LKFT have noticed these warnings / errors when we have updated gcc version from gcc-9 to gcc-11 on stable-rc linux-5.4.y branch. I have provided the steps to reproduce in this email below.

Following perf builds failed with gcc-11 with linux-5.4.y branch. - build-arm-gcc-11-perf - build-arm64-gcc-11-perf - build-i386-gcc-11-perf - build-x86-gcc-11-perf

Build error log: -------------------- find: 'x86_64-linux-gnu-gcc/arch': No such file or directory error: Found argument '-I' which wasn't expected, or isn't valid in this context USAGE: sccache [FLAGS] [OPTIONS] [cmd]... For more information try --help error: Found argument '-I' which wasn't expected, or isn't valid in this context USAGE: sccache [FLAGS] [OPTIONS] [cmd]... For more information try --help

In function 'ready', inlined from 'sender' at bench/sched-messaging.c:87:2: bench/sched-messaging.c:73:13: error: 'dummy' may be used uninitialized [-Werror=maybe-uninitialized] 73 | if (write(ready_out, &dummy, 1) != 1) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from bench/sched-messaging.c:22: bench/sched-messaging.c: In function 'sender': /usr/x86_64-linux-gnu/include/unistd.h:366:16: note: by argument 2 of type 'const void *' to 'write' declared here 366 | extern ssize_t write (int __fd, const void *__buf, size_t __n) __wur; | ^~~~~ bench/sched-messaging.c:69:14: note: 'dummy' declared here 69 | char dummy; | ^~~~~ cc1: all warnings being treated as errors

ref: https://builds.tuxbuild.com/1vEIWryaujwVtL4wmodXkz1djUa/ https://builds.tuxbuild.com/1vEIX7NTo5OpaN9nrs2UvO74oxB/

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

Steps to reproduce: --------------------------- tuxmake --runtime podman --target-arch x86_64 --toolchain gcc-11 --kconfig defconfig --kconfig-add https://builds.tuxbuild.com/1vEIWryaujwVtL4wmodXkz1djUa/config headers kernel modules perf

-- Linaro LKFT https://lkft.linaro.org