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kern.mk: -Wno-error=stringop-overflow for gcc due to false positives
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Authored by rlibby on Nov 28 2019, 11:51 PM.
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Details

Summary

Demote gcc's Wstringop-overflow to Wno-error due to false positives.
E.g. the riscv64 build with gcc 8.3.0 has been failing with this warning
since r355062 [1]. A bug has been filed with gcc [2]. The warning was
first introduced in gcc 7.1 [3]. Hopefully we can avoiding suppressing
the warning in future gcc versions.

[1] https://ci.freebsd.org/job/FreeBSD-head-riscv64-build/16691/
[2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92718
[3] https://gcc.gnu.org/wiki/WarningHistory

Test Plan

make CROSS_TOOLCHAIN=riscv64-gcc TARGET=riscv TARGET_ARCH=riscv64 buildkernel KERNCONF=GENERIC

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Repository
rS FreeBSD src repository - subversion
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