older toolchains not valid anymore #74521
Merged
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with the change to llvm 10 the parameter
LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN do not do anything as min and soft error is the same.
see https://github.com/rust-lang/llvm-project/blob/86b120e6f302d39cd6973b6391fb299d7bc22122/llvm/cmake/modules/CheckCompilerVersion.cmake