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kbuild: rebuild GCC plugins when the compiler is upgraded

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Linus reported a build error due to the GCC plugin incompatibility
when the compiler is upgraded. [1]

GCC plugins are tied to a particular GCC version. So, they must be
rebuilt when the compiler is upgraded.

This seems to be a long-standing flaw since the initial support of
GCC plugins.

Extend commit 8b59cd81dc ("kbuild: ensure full rebuild when the
compiler is updated"), so that GCC plugins are covered by the
compiler upgrade detection.

[1]: https://lore.kernel.org/lkml/CAHk-=wieoN5ttOy7SnsGwZv+Fni3R6m-Ut=oxih6bbZ28G+4dw@mail.gmail.com/

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Masahiro Yamada 2021-03-04 20:37:08 +09:00
parent 1f09af0625
commit ce6ed1c4c9
5 changed files with 20 additions and 6 deletions
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14
include/linux/compiler-version.h Normal file
View file

@ -0,0 +1,14 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifdef __LINUX_COMPILER_VERSION_H
#error "Please do not include <linux/compiler-version.h>. This is done by the build system."
#endif
#define __LINUX_COMPILER_VERSION_H
/*
* This header exists to force full rebuild when the compiler is upgraded.
*
* When fixdep scans this, it will find this string "CONFIG_CC_VERSION_TEXT"
* and add dependency on include/config/cc/version/text.h, which is touched
* by Kconfig when the version string from the compiler changes.
*/