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

[abhro]

Issue resolved on its own, may have been related to compiler artifact version

[Optimus-Pine]

I'm experiencing a similar issue on MacOS. Running the same script with Julia 1.11.5+0.x64.apple.darwin14 or Development version 1.13.0-DEV.684 produces the same output. Relevant lines below.
BFloat16s v0.5.1
PackageCompiler v2.2.1

✔ [02m:11s] PackageCompiler: compiling incremental system image
Undefined symbols for architecture x86_64:
  "___truncdfbf2", referenced from:
      _julia_BFloat16_78217 in jl_2rGNubOfE3-o.a[2](text#0.o)
      _julia_BFloat16_78207 in jl_2rGNubOfE3-o.a[5](text#3.o)
      _julia_BFloat16_78193 in jl_2rGNubOfE3-o.a[7](text#5.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ERROR: failed process: Process(`g++ -m64 -march=x86-64 -shared -L/Users/sam.pine/.julia/juliaup/julia-nightly/lib -L/Users/sam.pine/.julia/juliaup/julia-nightly/lib/julia -o bfloat16s-sysimage.dll -Wl,-all_load /var/folders/_l/r8s7y6fx5y34ln87rl5ybl0h0000gt/T/jl_2rGNubOfE3-o.a -ljulia -ljulia-internal -fPIC -Wl,-rpath,@executable_path -Wl,-rpath,@executable_path/julia`, ProcessExited(1)) [1]

Stacktrace:
 [1] pipeline_error
   @ ./process.jl:602 [inlined]
 [2] run(::Cmd; wait::Bool)
   @ Base ./process.jl:517
 [3] run
   @ ./process.jl:514 [inlined]
 [4] run_compiler(cmd::Cmd; cplusplus::Bool)
   @ PackageCompiler ~/.julia/packages/PackageCompiler/cTtGY/src/PackageCompiler.jl:196
 [5] run_compiler
   @ ~/.julia/packages/PackageCompiler/cTtGY/src/PackageCompiler.jl:192 [inlined]
 [6] create_sysimg_from_object_file(object_files::Vector{String}, sysimage_path::String; version::Nothing, compat_level::String, soname::Nothing)
   @ PackageCompiler ~/.julia/packages/PackageCompiler/cTtGY/src/PackageCompiler.jl:709
 [7] create_sysimg_from_object_file
   @ ~/.julia/packages/PackageCompiler/cTtGY/src/PackageCompiler.jl:695 [inlined]
 [8] create_sysimage(packages::Vector{…}; sysimage_path::String, project::String, precompile_execution_file::Vector{…}, precompile_statements_file::Vector{…}, incremental::Bool, filter_stdlibs::Bool, cpu_target::String, script::Nothing, sysimage_build_args::Cmd, include_transitive_dependencies::Bool, base_sysimage::Nothing, julia_init_c_file::Nothing, julia_init_h_file::Nothing, version::Nothing, soname::Nothing, compat_level::String, extra_precompiles::String, import_into_main::Bool)
   @ PackageCompiler ~/.julia/packages/PackageCompiler/cTtGY/src/PackageCompiler.jl:675
 [9] top-level scope
   @ REPL[5]:1

[Optimus-Pine]

Was able to resolve by updating to g++ (Homebrew GCC 15.1.0) 15.1.0.