Use msvc in powershell script - Visual Studio 2019

build.ps1

$vswhere = 'C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe'
$vsfound = Test-Path $vswhere
if (-Not $vsfound) {
    Write-Host "vswhere not found in $vswhere"
    Exit 1
}
$vspath = & $vswhere -property installationPath
Write-Host "vspath = $vspath"
Push-Location "$vspath\Common7\Tools"
cmd /c "VsDevCmd.bat&set" | Foreach {
  if ($_ -match "=") {
    $v = $_.split("="); set-item -force -path "ENV:\$($v[0])"  -value "$($v[1])"
  }
}
Pop-Location

cl.exe hello-world.c

cf https://stackoverflow.com/questions/2124753/how-can-i-use-powershell-with-the-visual-studio-command-prompt