Various library bundling nits

[KristofferC]

Multiple copies of the same library on Windows:

On Windows we seem to concretize symlinks into copies of the libraries which leads to duplication:

-rw------- 1 kc kc 2.2M Sep  9 11:36 libblastrampoline-5-0-2.dll
-rw------- 1 kc kc 2.2M Sep  9 11:36 libblastrampoline-5.dll
-rw------- 1 kc kc 2.2M Sep  9 11:36 libblastrampoline.dll

We only use libblastrampoline.dll anyway.

Different libpcre2 versions shipped on Windows:

-rw------- 1 kc kc 689K Sep  9 11:37 libpcre2-16-0.dll
-rw------- 1 kc kc 689K Sep  9 11:37 libpcre2-16.dll
-rw------- 1 kc kc 661K Sep  9 11:37 libpcre2-32-0.dll
-rw------- 1 kc kc 661K Sep  9 11:37 libpcre2-32.dll
-rw------- 1 kc kc 751K Sep  9 11:37 libpcre2-8-0.dll
-rw------- 1 kc kc 751K Sep  9 11:37 libpcre2-8.dll
-rw------- 1 kc kc 112K Sep  9 11:37 libpcre2-posix-3.dll

but I think we only use libpcre2-8.dll.

Some LLVM support libs only shipped on Windows:

-rw------- 1 kc kc 293K Sep  9 11:37 libRemarks.dll
-rw------- 1 kc kc 390K Sep  9 11:37 libLTO.dll
-rw------- 1 kc kc 326K Sep  9 11:37 libmlir_async_runtime.dll
-rw------- 1 kc kc 901K Sep  9 11:37 libmlir_c_runner_utils.dll
-rw------- 1 kc kc 323K Sep  9 11:37 libmlir_runner_utils.dll

are they needed?

Inconsisteny in naming of libLLVM:

libLLVM.dylib
libLLVM-13jl.so 
libLLVM-13jl.dll

Maybe mac should have -13jl as well?

[giordano]

We only use libblastrampoline.dll anyway.

That's wrong though: JuliaLinearAlgebra/libblastrampoline#87

[inkydragon]

On Windows we seem to concretize symlinks into copies of the libraries which leads to duplication:

By default, ln -s copies the file on windows instead of creating a symbolic link.
Administrator privileges and an environment variable are required to create a real symbolic link.
A possible alternative is to create a hard link. cp -f --dereference --link src dst

• https://github.com/JuliaLinearAlgebra/libblastrampoline/blob/dbb8221eb0c9ecc7eea0ad57677b68965299032c/src/Makefile#L45-L52
• cygwin: https://stackoverflow.com/questions/3648819/how-to-make-a-symbolic-link-with-cygwin-in-windows-7
• MSYS2: https://stackoverflow.com/questions/61594025/symlink-in-msys2-copy-or-hard-link

Some LLVM support libs only shipped on Windows:

Those DLLs came from: https://github.com/JuliaBinaryWrappers/LLVM_jll.jl

[KristofferC]

A possible alternative is to create a hard link. cp -f --dereference --link src dst

Is there a need for any links at all? libblastrampoline seems to be the odd one out here of all the libraries on Windows with three copies.

Those DLLs came from: https://github.com/JuliaBinaryWrappers/LLVM_jll.jl

Are they needed for anything in the Julia installation?

[giordano]

With #47676 there will be a single copy of libblastrampoline on Windows, the different copies were error-prone anyway.