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I looked, and cannot find any documentation (other than a few comments in the source code).

Is there any documentation of the IR codes?

Also, what version of C does the C compiler implement, and are any GNU extensions implemented?

Sorry for the inconvenience caused by documents. There is Manual.txt under xoc/doc/ that describes key concepts to XOC IR, Var, MD, etc.We will do our best to supplement documents.

For now, xocc supports C99, but does not support GNU extensions yet.

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