The mono_marshal_ilgen_init symbol is private in libmonosgen-2.0.dylib

[rolfbjarne]

Description

In xamarin-macios, when the interpreter is enabled, we call mono_marshal_ilgen_init from the main method:

https://github.com/xamarin/xamarin-macios/blob/c55fbdfef95028ba03d0f7a35aebca03bd76f852/tools/common/Target.cs#L747

However, marshal-ilgen was recently made into a component, which looks like made this symbol private in libmonosgen-2.0.dylib:

$ nm dotnet-sdk-7.0.100-rc.1.22424.1/packs/Microsoft.NETCore.App.Runtime.Mono.maccatalyst-x64/7.0.0-rc.1.22423.4/runtimes/maccatalyst-x64/native/libmonosgen-2.0.dylib | g _mono_component_hot_reload_init
00000000002b4880 t _mono_component_hot_reload_init

This breaks the build for apps that have the interpreter enabled:

packs/Microsoft.MacCatalyst.Sdk/15.4.1010-rc.1/targets/Xamarin.Shared.Sdk.targets(1221,3): error : Undefined symbols for architecture x86_64: [/Users/rolf/work/maccore/net7.0/xamarin-macios/tests/dotnet/MySimpleApp/MacCatalyst/MySimpleApp.csproj]
packs/Microsoft.MacCatalyst.Sdk/15.4.1010-rc.1/targets/Xamarin.Shared.Sdk.targets(1221,3): error :   "_mono_marshal_ilgen_init", refere [/Users/rolf/work/maccore/net7.0/xamarin-macios/tests/dotnet/MySimpleApp/MacCatalyst/MySimpleApp.csproj]

Reproduction Steps

See description

Expected behavior

See description

Actual behavior

See description

Regression?

No response

Known Workarounds

No response

Configuration

No response

Other information

No response

[rolfbjarne]

CC @naricc @steveisok @akoeplinger

Tagging subscribers to 'os-maccatalyst': @steveisok, @akoeplinger
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Issue Details

---

Description

In xamarin-macios, when the interpreter is enabled, we call mono_marshal_ilgen_init from the main method:

https://github.com/xamarin/xamarin-macios/blob/c55fbdfef95028ba03d0f7a35aebca03bd76f852/tools/common/Target.cs#L747

However, marshal-ilgen was recently made into a component, which looks like made this symbol private in libmonosgen-2.0.dylib:

$ nm dotnet-sdk-7.0.100-rc.1.22424.1/packs/Microsoft.NETCore.App.Runtime.Mono.maccatalyst-x64/7.0.0-rc.1.22423.4/runtimes/maccatalyst-x64/native/libmonosgen-2.0.dylib | g _mono_component_hot_reload_init
00000000002b4880 t _mono_component_hot_reload_init

This breaks the build for apps that have the interpreter enabled:

packs/Microsoft.MacCatalyst.Sdk/15.4.1010-rc.1/targets/Xamarin.Shared.Sdk.targets(1221,3): error : Undefined symbols for architecture x86_64: [/Users/rolf/work/maccore/net7.0/xamarin-macios/tests/dotnet/MySimpleApp/MacCatalyst/MySimpleApp.csproj]
packs/Microsoft.MacCatalyst.Sdk/15.4.1010-rc.1/targets/Xamarin.Shared.Sdk.targets(1221,3): error :   "_mono_marshal_ilgen_init", refere [/Users/rolf/work/maccore/net7.0/xamarin-macios/tests/dotnet/MySimpleApp/MacCatalyst/MySimpleApp.csproj]

Reproduction Steps

See description

Expected behavior

See description

Actual behavior

See description

Regression?

No response

Known Workarounds

No response

Configuration

No response

Other information

No response

Author:	rolfbjarne
Assignees:	naricc
Labels:	blocking-release, area-Build-mono, os-maccatalyst
Milestone:	7.0.0

[lambdageek]

mono_marshal_ilgen_init is not defined in libmonosgen-2.0.dylib at all. it's defined in the marshaling component now.

@naricc we need to put it back in libmonosgen. (I suggest making a new symbol for the function in the component API - or better yet call it internally in mono through the ilgen component interface)

[naricc]

Working on a fix now.

[lambdageek]

@rolfbjarne Can you try this:

https://github.com/xamarin/xamarin-macios/blob/c55fbdfef95028ba03d0f7a35aebca03bd76f852/tools/common/Target.cs#L772

#if !NET
				sw.WriteLine ("\tmono_marshal_ilgen_init ();");
#endif

I think mono_marshal_ilgen_init will get called on-demand now the first time marshaling is needed...