2.1.117. ‑‑use_pch=filename
This option instructs the compiler to use a PCH file with the specified filename as part of the current compilation.
This option takes precedence if you include ‑‑pch on the same command line.
--use_pch=filename
Where:
filenameis the PCH file to be used as part of the current compilation.
The effect of this option is negated if you include ‑‑create_pch=filename on the same command line.
If the specified file does not exist, or is not a valid PCH file, then the compiler generates an error.