELVERSION) Kernel Configuration"

		comment "Compiler: $(CC_VERSION_TEXT)"

		source "arch/$(SRCARCH)/Kconfig"

Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -442,6 +442,8 @@ export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
		export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
		export KBUILD_ARFLAGS

		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.

arch/x86/um/Kconfig

+2 −0

Original line number	Diff line number	Diff line
		# 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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