Share via

Sample Makefile for PCH


The latest version of this topic can be found at Sample Makefile for PCH.

The following makefile uses macros and an !IF, !ELSE, !ENDIF flow-of-control command structure to simplify its adaptation to your project.

# Makefile : Illustrates the effective use of precompiled  
#            headers in a project  
# Usage:     NMAKE option  
# option:    DEBUG=[0|1]  
#            (DEBUG not defined is equivalent to DEBUG=0)  
OBJS = myapp.obj applib.obj  
# List all stable header files in the STABLEHDRS macro.  
STABLEHDRS = stable.h another.h  
# List the final header file to be precompiled here:  
BOUNDRY = stable.h  
# List header files under development here:  
UNSTABLEHDRS = unstable.h  
# List all compiler options common to both debug and final  
# versions of your code here:  
CLFLAGS = /c /W3  
# List all linker options common to both debug and final  
# versions of your code here:  
!IF "$(DEBUG)" == "1"  
CLFLAGS   = /D_DEBUG $(CLFLAGS) /Od /Zi /f  
LIBS      = slibce  
CLFLAGS   = $(CLFLAGS) /Oselg /Gs  
LIBS      = slibce  
myapp.exe: $(OBJS)  
    link $(LINKFLAGS) @<<  
$(OBJS), myapp, NUL, $(LIBS), NUL;  
# Compile myapp  
myapp.obj  : myapp.cpp $(UNSTABLEHDRS)  stable.pch  
    $(CPP) $(CLFLAGS) /Yu$(BOUNDRY)    myapp.cpp  
# Compile applib  
applib.obj : applib.cpp $(UNSTABLEHDRS) stable.pch  
    $(CPP) $(CLFLAGS) /Yu$(BOUNDRY)    applib.cpp  
# Compile headers  
stable.pch : $(STABLEHDRS)  
    $(CPP) $(CLFLAGS) /Yc$(BOUNDRY)    applib.cpp myapp.cpp  

Aside from the STABLEHDRS, BOUNDRY, and UNSTABLEHDRS macros shown in the figure "Structure of a Makefile That Uses a Precompiled Header File" in PCH Files in the Build Process, this makefile provides a CLFLAGS macro and a LINKFLAGS macro. You must use these macros to list compiler and linker options that apply whether you build a debug or final version of the application's executable file. There is also a LIBS macro where you list the libraries your project requires.

The makefile also uses !IF, !ELSE, !ENDIF to detect whether you define a DEBUG symbol on the NMAKE command line:


This feature makes it possible for you to use the same makefile during development and for the final versions of your program — use DEBUG=0 for the final versions. The following command lines are equivalent:


For more information on makefiles, see NMAKE Reference. Also see Compiler Options and the Linker Options.

See Also

Using Precompiled Headers in a Project