The default language standard of the C Node compiler is GNU89. GNU89 is the C89 specification with GNU extensions (some C99 features) supported. However, the C Node does not support the following features:
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Function definitions and declarations
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Third-party libraries (#include directive is not supported)
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extern and static variables
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Standard input
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Standard output, except for cnode_printf
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return statement
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exit, atexit, abort, signal, and raise ANSI C functions
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Thread creation