Re: [RFC] Use LLVM_BUILD_LLVM_DYLIB instead of BUILD_SHARED_LIBS

[Maxime Devos]

On 20-04-2022 12:56, Zhu Zihao wrote:
> We may introduce following problems if we apply this solution.
>
> 1. Increase the closure size of LLVM.
>
> By default, if LLVM_BUILD_LLVM_DYLIB is set true, LLVM still tries to
> build the static archive. This may increase the closure size of LLVM.
> And some package linking with LLVM may use the static archive instead of
> linking to the dynamic library.
>
> My opinion: If we're OK with the bigger closure size, that's not a
> problem. If not, we may consider disable the static archive generation.
> For LLVM components, we can use `LLVM_LINK_LLVM_DYLIB` to ask these
> packages to link with the shared version. For package use `llvm-config`
> directly or indirectly, we can pass `--link-shared` to it.

IIUC, this causes the static libraries to be built, right?

If so, they could be moved into a separate output.

I would prefer to disable static libraries, those cause problems with 
grafts and size usage. If not possible, I would prefer them to be in a 
separate output, to avoid them being used by accident and to reduce the 
closure size of dependents of LLVM that use the shared version.

Greetings,
Maxime.

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