Meinersbur wrote:

> * build `../llvm` and install into `$PREFIX`
> * build `../runtimes` (using 
> `-DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind"`) and install into 
> `$PREFIX`
> * build `../clang` (while reusing the bits from llvm/libcxx in `$PREFIX`) and 
> install into `$PREFIX`
> * build `../compiler-rt` (while reusing the bits from clang in `$PREFIX`) and 
> install into `$PREFIX`
> * build `../mlir` (while reusing the bits from llvm in `$PREFIX`) and install 
> into `$PREFIX`
> * build `../flang` (while reusing all the other bits in `$PREFIX`) and 
> install into `$PREFIX`
> * build `../flang-rt`

Flang-RT also needs to be installed into $PREFIX, and Flang invoked from 
`${PREFIX}/bin/flang`. Flang is not able to guess flang-rt's build.

> If you want I can work out a full script that does this, but this is why we 
> might arrive in a different place, conceptually speaking.

Yes, that would be helpful.


https://github.com/llvm/llvm-project/pull/110217
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