[mono] Allow missing assemblies in llvmonly+interp mode.

[vargaz]

Part of the fix for #51961.

[vargaz]

A downside of this is that it would also ignore issues when there is a mismatch between assemblies and AOT images.

[directhex]

Do we want a different approach without that downside? A way to encode a permitted list of missing assemblies, as opposed to just being more chill about them in general?

[lambdageek]

A downside of this is that it would also ignore issues when there is a mismatch between assemblies and AOT images.

Can we raise the log level from these two trace calls to a warning?

runtime/src/mono/mono/mini/aot-runtime.c

Lines 327 to 337 in 33940e6

	mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_AOT, "AOT: module %s is unusable because dependency %s is not found.", amodule->aot_name, amodule->image_names [index].name);
	mono_error_set_bad_image_by_name (error, amodule->aot_name, "module '%s' is unusable because dependency %s is not found (error %d).\n", amodule->aot_name, amodule->image_names [index].name, status);
	amodule->out_of_date= TRUE;
	returnNULL;
	}
	if (strcmp (assembly->image->guid, amodule->image_guids [index])) {
	mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_AOT, "AOT: module %s is unusable (GUID of dependent assembly %s doesn't match (expected '%s', got '%s')).", amodule->aot_name, amodule->image_names [index].name, amodule->image_guids [index], assembly->image->guid);
	mono_error_set_bad_image_by_name (error, amodule->aot_name, "module '%s' is unusable (GUID of dependent assembly %s doesn't match (expected '%s', got '%s')).", amodule->aot_name, amodule->image_names [index].name, amodule->image_guids [index], assembly->image->guid);
	amodule->out_of_date= TRUE;
	returnNULL;

[vargaz]

An alternative would be to emit the aot image, but don't actually emit any code in it.

[lewing]

I'm fine with this for now, if there are objections lets discuss them.

[radical]

/azp run runtime-extra-platforms

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[radical]

/azp run runtime-extra-platforms

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).