Error compiling with CodeDom on .netcore 3.1 (2.0.0)

[tiagosilvacosta]

HI,

I´m trying the 2.0.0 version and I´m having some trouble compiling simple code with codedom. (Because I would like to use Caching) Using Roslyn, everything works. But when I change do CodeDom I get a "BUILD: error : Unknown compiler error".

I can see the sources files being created at %temp%\CSSCRIPT and also the cache dir.

I´m runining on Windows, .netcore 3.1 console app and using one sample code:

        dynamic script = CSScript.CodeDomEvaluator
                                 .LoadMethod(@"public object func()
                                               {
                                                   // return (0,5);   // C# latest syntax
                                                   return new[]{0,5}; // C# 5 syntax
                                               }");

Can you help me finding where is the problem? Best regards!

[oleg-shilo]

Just to avoid any confusion, can you check if you can build and run the attached project without the problem?
ConsoleApp3.zip

[tiagosilvacosta]

Thanks for the prompt reply! I can build the project. But running causes the same error: [image: image.png] Best regards, Tiago <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Livre de vírus. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>. <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> Em qui., 11 de mar. de 2021 às 08:50, Oleg Shilo ***@***.***> escreveu:

…

Just to avoid any confusion, can you check if you can build and run the attached project without the problem? ConsoleApp3.zip <https://github.com/oleg-shilo/cs-script.core/files/6122732/ConsoleApp3.zip> — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#23 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ALRSSUCIZAXGMLB4CMD6QUTTDCVALANCNFSM4Y7AIPIA> .

-- Atenciosamente, *Quer enxergar melhor a saúde comercial de sua empresa e passar a vender mais, com mais * *eficiência? Clique aqui <http://ecalc.com.br/whitepaper.php?id=23> e tenha acesso a um conteúdo exclusivo.*

[oleg-shilo]

you will need to use github as your uimages are not displayed.

Anyway, do you use have .NET 5 installed? If you don't then it may explain the problem

[tiagosilvacosta]

Oleg, I don´t have .NET 5 installed. Roselyn works for netCore 3.1, but CodeDom works only with NET5 installed? So the way to go is Roselyn while .net5 is not present, is that correct? Best regards, Tiago <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> Livre de vírus. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>. <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> Em qui., 11 de mar. de 2021 às 09:58, Oleg Shilo ***@***.***> escreveu:

…

you will need to use github as your uimages are not displayed. Anyway, do you use have .NET 5 installed? If you don't then it may explain the problem — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#23 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ALRSSUCCC56Y6VCFOFO7UKLTDC47HANCNFSM4Y7AIPIA> .

-- Atenciosamente, *Quer enxergar melhor a saúde comercial de sua empresa e passar a vender mais, com mais * *eficiência? Clique aqui <http://ecalc.com.br/whitepaper.php?id=23> e tenha acesso a um conteúdo exclusivo.*

[oleg-shilo]

Correct.
CodeDom compiler was only introduced in version 2.0.0 as part of migration on .NET 5 platform. Thus CodeDom is using csc.exe compiler from ..NET 5 toolset.

Interestingly enough if the the right csc.exe is located then most likely it will be able to work even on older versions of .NET Core.

This is how build server locates csc.exe :

cs-script.core/src/cscs/BuildServer.cs

Lines 19 to 53 in 9a9169d

	static public string csc
	{
	get
	{
	if (csc_asm_file == null)
	{
	// linux ~dotnet/.../3.0.100-preview5-011568/Roslyn/... (cannot find in preview)
	// win: program_files/dotnet/sdk/<version>/Roslyn/csc.dll
	var dotnet_root = "".GetType().Assembly.Location;
	// find first "dotnet" parent dir by trimming till the last "dotnet" token
	dotnet_root = String.Join(Path.DirectorySeparatorChar,
	dotnet_root.Split(Path.DirectorySeparatorChar)
	.Reverse()
	.SkipWhile(x => x != "dotnet")
	.Reverse()
	.ToArray());
	var sdkDir = Path.Combine(dotnet_root, "sdk");
	if (Directory.Exists(sdkDir)) // need to check as otherwise it will throw
	{
	var dirs = Directory.GetDirectories(sdkDir)
	.Where(dir => { var firstChar = Path.GetFileName(dir)[0]; return char.IsDigit(firstChar); })
	.OrderBy(x => Version.Parse(Path.GetFileName(x).Split('-').First()))
	.ThenBy(x => Path.GetFileName(x).Split('-').Length)
	.SelectMany(dir => Directory.GetDirectories(dir, "Roslyn"))
	.ToArray();
	csc_asm_file = dirs.Select(dir => Path.Combine(dir, "bincore", "csc.dll"))
	.LastOrDefault(File.Exists);
	}
	}
	return csc_asm_file;
	}
	}

Can you please try this algorithm on your environment and see if it finds csc.exe. I do not have .NET Core v3.* environment any more so cannot test.

If it finds it (though unlikely) then the compiler (csc.exe) does not work the same way as under .NET 5 and nothing we can do about it.

However if csc is not found them we simply need to update the probing algorithm and then CodeDomEvaluator most likely it will start working as expected even on v3.1

[tiagosilvacosta]

It did find the dll file correctly. (C:\Program Files\dotnet\sdk\3.1.407\Roslyn\bincore\csc.dll)

So, can I assume that the "Roselyn" compiler will continue working on older versions of netcore?

[oleg-shilo]

Correct.

Though, I decided to give it a try. Before re-releasing under CS-Script (immanent transition of CS-Script.Core->CS-Script) I will see if there is something that can be done to allow compiling on older platforms.

Marking it as "Enhancement"

Will keep you notified