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Interpretation when omitted

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This option merges two or more C source files and compiles them. And then it outputs one file.

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If the -o option is specified, then the specified file name is used for the output file. If the -o option is not specified, then the file name is in accordance with the interpretation of the -o option being omitted for the initially specified C source file.

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If one C source file is input and if this option is specified together with the -P option, this option will be invalid.

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If this option is specified at the same time as the -S or -c option, then for the 2nd and subsequent C source files that are specified, an empty file is output in accordance with the interpretation that the -o option was omitted.

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If this option is specified at the same time with the -Oinline option, inline expansion is performed between files.

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Operation is not guaranteed if an object file is generated with this option specified and any of link options -delete, -rename, and -replace is specified at linkage of the object file.

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To merge main.c and sub.c, compile them, and output one file, describe as: