--pch_messages
--no_pch_messages
This option enables or disables the display of messages indicating that a PCH file is used in the current compilation.
The default is --pch_messages.
--create_pch=filename
--pch
--pch_dir=dir
--pch_verbose, --no_pch_verbose
--use_pch=filename
#pragma hdrstop
#pragma no_pch
PreCompiled Header (PCH) files in Using the Compiler.