julia 1.8.5 - could not load library "libssp.so.0" (linux)

[t-bltg]

I've just built julia 1.8.5 from sources (this is usually what I do when a julia version is available).
My Make.user contains:

USE_BINARYBUILDER := 0
USE_SYSTEM_CSL := 1
USE_GPL_LIBS := 1

After installing, precompilation fails:

ERROR: LoadError: InitError: could not load library "libssp.so.0"
libssp.so.0: cannot open shared object file: No such file or directory
Stacktrace:
  [1] dlopen(s::String, flags::UInt32; throw_error::Bool)
    @ Base.Libc.Libdl ./libdl.jl:117
  [2] dlopen (repeats 2 times)
    @ ./libdl.jl:116 [inlined]
  [3] __init__()
    @ CompilerSupportLibraries_jll $PREFIX/share/julia/stdlib/v1.8/CompilerSupportLibraries_jll/src/CompilerSupportLibraries_jll.jl:67
  [4] _include_from_serialized(pkg::Base.PkgId, path::String, depmods::Vector{Any})
    @ Base ./loading.jl:831
  [5] _require_search_from_serialized(pkg::Base.PkgId, sourcepath::String, build_id::UInt64)
    @ Base ./loading.jl:1039
  [6] _require(pkg::Base.PkgId)
    @ Base ./loading.jl:1315
  [7] _require_prelocked(uuidkey::Base.PkgId)
    @ Base ./loading.jl:1200
  [8] macro expansion
    @ ./loading.jl:1180 [inlined]
  [9] macro expansion
    @ ./lock.jl:223 [inlined]
 [10] require(into::Module, mod::Symbol)
    @ Base ./loading.jl:1144
 [11] include(mod::Module, _path::String)
    @ Base ./Base.jl:419
 [12] top-level scope
    @ ~/.julia/packages/JLLWrappers/QpMQW/src/toplevel_generators.jl:188
 [13] include
    @ ./Base.jl:419 [inlined]
 [14] include_package_for_output(pkg::Base.PkgId, input::String, depot_path::Vector{String}, dl_load_path::Vector{String}, load_path::Vector{String}, concrete_deps::Vector{Pair{Base.PkgId, UInt64}}, source::String)
    @ Base ./loading.jl:1554
 [15] top-level scope
    @ stdin:1
during initialization of module CompilerSupportLibraries_jll

Probably induced by #48027.
I don't understand what is the justification for requiring this library on OSs other than windows.

cc @giordano.

[giordano]

I don't understand what is the justification for requiring this library on OSes other than windows.

It was linked by the PR which introduced it, #48012 (comment):

Yes, I think it would be best to do this consistently across OS's, where possible. :)

[t-bltg]

Sorry, but that is not a justification. It introduces a hard library dependency where it is not needed. It should be made optional / non-fatal, since libssp is usually not available e.g. on linux.

A trivial post-install workaround:

$ echo | gcc -shared -o $PREFIX/lib/julia/libssp.so.0 -xc -

[giordano]

@staticfloat ?