Hi,

I compiled  this C#/Mono program on an UTF-8 GNU/Linux System


using System;

public class Hello
{
    static void Main()
    {
Console.WriteLine("STDOUT");
Console.Error.WriteLine("STDERR");
    }
}

and used this elisp code to get the process output:


(let ((default-process-coding-system '(utf-8-with-signature .
utf-8-with-signature)))
  (start-file-process
   "BOM"
   (generate-new-buffer "*bom-test*")
   "~/tmp/Hello.exe"))

This results in the following process-buffer (hexl-mode):

00000000: efbb bf53 5444 4f55 540a 5354 4445 5252  ...STDOUT.STDERR
00000010: 0a0a 5072 6f63 6573 7320 424f 4d20 6669  ..Process BOM fi
00000020: 6e69 7368 6564 0a                        nished.

The stdout BOM was correctly removed but the stderr BOM is still present.

According to
http://www.gnu.org/software/emacs/manual/html_node/elisp/Output-from-Processes.html

there is now way to handle stderr separately. I made this workaround for
the Emacs fsharp-mode:

https://github.com/juergenhoetzel/fsharpbinding/commit/d0d3600c38d0e9f47a621583d0fc82685feda196

Are there any better solutions?

Jürgen