Creating sysimage fails on Windows

[abhro]

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