Files generated during precompile do not get added to compilation

[pranavkm]

Steps to reproduce

Consider a project.json with a scripts node like so

"scripts": {
    "precompile": "cmd /c echo namespace Test { public class Foo {} } > Test.cs"
  }

Referencing Test.Foo does not work in the first compile when the file is not on disk. Having an empty Test.cs which gets populated during precompile works. It looks like the build is calculating the set of files to compile earlier than precompile. Perhaps it needs to do it after?

dotnet --info output: 1.0.0-preview3-003150

[ocdi]

I am trying to use the precompile script to generate some files and have the same issue, the first compile they aren't included. I'm using 1.0.0-preview2-003121.

[stickybun]

This is also an issue for embedding files which are created during precompile.

For example:

project.json

"buildOptions": {
    "embed": {
      "include": "*.txt"
    }
  }

"scripts": {
    "precompile": [
      "bash -c \"touch $(date +%H%M%S).txt\""
    ]
  }

or on Windows:

  "scripts": {
    "precompile": [
      "cmd /c echo \"\" >>  %time:~1,1%%time:~3,2%%time:~6,2%.txt"
    ]
  }

Program.cs

public static void Main(string[] args)
{
    var embeddedCount = System.Reflection.Assembly.GetEntryAssembly().GetManifestResourceNames().Count(m=>m.EndsWith(".txt"));
    var actualCount = System.IO.Directory.GetFiles(".","*.txt").Length;
    Console.WriteLine($"Number of txt resources: {embeddedCount}, actual number of files: {actualCount}");
}

Output
Number of txt resources: 0, actual number of files: 1
Number of txt resources: 1, actual number of files: 2
Number of txt resources: 2, actual number of files: 3

Expected Output
Number of txt resources: 1, actual number of files: 1

Version: 1.0.0-preview2-003121

[TanukiSharp]

I confirm the issue, with 1.0.0-preview2-003121.

[chwarr]

This looks like a duplicate of https://github.com/dotnet/cli/issues/1475 to me. That issue mentions a possible workaround: have dummy files that get overwritten by the precompile scripts. This is working for me.

I doubt that this will get fixed, with the planned move to MSBuild-based builds.

(Though I work for Microsoft, I'm not associated with this project.)

[livarcocc]

This will work with preview3.