# Makefile for PngMinus (pnm2pngm)

# Linux / Unix

#CC=cc

CC=gcc

LD=$(CC)

# If awk fails try

# make AWK=nawk

# If cpp fails try

# make CPP=/lib/cpp

RM=rm -f

COPY=cp

CPPFLAGS=-I. -DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP

CFLAGS=-O1 -Wall

C=.c

O=.o

L=.a

E=

# Where to find the source code:

PNGSRC =../../..

ZLIBSRC=$(PNGSRC)/../zlib

PROGSRC=$(PNGSRC)/contrib/pngminus

# Zlib

ZSRCS  = adler32$(C) compress$(C) crc32$(C) deflate$(C) \

	 trees$(C) zutil$(C)

# Standard headers

#ZH     = zlib.h crc32.h deflate.h trees.h zutil.h

ZH     = zlib.h crc32.h deflate.h trees.h zutil.h

# Machine generated headers

ZCONF  = zconf.h

# Headers callers use

ZINC   = zlib.h $(ZCONF)

# Headers the Zlib source uses

ZHDRS  = $(ZH) $(ZCONF)

# compress is not required; it is needed to link the zlib

# code because deflate defines an unused API function deflateBound

# which itself calls compressBound from compress.

ZOBJS  = adler32$(O) compress$(O) crc32$(O) deflate$(O) \

	 trees$(O) zutil$(O)

# libpng

PNGSRCS=png$(C) pngerror$(C) pngget$(C) pngmem$(C) \

	pngset$(C) pngtrans$(C) pngwio$(C) pngwrite$(C) \

	pngwtran$(C) pngwutil$(C)

# Standard headers

PNGH   =png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h

# Machine generated headers

PNGCONF=pnglibconf.h

# Headers callers use

PNGINC= png.h pngconf.h pngusr.h $(PNGCONF)

# Headers the PNG library uses

PNGHDRS=$(PNGH) $(PNGCONF) pngusr.h

PNGOBJS=png$(O) pngerror$(O) pngget$(O) pngmem$(O) \

	pngset$(O) pngtrans$(O) pngwio$(O) pngwrite$(O) \

	pngwtran$(O) pngwutil$(O)

PROGSRCS= pnm2pngm$(C)

PROGHDRS=

PROGDOCS=

PROGOBJS= pnm2pngm$(O)

OBJS    = $(PROGOBJS) $(PNGOBJS) $(ZOBJS)

# implicit make rules -------------------------------------------------------

.c$(O):

	$(CC) -c $(CPPFLAGS) $(CFLAGS) $<

# dependencies

all: pnm2pngm$(E)

pnm2pngm$(E): $(OBJS)

	$(LD) -o pnm2pngm$(E) $(OBJS)

# The DFA_XTRA setting turns all libpng options off then

# turns on those required for this minimal build.

# The CPP_FLAGS setting causes pngusr.h to be included in

# both the build of pnglibconf.h and, subsequently, when

# building libpng itself.

$(PNGCONF): $(PNGSRC)/scripts/pnglibconf.mak $(ZH)\

	$(PNGSRC)/scripts/pnglibconf.dfa \

	$(PNGSRC)/scripts/options.awk pngusr.h pngusr.dfa

	$(RM) pnglibconf.h pnglibconf.dfn

	$(MAKE) -f $(PNGSRC)/scripts/pnglibconf.mak $(MAKEFLAGS)\

	    srcdir=$(PNGSRC) CPPFLAGS="-DPNG_USER_CONFIG -I."\

	    DFA_XTRA="pngusr.dfa" $@

clean:

	$(MAKE) -f $(PNGSRC)/scripts/pnglibconf.mak $(MAKEFLAGS)\

	    srcdir=$(PNGSRC) clean

	$(RM) pnm2pngm$(O)

	$(RM) pnm2pngm$(E)

	$(RM) $(OBJS)

# distclean also removes the copied source and headers

distclean: clean

	$(RM) -r scripts # historical reasons

	$(RM) $(PNGSRCS) $(PNGH)

	$(RM) $(ZSRCS) $(ZH) $(ZCONF)

	$(RM) $(PROGSRCS) $(PROGHDRS) $(PROGDOCS)

# Header file dependencies:

$(PROGOBJS): $(PROGHDRS) $(PNGINC) $(ZINC)

$(PNGOBJS): $(PNGHDRS) $(ZINC)

$(ZOBJS): $(ZHDRS)

# Gather the source code from the respective directories

$(PNGSRCS) $(PNGH): $(PNGSRC)/$@

	$(RM) $@

	$(COPY) $(PNGSRC)/$@ $@

# No dependency on the ZLIBSRC target so that it only needs

# to be specified once.

$(ZSRCS) $(ZH):

	$(RM) $@

	$(COPY) $(ZLIBSRC)/$@ $@

# The unconfigured zconf.h varies in name according to the

# zlib release

$(ZCONF):

	$(RM) $@

	@for f in zconf.h.in zconf.in.h zconf.h; do\

	    test -r $(ZLIBSRC)/$$f &&\

	    echo $(COPY) $(ZLIBSRC)/$$f $@ &&\

	    $(COPY) $(ZLIBSRC)/$$f $@ && exit 0;\

	done; echo copy: $(ZLIBSRC)/zconf.h not found; exit 1

pnm2pngm.c: $(PROGSRC)/pnm2png.c

	$(RM) $@

	$(COPY) $(PROGSRC)/pnm2png.c $@

# End of makefile for pnm2pngm