/Yc (Create Precompiled Header File)
This option instructs the compiler to create a precompiled header (.pch) file that represents the state of compilation at a certain point.
|/Yc||The compiler compiles all code up to the end of the base source file, or to the point in the base file where a #pragma hdrstop occurs.
The resulting .pch file has the same base name as your base source file unless you specify a different file name using the hdrstop pragma or the /Fp option.
|/Ycfilename||The compiler compiles all code up to and including the .h file specified in filename.|
The precompiled code is saved in a file with a name created from the base name of the file specified with the /Yc option and a .pch extension. You can also use the /Fp option to specify a name for the precompiled header file.
If you use /Ycfilename (Through Header), the compiler compiles all code up to and including the specified file for subsequent use with the /Yu option.
Note If the options /Ycfilename and /Yufilename occur on the same command line and both reference, or imply, the same file name, /Ycfilename takes precedence. This feature simplifies the writing of makefiles.
Use /YX to instruct the compiler to use a precompiled header file (PCH) if one exists or to create one if none exists.
For more information on precompiled headers, see:
To set this compiler option in the Visual Studio development environment
- Open the project's Property Pages dialog box. For details, see Setting Visual C++ Project Properties.
- Click the C/C++ folder.
- Click the Precompiled Headers property page.
- Modify the Create/Use PCH Through File property or the Create/Use Precompiled Header property.
To set this compiler option programmatically
Consider the following code:
#include <afxwin.h> // Include header for class library #include "resource.h" // Include resource definitions #include "myapp.h" // Include information specific to this app ...
When this code is compiled with the command:
CL /YcMYAPP.H PROG.CPP
the compiler saves all the preprocessing for AFXWIN.h, RESOURCE.h, and MYAPP.h in a precompiled header file called MYAPP.pch.