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31d70cb1e1
flush() must not do anything more than necessary. Determining the type of input files must be done only once, before flush. Fortunately, we don't even need any file system accesses to do this since that information is statically known in most cases, and in the rest of the cases can be determined by file extension alone. This commit also updates the nearby code to conform to the convention for error handling where there is exactly one error code to represent the fact that error messages have already been emitted. This had the side effect of improving the error message for a linker script parse error. "positionals" is not a linker concept; it is a command line interface concept. Zig's linker implementation should not mention "positionals". This commit deletes that array list in favor of directly making function calls, eliminating that heap allocation during flush().