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Only set DOTNET_HOST_PATH if something was installed #80842

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Merged
dibarbet merged 1 commit into from
Oct 22, 2025
Merged

Only set DOTNET_HOST_PATH if something was installed #80842

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22 changes: 13 additions & 9 deletions eng/build.ps1
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Original file line number Diff line number Diff line change
Expand Up @@ -734,15 +734,6 @@ try {

Push-Location $RepoRoot

# Workaround for DOTNET_HOST_PATH not being set by older MSBuild
# Removal is tracked by https://github.com/dotnet/roslyn/issues/80742
if (-not $env:DOTNET_HOST_PATH) {
$env:DOTNET_HOST_PATH = Join-Path (Join-Path $RepoRoot '.dotnet') 'dotnet'
if (-not (Test-Path $env:DOTNET_HOST_PATH)) {
$env:DOTNET_HOST_PATH = "$($env:DOTNET_HOST_PATH).exe"
}
}

Subst-TempDir

if ($ci) {
Expand All @@ -759,6 +750,19 @@ try {
&(Ensure-DotNetSdk) tool restore
}

# Above InitializeDotNetCli or Ensure-DotNetSdk may have installed a local .NET SDK.
# $global:_DotNetInstallDir will point to the correct global or local SDK location.
# We need to make sure DOTNET_HOST_PATH points to that SDK as a workaround for older MSBuild
# which will not set it correctly. Removal is tracked by https://github.com/dotnet/roslyn/issues/80742
if (-not $env:DOTNET_HOST_PATH -and (Test-Path variable:global:_DotNetInstallDir)) {
$env:DOTNET_HOST_PATH = Join-Path $global:_DotNetInstallDir 'dotnet'
if (-not (Test-Path $env:DOTNET_HOST_PATH)) {
$env:DOTNET_HOST_PATH = "$($env:DOTNET_HOST_PATH).exe"
}

Write-Host "Setting DOTNET_HOST_PATH to $env:DOTNET_HOST_PATH"
}

if ($bootstrap -and $bootstrapDir -eq "") {
Write-Host "Building bootstrap Compiler"
$bootstrapDir = Join-Path (Join-Path $ArtifactsDir "bootstrap") "build"
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