linux-kernel - PROBLEM: 5.11.0-rc7 fails to compile with error: ‘-mindirect-branch’ and ‘-fcf-protection’ are not compatible

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Date:   Sun, 7 Feb 2021 18:31:22 -0500
From:   Stuart Little <achirvasub@...il.com>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Marco Elver <elver@...gle.com>, Arnd Bergmann <arnd@...db.de>
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com
Subject: PROBLEM: 5.11.0-rc7 fails to compile with error: ‘-mindirect-branch’ and ‘-fcf-protection’ are not compatible

I am trying to compile on an x86_64 host for a 32-bit system; my config is at

https://termbin.com/v8jl

I am getting numerous errors of the form

./include/linux/kasan-checks.h:17:1: error: ‘-mindirect-branch’ and ‘-fcf-protection’ are not compatible

and

./include/linux/kcsan-checks.h:143:6: error: ‘-mindirect-branch’ and ‘-fcf-protection’ are not compatible

and

./arch/x86/include/asm/arch_hweight.h:16:1: error: ‘-mindirect-branch’ and ‘-fcf-protection’ are not compatible

(those include files indicated whom I should add to this list; apologies if this reaches you in error).

The full log of the build is at

https://termbin.com/wbgs

---

5.11.0-rc6 built fine last week on this same setup.