Use uname(3) to get platform name via POSIX API #144
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Since __unix__ implies POSIX, and even POSIX.1 included uname(3), we can simply ask a POSIX system what the system name is. While some compilers don't define __unix__ for some platforms (ie: clang on macOS), it appears that every platform that defines __unix__ at least has the POSIX unistd.h header.
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Despite the test no longer running, the return value was still checked by the test script.
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Since unix implies POSIX, and even POSIX.1 included uname(3), we can simply ask a POSIX system what the system name is.
While some compilers don't define unix for some platforms (ie: clang on macOS), it appears that every platform that defines unix at least has the POSIX unistd.h header.