This option affects the DepDIR variable and allows the user to specify a target directory where the Make dependency file(s) will be stored; by default this variable is empty and dependency file(s) are created in the current working directory. This value is ignored if the Fd option was used to explicitly name the dependency file, and the name included absolute or relative path information.
If the value specified in this option is anything other than an unadorned drive letter (for example, D:) or a string ending with a path separator character (/ or \), then the path separator character appropriate for the underlying operating system is appended to the string.
┌────┬──────┬─────┬────┬──────────────────────────────────────────────────┐ │Type│Global│Group│File│Default │ ├────┼──────┼─────┼────┼──────────────────────────────────────────────────┤ │P │Yes │Yes │Yes │-Fdd:<DepDIR> │ └────┴──────┴─────┴────┴──────────────────────────────────────────────────┘