Bug#1053655: Cherry-pick upstream patch D142688 to fix the build failure on loong64

[Li Chen]

Package: llvm-toolchain-16
Version: 1:16.0.6-16
Severity: important
Tags: patch
User: debian-devel at lists.debian.org
Usertags: loongarch64


Dear Maintainer,

llvm-toolchain-16 run into a build failure on loong64. It fails at 
stage2 build because of lacking of multiarch triple information[1].

Without the information above, clang does not work well on loong64 on 
Debian system.

This issue is fixed at  llvmorg-17.0.0-rc1 version[2]. LoongArch is 
supported since llvm16, thus only llvm-toolchain-16 has the problem.

The attached patch is backported from llvmorg-17.0.0-rc1 to fix the 
issue in llvm-toolchain-16.


Please consider the patch attached.

Thanks.


[1] 
https://buildd.debian.org/status/logs.php?pkg=llvm-toolchain-16&ver=1%3A16.0.6-15&arch=loong64

[2] https://reviews.llvm.org/D142688

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