[FS#3908] OpenWRT 21.02 fails to build with glibc and libstdc++ on imx6 during toolchain libtsan

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Fabian Pflug (gumulka) 

Attached to Project - OpenWrt/LEDE Project
Summary - OpenWRT 21.02 fails to build with glibc and libstdc++ on imx6 during toolchain libtsan
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I'm not sure on how to solve this issue. Wanting to go from 19.07 to 21.02 I could not build the basic system.

=====Steps to reproduce=====

#!/bin/sh

git clone https://git.openwrt.org/openwrt/openwrt.git
cd openwrt
git checkout openwrt-21.02
# was d666ebcaa327a1e03992a484d9601ea5f2e6b19a
cat > .config