mirror of https://github.com/cc65/cc65.git
149 lines
4.7 KiB
Plaintext
149 lines
4.7 KiB
Plaintext
<!doctype linuxdoc system>
|
|
|
|
<article>
|
|
<title>Using GNU Make with cc65
|
|
<author><url url="mailto:ol.sc@web.de" name="Oliver Schmidt">
|
|
|
|
<abstract>
|
|
How to build your program using the GNU Make utility.
|
|
</abstract>
|
|
|
|
<!-- Table of contents -->
|
|
<toc>
|
|
|
|
<!-- Begin the document -->
|
|
|
|
<sect>Overview<p>
|
|
|
|
This document describes how to build your programs using the cc65 development
|
|
tools and the GNU Make utility.
|
|
|
|
The cc65 development package doesn't come with a make utility. However this is
|
|
no issue because GNU Make works very nicely with cc65.
|
|
|
|
|
|
|
|
<sect>What is GNU Make?<p>
|
|
|
|
GNU Make is a both very powerful and very popular make utility. It might even
|
|
be called the de facto standard for make utilities. For more information see
|
|
the GNU Make home page:
|
|
|
|
<url url="http://www.gnu.org/software/make/">
|
|
|
|
The cc65 development package is available as binaries for several host systems
|
|
and can easily built for quite some additional systems. The very same is true
|
|
for GNU Make so a cc65-based project coming with a GNU Make Makefile can easily
|
|
be built by any cc65 developer no matter what host system is used.
|
|
|
|
Because of the strong alignment of the cc65 compiler with the ISO C standard it
|
|
is very well feasible to compile a single C code base both with the cc65
|
|
compiler and other C compilers like for example GCC. GNU Make turns out to be
|
|
very well suited to build projects for several target systems using multiple
|
|
compilers as it isn't tied to any C compiler.
|
|
|
|
|
|
|
|
<sect>A sample Makefile<p>
|
|
|
|
This Makefile is a fully functional sample for compiling several C sources
|
|
(here <tt/foo.c/ and <tt/bar.c/) and link the resulting object files into an
|
|
executable program (here <tt/foobar/):
|
|
|
|
<tscreen><verb>
|
|
SOURCES = foo.c bar.c
|
|
|
|
PROGRAM = foobar
|
|
|
|
ifdef CC65_TARGET
|
|
CC = 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
|
|
</verb></tscreen>
|
|
|
|
<bf/Important:/ When using the sample Makefile above via copy & paste it is
|
|
important to make sure that command lines (lines 26, 29 and 32) start
|
|
with a tab character (ASCII code 9).
|
|
|
|
|
|
<sect1>Invoking the sample Makefile<p>
|
|
|
|
Without any specific configuration the sample Makefile will compile and link
|
|
using GCC. In order to rather use cc65 the variable <tt/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:
|
|
|
|
<tscreen><verb>
|
|
make CC65_TARGET=c64
|
|
</verb></tscreen>
|
|
|
|
|
|
<sect1>Understanding the sample Makefile<p>
|
|
|
|
Most parts of the sample Makefile follow the guidelines in the
|
|
<url url="http://www.gnu.org/software/make/manual/make.html" name="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
|
|
<url url="http://make.paulandlesley.org/autodep.html#advanced" name="&dquot;Advanced Auto-Dependencies&dquot;">.
|
|
Fortunately both GCC and cc65 directly support this method in the meantime.
|
|
|
|
|
|
<sect1>Invoking the sample Makefile on Windows<p>
|
|
|
|
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:
|
|
|
|
<url url="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:
|
|
|
|
<itemize>
|
|
<item><url name="make.exe" url="http://gnuwin32.sourceforge.net/packages/make.htm">
|
|
<item><url name="rm.exe" url="http://gnuwin32.sourceforge.net/packages/coreutils.htm">
|
|
</itemize>
|
|
|
|
|
|
|
|
<sect>Target-specific Variable Values<p>
|
|
|
|
The very limited resources of the cc65 target machines now and then require
|
|
manual optimization of the build process by compiling individual source files
|
|
with different compiler options. GNU Make offers
|
|
<url url="http://www.gnu.org/software/make/manual/html_node/Target_002dspecific.html" name="Target-specific Variable Values">
|
|
perfectly suited for doing so. For example placing the code of the two modules
|
|
<tt/foo/ and <tt/bar/ in the segment <tt/FOOBAR/ can be achieved with this
|
|
target-specific variable definition:
|
|
|
|
<tscreen><verb>
|
|
foo.o bar.o: CFLAGS += --code-name FOOBAR
|
|
</verb></tscreen>
|
|
|
|
</article>
|