armhf conflicts with amd64

[Anton]

Hello! I'm here with clang cross-compilation (x86_64 -> armhf) buster 
issue. Problem starts from 
https://github.com/conan-io/conan-center-index/issues/6777 but briefly I 
can compile m4 natively with -compiler-rt but cannot cross compile 
"/usr/bin/arm-linux-gnueabihf-ld: cannot find 
/usr/lib/llvm-11/lib/clang/11.0.1/lib/linux/libclang_rt.builtins-armhf.a: 
No such file or directory", looks like libclang-common-11-dev:armhf is 
missing (especially |libclang_rt.builtins-armhf.a)| but it conflicts 
with libclang-common-11-dev:amd64 so I have linkage error without armhf 
lib or compile time error without amd64 lib. After all of that 
clang-11:amd64 conflicts with clang-11:armhf. I can extract 
libclang_rt.* from armhf pkg and copy it to  
/usr/lib/llvm-11/lib/clang/11.0.1/lib/linux/, it works, I can compile m4 
but it's not the best way. I tried to discuss this situation with 
rengolin (irc #llvm), but he said packages should not conflict. What I 
do wrong? Thank you.

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