[BCSharp]

This resolves issue 1 from #2126. As an effect, it makes -X NoAdaptiveCompilation work (meaning "compile always"). With this option, the code newer gets light-compiled to interpreter instructions, but straight to IL. (-X CompilationThreshold=0 does both light-compile and compile to IL on the very first call).

Note that -X NoAdaptiveCompilation covers the __main__ module (the initial script) and _frozen_importlib, which IronPython loads itself at startup. Modules imported by the script are still compiled adaptively, and so is code run through exec, eval or compile(). That covers StdLib as well as user modules.

[slozier]

Thanks! Looks good to me!

I guess this resolves #2126 ?

[BCSharp]

I guess this resolves #2126 ?

Not quite. There is still the open question whether -X NoAdaptiveCompilation should only apply to __main__ (like now) or to all modules. In the first case, the help printed on -h needs to be updated. In the second case, the code, and there are several ways of doing it.

I lean towards the latter; it will make this option work like other compilation options (in scope).