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:
LINKFLAGS = /NOD /ONERROR:NOEXE
!IF "$(DEBUG)" == "1"
CLFLAGS = /D_DEBUG $(CLFLAGS) /Od /Zi /f
LINKFLAGS = $(LINKFLAGS) /COD
LIBS = slibce
!ELSE
CLFLAGS = $(CLFLAGS) /Oselg /Gs
LINKFLAGS = $(LINKFLAGS)
LIBS = slibce
!ENDIF
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:
NMAKE DEBUG=[1|0]
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:
NMAKE
NMAKE DEBUG=0
For more information on makefiles, see NMAKE Reference. Also see Compiler Options and the Linker Options.