Re:

"compilation unit" is a C standard term. It typically boils down
to "single .c file".

As you mentioned later, "single .c file with all the other files (headers
or other .c files) that it pulls in via #include" is actually "translation
unit", both in the C standard as well as gcc docs.

Yeah. "single .c file after preprocessing". Same thing :-)

"Compilation unit"
doesn't seem to be nearly as standard a term, though in most places it
is indeed meant to be same as "translation unit", but with the new gcc
inter-module-analysis stuff that you referred to above, I suspect one may
reasonably want to call a "compilation unit" as all that the compiler sees
at a given instant.

That would be a bit confusing, would it not? They'd better find
some better name for that if they want to name it at all (remember,
none of these optimisations should have any effect on the semantics
of the program, you just get fewer .o files etc.).


Segher

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