How do I make a flash library that can be either compiled in or loaded at runtime?

I'm looking to make a library that can be either merged into a swf at compile time or loaded into a swf at runtime. The way I understand it, .swc fil开发者_开发知识库es are generally merged into a swf at compile time, and .swf files are generally loaded into a swf at runtime. Is there a way I can have one file that can do both?

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You could try using authortime shared libraries.
Basically you would have an FLA that has the shared animation in a MovieClip. You could build this clip separately as a SWF and use that for any files that need to load it at runtime.

Then, in any other projects that need the clip to be compiled in, you'll create a new MovieClip in that project and link it to the shared clip in the other FLA.
In the Symbol Properties, hit Browse at the bottom in the Source section and navigate to the FLA and then the shared clip. Tick 'Always update before publish'.

Now, if you make changes to shared clip, you'll recompile the SWF that gets loaded, and recompile any of the other projects that use that shared asset. They should automatically import the newest version when they get built.

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What are you trying to do? What is the "library" supposed to do or provide? If it's an animation, you can drop it in the IDE and have it compiled in (as opposed to loaded at runtime). If it's code, it's nonsensical to load it at runtime.