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Random standard-conforming known things that should be added to pcc: - Currently no known usable C99 stuff is not added. Other stuff that are for compatibility: - Support empty initializers. Not allowed by C99, but some people use it since gcc accept it. - Support unnamed unions. Not allowed by C99, but people sometimes tend to use it. Internal cleanups: - Cleanup prototype parsing and checking. - Ensure that the instruction matcher do not assume that it will reclaim a register if a direct match of something else than a register is done as a leg node. This may require additions to visit and su fields in table and node. - Teach the register allocator how to allocate multiple registers at once. This is not the same as register pairs; pairing is handled as a separate register class. This is used for example when a type is not supported by the underlying hardware, like long long on i386 or long on pdp11. GCC compatibility: - PCC has GCC compatibility enabled by default, but there are a number of language constructs that may not be fully implemented, like attributes. - There's similar work needed in the C preprocessor area. #pragmas are the first thing that comes to mind.
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