Creating sysimage for BFloat16s.jl fails on Windows

[abhro]

This issue is a duplicate of JuliaMath/BFloat16s.jl#88. I'm unsure which package is causing this issue however, so I'm essentially cross-posting here. A copy of the transcript is presented below:

Creation of a sysimage fails because g++ cannot find the required symbols (linking error). Minimal working example is to write a script bfloat16s-sysimage-creator.jl:

import Pkg

Pkg.activate(temp = true)

Pkg.add(["BFloat16s", "PackageCompiler"])

using PackageCompiler

create_sysimage(["BFloat16s"], sysimage_path = "bfloat16s-sysimage.dll")

The output of which is piped into a text file (see attachment bfloat16s-packagecompiler-log.txt)

The file is mostly warnings about unrecognized drectives, which also happens on other sysimage creation. The relevant lines are

$HOME\AppData\Local\Temp\jl_tyfKvKlihE-o.a(text#1.o): In function `BFloat16':
$HOME\.julia\packages\BFloat16s\u3WQc\src/bfloat16.jl:158: undefined reference to `__truncdfbf2'
$HOME\AppData\Local\Temp\jl_tyfKvKlihE-o.a(text#15.o): In function `BFloat16':
$HOME\.julia\packages\BFloat16s\u3WQc\src/bfloat16.jl:158: undefined reference to `__truncdfbf2'
collect2.exe: error: ld returned 1 exit status

[dgleich]

This also seems to occur with MLDatasets.jl on MacOS x86_64. (Which has BFloat16s via some chain of dependencies.)

✔ [02m:44s] PackageCompiler: compiling incremental system image
Undefined symbols for architecture x86_64:
  "___truncdfbf2", referenced from:
      _julia_BFloat16_47806 in jl_fCv4HAVk5o-o.a[2](text#0.o)
      _julia_BFloat16_47814 in jl_fCv4HAVk5o-o.a[4](text#2.o)
      _julia_BFloat16_47814 in jl_fCv4HAVk5o-o.a[4](text#2.o)
ld: symbol(s) not found for architecture x86_64
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

julia> versioninfo()
Julia Version 1.11.2
Commit 5e9a32e7af2 (2024-12-01 20:02 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: macOS (x86_64-apple-darwin24.0.0)
  CPU: 16 × Intel(R) Xeon(R) W-2140B CPU @ 3.20GHz
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, skylake-avx512)
Threads: 1 default, 0 interactive, 1 GC (on 16 virtual cores)

(@TCB) pkg> st PackageCompiler
Status `~/.julia/environments/TCB/Project.toml`
  [9b87118b] PackageCompiler v2.1.24

[dgleich]

Possibly related... JuliaLang/julia#52067