2.6.4 Dependence between options
The behavior of the following options varies depending on what other options are specified.
-preprocess
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This option will be invalid if the -P option is not specified at the same time.
At this time, a warning will not be output.
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-o
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If the -P, -S, or -c option is specified at the same time, then the generated file types will be a preprocessed file, assembly source file, or object file.
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-g
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If the -O option is specified at the same time, debug information may not be output in source line units due to optimization effects.
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-Oinline_level
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If this option is specified at the same time with the -merge_files option, inline expansion may be performed between files.
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