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: 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:
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