Commit 8b59cd81 authored Apr 23, 2020 by Masahiro Yamada

kbuild: ensure full rebuild when the compiler is updated



Commit 21c54b77 ("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>

parent e33ae3ed

Kconfig

+0 −2

Original line number	Diff line number	Diff line
		@@ -5,8 +5,6 @@
		#
		mainmenu "Linux/$(ARCH) $(KERNELVERSION) Kernel Configuration"

		comment "Compiler: $(CC_VERSION_TEXT)"

		source "scripts/Kconfig.include"

		source "init/Kconfig"

include/linux/kconfig.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -2,6 +2,8 @@
		#ifndef __LINUX_KCONFIG_H
		#define __LINUX_KCONFIG_H

		/* CONFIG_CC_VERSION_TEXT (Do not delete this comment. See help in Kconfig) */

		#include <generated/autoconf.h>

		#ifdef CONFIG_CPU_BIG_ENDIAN

init/Kconfig

+17 −0

Original line number	Diff line number	Diff line
		@@ -8,6 +8,23 @@ config DEFCONFIG_LIST
		default "/boot/config-$(shell,uname -r)"
		default "arch/$(SRCARCH)/configs/$(KBUILD_DEFCONFIG)"

		config CC_VERSION_TEXT
		string
		default "$(CC_VERSION_TEXT)"
		help
		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)

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