Bug in simulation verification

[tobias1012]

Type of issue: Bug Report

Please provide the steps to reproduce the problem:
Any Test on windows 10 should recreate this behaviour

What is the current behavior?
The simulator (somewhere) tries to create files that are not valid unicode.

chisel/core/src/main/scala/chisel3/layers/Layers.scala

Lines 14 to 18 in d94ae23

	/** The [[chisel3.layer.Layer]] where all assertions will be placed. */
	object Assert
	extends Layer(LayerConfig.Extract(CustomOutputDir(Paths.get("verification", "assert"))))(
	_parent = Verification,
	_sourceInfo = UnlocatableSourceInfo

does not seem to have any effect on the created directories even though the firtool tries to create an output related to these layers. Note the code shows lowercase while the output is trying to create uppercase.

What is the expected behavior?
folders for the layers are created correctly

Please tell us about your environment:
version: master snapshot
OS: Windows 10

Other Information
Error:
[info] <stdin>:0:0: error: cannot create output directory "C:\Users\...\AppData\Local\Temp\chiselsim-2025-03-13T11-39-25.1344942003004127992777573105\support-artifacts\Verification?ver": Unicode-symbol does not exist in the multibyte symbol-table.
Generated SystemVerilog for simulating

[info]   "sv.verbatim"() <{format_string = "`include \22Verification\\layers-MyModule-Verification.sv\22\0A`ifndef layers_MyModule_Verification_Cover\0A`define layers_MyModule_Verification_Cover", symbols = []}> {output_file = #hw.output_file<"Verification\FFver\\layers-MyModule-Verification-Cover.sv", excludeFromFileList>} : () -> ()
[info]   "sv.verbatim"() <{format_string = "`include \22Verification\\layers-MyModule-Verification.sv\22\0A`ifndef layers_MyModule_Verification_Assume\0A`define layers_MyModule_Verification_Assume", symbols = []}> {output_file = #hw.output_file<"Verification\FFsume\\layers-MyModule-Verification-Assume.sv", excludeFromFileList>} : () -> ()
[info]   "sv.verbatim"() <{format_string = "`include \22Verification\\layers-MyModule-Verification.sv\22\0A`ifndef layers_MyModule_Verification_Assert\0A`define layers_MyModule_Verification_Assert", symbols = []}> {output_file = #hw.output_file<"Verification\FFsert\\layers-MyModule-Verification-Assert.sv", excludeFromFileList>} : () -> ()

What is the use case for changing the behavior?
Support on windows

[tobias1012]

My guess is this is a bug in the interaction of chisel and firtool, however I have not been able to find any code that could generate the files wrong

[seldridge]

I agree I suspect this is something in the Chisel or Chisel/firtool interaction as we do run all CIRCT tests on Windows.

[tobias1012]

The interesting part here is there seems to be no issues when using chisel.stage.emitSystemVerilog and manually adding layers