in build/DependencyHelper.cs [141:157]
public static List<string> GetRuntimeFallbacks(string rid)
{
if (rid == null)
{
throw new ArgumentNullException(nameof(rid));
}
RuntimeFallbacks fallbacks = DependencyContext.Default
.RuntimeGraph
.FirstOrDefault(f => string.Equals(f.Runtime, rid, StringComparison.OrdinalIgnoreCase))
?? GetDefaultRuntimeFallbacks(rid)
?? new RuntimeFallbacks("any");
var rids = new List<string> { fallbacks.Runtime };
rids.AddRange(fallbacks.Fallbacks);
return rids;
}