llvm dev - Nov 2019 - Versioned dylibs and llvm-config

Unless I’m mistaken, back under the autoconf system dylibs were shipped
versioned (libLLVM-{VERSION}.dylib). Indeed this is what llvm-config looks for.

On the move to CMake however, this is no longer happens on macOS:
https://github.com/llvm/llvm-project/blob/ab411801b82783eb7f652701ccfce81b16cf1811/llvm/cmake/modules/AddLLVM.cmake#L562
<https://github.com/llvm/llvm-project/blob/ab411801b82783eb7f652701ccfce81b16cf1811/llvm/cmake/modules/AddLLVM.cmake#L562>

However, llvm-config still explicitly looks for versioned dylibs:
https://github.com/llvm/llvm-project/blob/bec37c3fc766a7b97f8c52c181c325fd47b75259/llvm/tools/llvm-config/llvm-config.cpp#L378
<https://github.com/llvm/llvm-project/blob/bec37c3fc766a7b97f8c52c181c325fd47b75259/llvm/tools/llvm-config/llvm-config.cpp#L378>

So my question is: which one is correct? Unless I’ve missed something,
llvm-config doesn’t function properly on macOS under LLVM_BUILD_LLVM_DYLIB and
hasn’t done so for a few years now. This has raised a few bug reports, most
recently in Homebrew.

For reference, this issue has been mentioned a couple times:
- https://bugs.llvm.org/show_bug.cgi?id=40252
<https://bugs.llvm.org/show_bug.cgi?id=40252>
- as a (late) comment to https://reviews.llvm.org/D13841
<https://reviews.llvm.org/D13841>

Any thoughts?

Bo
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