From: Jason Green <news AT jgreen4 DOT fsnet DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Generic makefile! (Re: Reverse-compiler)
Date: Thu, 06 Apr 2000 00:28:28 +0100
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Jonathan Meunier <jonathanm AT corel DOT com> wrote:

> Make knows how to compile C files, but is there any easy way to make it
> compile C++ files? 

Sure, there are built in rules for C++ too.  :-)

> What I'm doing right now is this:
> 
> CC = gpp
> CFLAGS = -Wall -O3

The C++ rules use different variables:

CXX = gpp
CXXFLAGS = -Wall -O3
LDFLAGS = -g  # Linker flags (see below)

> 
> OBJS = file1.o file2.o
> HEADS = file1.h file2.h
> 
> file.exe: $(OBJS)
> 	$(CC) $(CFLAGS) -o $@ $(OBJS)

You shouldn't need CFLAGS for linking (AFAIK).  Normally the linker
flags are set with LDFLAGS.  And you can simplify the command too:

file: $(OBJS)
	$(CXX) $(LDFLAGS) -o $@ $^

> file1.o: $(HEADS)
> 	$(CC) $(CFLAGS) -c file1.cpp
> file2.o: $(HEADS)
> 	$(CC) $(CFLAGS) -c file2.cpp

Omit the command lines if you want to use the built in commands:

file1.o: $(HEADS)
file2.o: $(HEADS)

> 
> This gets very long in big projects.. :\  There must be a way to simply
> tell make to take each .cpp file and compile them with gpp with those
> flags.

Hopefully the above will do what you want.  But you can make life even
easier if you get the compiler to create dependency files for you,
that way you don't have to worry about the headers. 

CXX = gpp
CXXFLAGS = -Wall -O3  # C++ Compiler flags
LDFLAGS = -g          # Linker flags

OBJS = file1.o file2.o

file: $(OBJS)
	$(CXX) $(LDFLAGS) -o $@ $^

CPPFLAGS += -MMD      # Pre-Processor flags
-include $(OBJS:.o=.d)