Can't use a native library from the user's PATH with Fake 5.14+

[BillHally]

Description

Can't use a native library from the user's PATH with Fake 5.14+.

Repro steps

1. Use functionality (whether from a Nuget package or written directly into a script) which relies on a native library being in the PATH environment variable rather than a Nuget package. For example:

#load ".fake/build.fsx/intellisense.fsx"

open Fake.Core

open System.Runtime.InteropServices

module Imports =
    [<DllImport("kernel32.dll")>]
    extern uint32 GetCurrentProcessId()

Target.create "Build" (fun _ ->
  printfn "Current process: %d" (Imports.GetCurrentProcessId())
)

Target.runOrDefault "Build"

There's a small repository demonstrating the issue at https://github.com/BillHally/FakeNativeLibraryIssue.

Expected behavior

Functionality works

Actual behavior

An exception is raised. For example:

Build      00:00:00.0056542   (Could not resolve native library 'kernel32.dll'.                                                                                                                                                                                                                                                                                            No native libraries found!

This can happen for various reasons:
- The nuget cache (or packages folder) might be broken.
  -> Please save your state, open an issue and then
  - delete the source package of 'kernel32.dll' from the '~/.nuget' cache (and the 'packages' folder)
  - delete 'paket-files/paket.restore.cached' if it exists
  - delete '<script.fsx>.lock' if it exists
  - try running fake again
  - the package should be downloaded again

-> If the above doesn't apply or you need help please open an issue!)

Known workarounds

Use Fake v 5.13.7

Related information

• Operating system - Windows 10
• Version of FAKE - > 5.14

[matthid]

Ah indeed, didn't realize that FAKE already supported this. Shouldn't be too hard to add this. Question is if we can properly detect this case and report the above error otherwise.

[matthid]

Thanks for reporting this.

[matthid]

This should be solved with the next release.

[BillHally]

Thanks!