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Re:Show HN: xocc – C compiler based on BSD license by zzo38computer on Sunday March 21, 2021 @03:30PM (#26533151)
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?

Re:Show HN: xocc – C compiler based on BSD license by steven_known on Monday March 22, 2021 @04:24AM (#26538099)
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.
Re:Show HN: xocc – C compiler based on BSD license by steven_known on Monday March 22, 2021 @04:26AM (#26538106)
For now, xocc supports C99, but does not support GNU extensions yet.