`PublishAot` and `NoWarn` (sometimes) breaks `dotnet publish`

[pyrrho]

Describe the bug

dotnet publish fails when <PublishAot> is set to true and <NoWarn> includes newlines.

To Reproduce

1. Create a new console application
   dotnet new console -n AoTNoWarn

2. Update the AoTNoWarn.csproj to match the below, specifically the second property group

   <Project Sdk="Microsoft.NET.Sdk">
   
     <PropertyGroup>
       <OutputType>Exe</OutputType>
       <TargetFramework>net7.0</TargetFramework>
       <ImplicitUsings>enable</ImplicitUsings>
       <Nullable>enable</Nullable>
     </PropertyGroup>
   
     <PropertyGroup>
       <PublishAot>true</PublishAot>
       <!-- These for demonstration purposes. Don't disable the 'Division by constant zero' error. -->
       <NoWarn>
         CS0020,
         CS0021,
       </NoWarn>
     </PropertyGroup>
   
   </Project>
   

3. Run dotnet publish

Exceptions (if any)

The exception I see is

EXEC : error : No files matching CS0021, [/path/to/AoTNoWarn/AoTNoWarn.csproj]

I read this as implying the compiler invocation is being constructed in such a way that <NoWarn> options after a newline are being read as files to compile, rather than --nowarn option arguments.

Further discussion

Running dotnet publish --verbosity diag is helpful for tracking down the source of the issue;

10:21:55.965   1:7>Target "IlcCompile: (TargetId:179)" in file "/home/drew/.dotnet/sdk/7.0.102/Sdks/Microsoft.DotNet.ILCompiler/build/Microsoft.NETCore.Native.targets" from project "/path/to/AoTNoWarn/AoTNoWarn.csproj" (target "LinkNative" depends on it):
                   Building target "IlcCompile" completely.
                   Output file "obj/Debug/net7.0/linux-x64/native/AoTNoWarn.o" does not exist.
                   Task "Message" (TaskId:118)
                     Task Parameter:Importance=high (TaskId:118)
                     Task Parameter:Text=Generating native code (TaskId:118)
                     Generating native code (TaskId:118)
                   Done executing task "Message". (TaskId:118)
                   Task "Exec" (TaskId:119)
                     Task Parameter:Command="/home/drew/.nuget/packages/runtime.linux-x64.microsoft.dotnet.ilcompiler/7.0.2/tools/ilc" @"obj/Debug/net7.0/linux-x64/native/AoTNoWarn.ilc.rsp" (TaskId:119)
                     "/home/drew/.nuget/packages/runtime.linux-x64.microsoft.dotnet.ilcompiler/7.0.2/tools/ilc" @"obj/Debug/net7.0/linux-x64/native/AoTNoWarn.ilc.rsp" (TaskId:119)
10:21:56.086   1:7>EXEC : error : No files matching CS0021, [/path/to/AoTNoWarn/AoTNoWarn.csproj]

Looking at the contents of /path/to/AoTNoWarn/obj/Debug/net7.0/linux-x64/native/AoTNoWarn.ilc.rsp, we can see (what I believe to be) the root of the problem:

--scanreflection
--nowarn:"
      CS0020,
      CS0021,
    ;IL2121;1701;1702"
--singlewarn
--root:obj/Debug/net7.0/linux-x64/AoTNoWarn.dll

If I remove the whitespace, and replace the --nowarn: value with "CS0020,CS0021,;IL2121;1701;1702" (no newlines, no spaces), I'm then able to successfully execute a manual run of /home/drew/.nuget/packages/runtime.linux-x64.microsoft.dotnet.ilcompiler/7.0.2/tools/ilc obj/Debug/net7.0/linux-x64/native/AoTNoWarn.ilc.rsp.

A Probably-Unrelated Thought

When trying to figure out why my build was failing, I also noticed that when running dotnet publish --no-build with <PublishAot>true</PublishAot> in my .csproj file, the --no-build option was ignored. I assume that is because I'm missing some set of compiler flags in my dotnet build invocation, but the behavior was surprising and disappointing.

Further technical details

$ dotnet --info

dotnet --info
.NET SDK:
 Version:   7.0.102
 Commit:    4bbdd14480

Runtime Environment:
 OS Name:     pop
 OS Version:  22.04
 OS Platform: Linux
 RID:         linux-x64
 Base Path:   /home/drew/.dotnet/sdk/7.0.102/

Host:
  Version:      7.0.2
  Architecture: x64
  Commit:       d037e070eb

.NET SDKs installed:
  3.1.419 [/home/drew/.dotnet/sdk]
  3.1.423 [/home/drew/.dotnet/sdk]
  6.0.103 [/home/drew/.dotnet/sdk]
  6.0.300 [/home/drew/.dotnet/sdk]
  6.0.301 [/home/drew/.dotnet/sdk]
  6.0.400 [/home/drew/.dotnet/sdk]
  6.0.401 [/home/drew/.dotnet/sdk]
  7.0.102 [/home/drew/.dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 3.1.25 [/home/drew/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.29 [/home/drew/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.1 [/home/drew/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.3 [/home/drew/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.5 [/home/drew/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.6 [/home/drew/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.8 [/home/drew/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.9 [/home/drew/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.2 [/home/drew/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 3.1.25 [/home/drew/.dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.29 [/home/drew/.dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.1 [/home/drew/.dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.3 [/home/drew/.dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.5 [/home/drew/.dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.6 [/home/drew/.dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.8 [/home/drew/.dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.9 [/home/drew/.dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.2 [/home/drew/.dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
  None

Environment variables:
  DOTNET_ROOT       [/home/drew/.dotnet]

global.json file:
  Not found