How do you get KUDU to use MSBuild 15

Question

Microsoft.Net.Compilers is only supported on MSBuild v15.0 and above

whatever the auto detect tooling is for KUDU, it always selects 14

is

Answer 1

Add an app-setting for your Web App:

MSBUILD_PATH with the value %MSBUILD_15_DIR%\msbuild.exe

This will be picked up by the default deploy script.

Answer 2

msbuild 15 is not used by default. You can use it, with a little modification to your Kudu script.

Here is an example using msbuild 15 for restore, build and publish*.

:: 1. Restore nuget packages
call :ExecuteCmd nuget.exe restore "%DEPLOYMENT_SOURCE%\BACON.sln" -MSBuildPath "%MSBUILD_15_DIR%"
IF !ERRORLEVEL! NEQ 0 goto error

:: 2. Build and publish
call :ExecuteCmd "%MSBUILD_15_DIR%\MSBuild.exe" "%DEPLOYMENT_SOURCE%\BACON.WEB.csproj" /p:DeployOnBuild=true /p:configuration=Release /p:publishurl="%DEPLOYMENT_TEMP%" %SCM_BUILD_ARGS%
IF !ERRORLEVEL! NEQ 0 goto error

* change BACON.sln & BACON.WEB.csproj to your project file names

Answer 3

The msbuild 15 is now available in Azure, however it's not default you need to add a custom deployment script to override Kudu's project detection logic .

As watashiSHUN described you could add something like this:

nuget restore "%DEPLOYMENT_SOURCE%\{SolutionPath}"
"%MSBUILD_PATH%" {MSBuildArguments}

And here is the template and the issue in the github.