Automatically export '__managed__Main' when needed

[Sergio0694]

Overview

Follow up to #103504. This PR makes __managed__Main be automatically exported as well, and adds a unit test.

Note

See #103504 (comment)

[Sergio0694]

/usr/bin/ld: CMakeFiles/CustomMainWithStubExeNative.dir/CustomMainWithStubExeNative.cpp.o: in function `main':
/__w/1/s/src/tests/nativeaot/CustomMainWithStubExe/CustomMainWithStubExeNative.cpp:26: undefined reference to `IncrementExitCode'
/usr/bin/ld: /__w/1/s/src/tests/nativeaot/CustomMainWithStubExe/CustomMainWithStubExeNative.cpp:27: undefined reference to `__managed__Main'

Mmh I think I clearly got something wrong in that CMake list. Not really familiar with it to be honest 😅

[MichalStrehovsky]

Mmh I think I clearly got something wrong in that CMake list. Not really familiar with it to be honest 😅

This is linker complaining it doesn't know where to resolve the references. The test tree builds native components before managed components so there's nothing we can provide. I think the only option is to LoadLibrary/GetProcAddress here like the https://github.com/dotnet/runtime/tree/main/src/tests/nativeaot/SmokeTests/SharedLibrary test is doing.

[Sergio0694]

I included those changes but the tests are still failing:

Output:
        chmod: cannot access '/datadisks/disk1/work/A93309BA/w/9EBC0916/e/nativeaot/CustomMainWithStubExe/CustomMainWithStubExe//native/CustomMainWithStubExe': No such file or directory
        /datadisks/disk1/work/A93309BA/p/nativeaottest.sh: line 15: /datadisks/disk1/work/A93309BA/w/9EBC0916/e/nativeaot/CustomMainWithStubExe/CustomMainWithStubExe//native/CustomMainWithStubExe: No such file or directory

I'm probably missing something obvious, but I'm not really familiar with the test infra here. I could use a hint 😅

[Sergio0694]

@jkotas CI is green now 🎉

I think we're a little bit past the RC1 snap, do we need to go through some process to get this into .NET 9?

[jkotas]

/azp run runtime-nativeaot-outerloop

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jkotas]

This is a bug-fix level change.

[jkotas]

/azp run runtime-nativeaot-outerloop

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).