Pass -fno-delete-null-pointer-checks to Clang under MKSANITIZER/MKLIBCSANITIZER

To: Taylor R Campbell <riastradh%netbsd.org@localhost>, NetBSD Discussion List User-Level Technical <tech-userlevel%netbsd.org@localhost>
Subject: Pass -fno-delete-null-pointer-checks to Clang under MKSANITIZER/MKLIBCSANITIZER
From: Kamil Rytarowski <n54%gmx.com@localhost>
Date: Wed, 13 May 2020 19:07:10 +0200

I propose to pass -fno-delete-null-pointer-checks to Clang under
MKSANITIZER/MKLIBCSANITIZER.

http://netbsd.org/~kamil/patch-00251-rump-fno-delete-null-pointer-checks.txt

This disabled alerts from Clang and permits to run sanitized rump.

Meanwhile as far as I am aware, the C committee was prompted to discuss
NULL+0 operations. In future we can either adapt the code to the
decisions taken in the toolchains.

We intend to fuzz sanitized rump during the upcoming GSoC period.

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Follow-Ups:
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  - From: Kamil Rytarowski
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  - From: Kamil Rytarowski

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