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Re: Don't claim GCC predefines __POSIX__

   >> How do you test that you are on a POSIX compliant system?
   >
   > Practically, run autoconf tests for the features you care about,
   > which are unlikely to be 100% conformance. ?For 100% conformance,
   > run a conformance testsuite - or if anyone does POSIX
   > certification, look at a list of certified systems.

   I fully understand the complexity of saying a system is or is not
   fully POSIX is not trivially detectable by the compiler.

One can get quite far by checking for __POSIX_VERSION__ as well if
using autoconf tests is to heavy.
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