Precompiling failed error after enabling LLVM on Android release builds

[phillipturner]

Description

Unable to run Android release builds after enabling LLVM

Steps to Reproduce

1. Create a new MAUI project
2. Enable the option to Use LLVM optimising compiler for Release & net8.0-android
3. Run release build for Android

Link to public reproduction project repository

https://github.com/phillipjt/maui-reproductions/tree/llvm-precompiling-failed

Version with bug

8.0.0-preview.7.8842

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

7.0.86

Affected platforms

Android

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

1>[_Microsoft.Android.Resource.Designer.dll] Exec (with response file contents expanded) in C:\Repositories\maui-reproductions\SampleApp\SampleApp: MONO_PATH=C:\Repositories\maui-reproductions\SampleApp\SampleApp\obj\Release\net8.0-android\android-arm\linked; MONO_ENV_OPTIONS= C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.android-arm\8.0.0-preview.7.23375.6\Sdk\..\tools\mono-aot-cross.exe --debug --llvm "--aot=asmwriter,temp-path=obj\Release\net8.0-android\android-arm\aot\armeabi-v7a\_Microsoft.Android.Resource.Designer,profile-only,profile=C:\Nuget\microsoft.maui.controls.build.tasks\8.0.0-preview.7.8842\buildTransitive\netstandard2.0\maui.aotprofile,profile=C:\Nuget\microsoft.maui.controls.build.tasks\8.0.0-preview.7.8842\buildTransitive\netstandard2.0\maui-blazor.aotprofile,nodebug,llvm-path=C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.android-arm\8.0.0-preview.7.23375.6\Sdk\..\tools,mtriple=armv7-linux-gnueabi,tool-prefix=C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\tools\binutils\bin\arm-linux-androideabi-,outfile=obj\Release\net8.0-android\android-arm\aot\_Microsoft.Android.Resource.Designer.dll.so,llvm-outfile=obj\Release\net8.0-android\android-arm\aot\_Microsoft.Android.Resource.Designer.dll-llvm.o,temp-path=obj\Release\net8.0-android\android-arm\_Microsoft.Android.Resource.Designer.dll.tmp,ld-name=ld,ld-flags=\"C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\tools\libstubs\android-arm\libc.so\";\"C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\tools\libstubs\android-arm\libm.so\" --no-relax -s" "obj\Release\net8.0-android\android-arm\linked\_Microsoft.Android.Resource.Designer.dll"
1>C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\targets\Microsoft.Android.Sdk.Aot.targets(109,5): error : Precompiling failed for C:\Repositories\maui-reproductions\SampleApp\SampleApp\obj\Release\net8.0-android\android-arm\linked\_Microsoft.Android.Resource.Designer.dll with exit code 1.
1>C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\targets\Microsoft.Android.Sdk.Aot.targets(109,5): error : The system cannot find the file specified.
1>C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\targets\Microsoft.Android.Sdk.Aot.targets(109,5): error : AOT of image C:\Repositories\maui-reproductions\SampleApp\SampleApp\obj\Release\net8.0-android\android-arm\linked\_Microsoft.Android.Resource.Designer.dll failed.
1>C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\targets\Microsoft.Android.Sdk.Aot.targets(109,5): error : Mono Ahead of Time compiler - compiling assembly C:\Repositories\maui-reproductions\SampleApp\SampleApp\obj\Release\net8.0-android\android-arm\linked\_Microsoft.Android.Resource.Designer.dll
1>C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\targets\Microsoft.Android.Sdk.Aot.targets(109,5): error : AOTID 40A9BA1C-82AE-5CB2-92C4-E5B57ED51BDA
1>C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\targets\Microsoft.Android.Sdk.Aot.targets(109,5): error : Using profile data file 'C:\Nuget\microsoft.maui.controls.build.tasks\8.0.0-preview.7.8842\buildTransitive\netstandard2.0\maui.aotprofile'
1>C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\targets\Microsoft.Android.Sdk.Aot.targets(109,5): error : Using profile data file 'C:\Nuget\microsoft.maui.controls.build.tasks\8.0.0-preview.7.8842\buildTransitive\netstandard2.0\maui-blazor.aotprofile'
1>C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\targets\Microsoft.Android.Sdk.Aot.targets(109,5): error : Added 0 methods from profile.
1>C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\targets\Microsoft.Android.Sdk.Aot.targets(109,5): error : Added 0 methods from profile.
1>C:\Program Files\dotnet\packs\Microsoft.Android.Sdk.Windows\34.0.0-preview.7.382\targets\Microsoft.Android.Sdk.Aot.targets(109,5): error : Executing opt: "C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.android-arm\8.0.0-preview.7.23375.6\Sdk\..\tools\opt" -f -disable-tail-calls -passes='default<O2>,place-safepoints' -spp-all-backedges -o "obj\Release\net8.0-android\android-arm\_Microsoft.Android.Resource.Designer.dll.tmp\temp.opt.bc" "obj\Release\net8.0-android\android-arm\_Microsoft.Android.Resource.Designer.dll.tmp\temp.bc"

[pulmuone]

same issue

[XamlTest]

Verified this on Visual Studio Enterprise 17.8.0 Preview 1.0. Repro on Android 13.0-API33(8.0.0-preview.7.8842), not repro on Windows 11 with below Project:
SampleApp.zip

[samhouts]

@dellis1972?

[dellis1972]

Hmm

this command

 "C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Runtime.AOT.win-x64.Cross.android-arm64\8.0.0-preview.7.23375.6\Sdk\..\tools\opt" -f -disable-tail-calls -passes='default<O2>,place-safepoints' -spp-all-backedges -o "obj\Release\net8.0-android\android-arm64\Microsoft.Extensions.DependencyInjection.dll.tmp\temp.opt.bc" "obj\Release\net8.0-android\android-arm64\Microsoft.Extensions.DependencyInjection.dll.tmp\temp.bc"

is failing becuase temp.opt.bc does not exist. temp.bc and temp.s do however.
This looks more like an issue in the Aot compiler side I think.

[SamMonoRT]

@directhex @fanyang-mono @jonathanpeppers - any insights ?

[directhex]

Looks like mono-aot-cross.exe failed, which is why opt couldn't find the intermediate file it produced?

[steveisok]

@directhex could it be that we are running Sdk\..\tools\opt instead of Sdk\..\tools\opt.exe ?

[directhex]

Seems the problem is it's trying to execute opt not opt.exe - that's not valid for Windows. We need to explicitly use the .exe app names on Windows.