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Instead of treating them as OSes, we treat them as their own category. This is modeled on what LLVM does with its `ObjectFormatType` enum [1], advancing my long-running project of trying to nudge GNU config and LLVM towards each other, taking the best ideas of both. Currently, my emphasis is just on code cleanup. There are just a few tests for newly supported changes that fall out of this. But down the road, this also opens the door to parsing configs with more than 4 components, like [2]. [1]: https://llvm.org/doxygen/classllvm_1_1Triple.html#a83e907e55fa50e093caa96a0aff96201 [2]:a18266473b/llvm/unittests/TargetParser/TripleTest.cpp (L1873C50-L1873C77)added in28b82bc39e* config.sub: Save machine code format name separately from the OS name. * doc/config.sub.1: Regenerate. * testsuite/config-sub.data (arm-unknown-none-aout, arm-unknown-none-pe): New entries. Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>