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Here are some things to be aware of when using the traditional preprocessor.
#
’ appears in the first column. There can be no whitespace between the beginning of the line and the ‘#
’, but whitespace can follow the ‘#
’.#error
’ or ‘#pragma
’, and may not recognize ‘#elif
’. CPP supports all the directives in traditional mode that it supports in ISO mode, including extensions, with the exception that the effects of ‘#pragma GCC poison
’ are undefined.