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Interpretation when omitted

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This option specifies the folder to save a preprocessed C source file generated by specifying the -P option as path.

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If an existing folder is specified as path, the preprocessed C source file is saved under the C source file name with the extension replaced by ".i" to path.
An error will occur if a nonexistent folder is specified.

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An existing file can be specified as path.
If one preprocessed C source file is output, it will be saved with path as the file name.
If two or more preprocessed C source files are output, an error will occur.
An error will occur if a nonexistent file is specified.

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If "=path" is omitted, the preprocessed C source file is saved under the C source file name with the extension replaced by ".i".

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If two or more files with the same name (even if they are in different folders) are specified as source files, then a warning is output, and a preprocessed C source file is only saved for the last source file to be specified.

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To save the preprocessed C source file to folder "D:\sample", describe as: