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To use this StackExchange answer as a starting point, the latest POSIX standard does not specify a cc command at all:
POSIX 1003.1-2001 (Single Unix v3) specifies
c99instead ofc89, to use an updated standard dialect of C. You can see some editorial traces left from a draft that included a cc utility as well, but cc was removed from the specification. POSIX 1003.1-2008 (Single Unix v4) again just hasc99
So you can't rely on the existence of a cc command, much less its options.
If we look at what the latest POSIX actually says about the c99 command, there is no reference to an -isystem option.
So I think the answer to your question is no. If you want to rely strictly on POSIX-mandated compiler options, you cannot use -isystem.
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