Clp.jl on Alpine Linux, x86_64-linux-musl-gcc8-cxx11 is not supported

[peteristhegreat]

Starting with the julia v1.3.1 image of alpine (docker pull fredrikekre/julia-alpine:1.3.1), I am getting this error for the Clp.jl package

               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.3.1 (2019-12-30)
 _/ |\__'_|_|_|\__'_|  |  github.com/fredrikekre/julia-alpine build
|__/                   |

(v1.3) pkg> build Clp
  Building Clp → `~/.julia/packages/Clp/IBQzB/deps/build.log`
┌ Error: Error building `Clp`:
│ ERROR: LoadError: Your platform ("x86_64-alpine-linux-musl", parsed as "x86_64-linux-musl-gcc8-cxx11") is not supported by this package!
│ Stacktrace:
│  [1] error(::String) at ./error.jl:33
│  [2] top-level scope at /root/.julia/packages/Clp/IBQzB/deps/build.jl:76
│  [3] include at ./boot.jl:328 [inlined]
│  [4] include_relative(::Module, ::String) at ./loading.jl:1105
│  [5] include(::Module, ::String) at ./Base.jl:31
│  [6] include(::String) at ./client.jl:424
│  [7] top-level scope at none:5
│ in expression starting at /root/.julia/packages/Clp/IBQzB/deps/build.jl:67
└ @ Pkg.Operations /julia-source/usr/share/julia/stdlib/v1.3/Pkg/src/backwards_compatible_isolation.jl:649

https://github.com/JuliaBinaryWrappers/Clp_jll.jl/

And its wrapper page directed me here.

uname -a
Linux d1a3a7507047 4.19.121-linuxkit #1 SMP Thu Jan 21 15:36:34 UTC 2021 x86_64 Linux

Note that CMake.jl had issues, too, so I did apk add cmake, and symlinked that version of cmake into the CMake.jl deps/usr/bin folder... but that isn't a Yggdrasil issue directly.

[giordano]

There is absolutely no way the error

Your platform ("x86_64-alpine-linux-musl", parsed as "x86_64-linux-musl-gcc8-cxx11") is not supported by this package!

is thrown by Clp_jll.jl. You're likely using an old version of Clp.jl which didn't use JLL packages at all. Besides that, JLL packages on musl systems work (mostly) only on Julia v1.6, apart from a serious bug in their loader: JuliaLang/julia#40556.

Note also that the official Julia Docker image now has Alpine Linux among supported platforms, so no need to use third-party images.