Prevent illegal macro names being generated #5
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* Source filenames can contain characters illegal in C/C++ identifiers. Prevent illegal macro names being generated by replacing illegal characters by underscores. * Also, C identifiers should not start with a digit, so prepend an underscore if a leading digit is seen.
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Source filenames can contain characters illegal in C/C++ identifiers. Prevent illegal macro names being generated by replacing all characters not allowed in an identifier with underscores.