Is `-isystem` a POSIX cc option?

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 c99 instead of c89, 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 has c99

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.

posted 25 days ago

CC BY-SA 4.0

InfiniteDissent‭

199 reputation 0 5 19 1