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3. A sample Makefile

This Makefile is a fully functional sample for compiling several C sources (here foo.c and bar.c) and link the resulting object files into an executable program (here foobar):

SOURCES = foo.c bar.c

PROGRAM = foobar

ifdef CC65_TARGET
CC      = $(CC65_HOME)/bin/cl65
CFLAGS  = -t $(CC65_TARGET) --create-dep $(<:.c=.d) -O
LDFLAGS = -t $(CC65_TARGET) -m $(PROGRAM).map
else
CC      = gcc
CFLAGS  = -MMD -MP -O
LDFLAGS = -Wl,-Map,$(PROGRAM).map
endif

########################################

.SUFFIXES:
.PHONY: all clean
all: $(PROGRAM)

ifneq ($(MAKECMDGOALS),clean)
-include $(SOURCES:.c=.d)
endif

%.o: %.c
        $(CC) -c $(CFLAGS) -o $@ $<

$(PROGRAM): $(SOURCES:.c=.o)
        $(CC) $(LDFLAGS) -o $@ $^

clean:
        $(RM) $(SOURCES:.c=.o) $(SOURCES:.c=.d) $(PROGRAM) $(PROGRAM).map

Important: When using the sample Makefile above via copy & paste it is necessary to replace the eight spaces at the beginning of command lines (lines 26, 29 and 32) with a tab character (ASCII code 9).

3.1 Invoking the sample Makefile

Without any specific configuration the sample Makefile will compile and link using GCC. In order to rather use cc65 the variable CC65_TARGET needs to be defined. This may by done as an environment variable or simply as part of the Makefile. However to quickly switch between compilers and/or cc65 targets it is best done on the GNU Make command line like this:

make CC65_TARGET=c64

The sample Makefile presumes the variable CC65_HOME to point to the directory cc65 is located in. Again there are several ways to define this variable but as its value typically won't change often it is best done as an environment variable. On Windows the cc65 .exe installer package takes care of creating a CC65_HOME environment variable.

3.2 Understanding the sample Makefile

Most parts of the sample Makefile follow the guidelines in the GNU Make Manual that can be searched online for background information. The automatic generation of dependency however rather works as described by the GNU Make maintainer Paul D. Smith in Advanced Auto-Dependencies. Fortunately both GCC and cc65 directly support this method in the meantime.

3.3 Invoking the sample Makefile on Windows

The recommended way to use GNU Make on Windows is to install it as part of a Cygwin environment. For more information see the Cygwin home page:

http://www.cygwin.com/

If however installing Cygwin shouldn't be an option for one or the other reason then the sample Makefile may be invoked from the Windows Command Prompt (cmd.exe) by downloading the following programs:


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