# This is an OpenWatcom make file which builds pnglibconf.h - the libpng

# configuration header. You can ignore this file if you don't need to

# configure libpng; a default configuration will be built.

#

# For more information build libpng.wpj under the IDE and then read the

# generated files:

#

# config.inf: Basic configuration information for a standard build.

# pngconfig.dfa: Advanced configuration for non-standard libpng builds.

#

DELETE=rm -f

ECHO=echo

COPY=copy

#

# If your configuration needs to test compiler flags when building

# pnglibconf.h you may need to override the following on the wmake command

# line:

CFLAGS=

CC=wcl386

CPP=$(CC) -pw0

#

# Read awk from the environment if set, else it can be set on the command

# line (the default approach is to set the %awk% environment variable in the

# IDE libpng.wpj 'before' rule - this setting is local.)

!ifdef %awk

AWK=$(%awk)

!endif

#

# pnglibconf.h must exist in the source directory, this is the final rule

# which copies the local built version (and this is the default target for

# this makefile.)

..\..\pnglibconf.h: pnglibconf.h

$(COPY) pnglibconf.h $@

!ifdef AWK

# CPPFLAGS should contain the options to control the result,

# but DEFS and CFLAGS are also supported here, override

# as appropriate

DFNFLAGS = $(DEFS) $(CPPFLAGS) $(CFLAGS)

pnglibconf.h: pnglibconf.dfn

$(DELETE) $@ dfn.c dfn1.out dfn2.out

$(ECHO) $#include "pnglibconf.dfn" >dfn.c

$(CPP) $(DFNFLAGS) dfn.c >dfn1.out

$(AWK) -f << dfn1.out >dfn2.out

/^.*PNG_DEFN_MAGIC-.*-PNG_DEFN_END.*$$/{

sub(/^.*PNG_DEFN_MAGIC-/, "")

sub(/ *-PNG_DEFN_END.*$$/, "")

gsub(/ *@@@ */, "")

print

}

<<

$(COPY) dfn2.out $@

@type << >pngconfig.inf

This is a locally configurable build of libpng.lib; for configuration

instructions consult and edit projects/openwatcom/pngconfig.dfa

<<

$(DELETE) dfn.c dfn1.out dfn2.out

pnglibconf.dfn: ..\..\scripts\pnglibconf.dfa ..\..\scripts\options.awk pngconfig.dfa ..\..\pngconf.h

$(DELETE) $@ dfn1.out dfn2.out

$(AWK) -f ..\..\scripts\options.awk out=dfn1.out version=search ..\..\pngconf.h ..\..\scripts\pnglibconf.dfa pngconfig.dfa $(DFA_XTRA) 1>&2

$(AWK) -f ..\..\scripts\options.awk out=dfn2.out dfn1.out 1>&2

$(COPY) dfn2.out $@

$(DELETE) dfn1.out dfn2.out

!else

# The following lines are used to copy scripts\pnglibconf.h.prebuilt and make

# the required change to the calling convention.

#

# By default libpng is built to use the __cdecl calling convention on

# Windows. This gives compatibility with MSVC and GCC. Unfortunately it

# does not work with OpenWatcom because OpenWatcom implements longjmp using

# the __watcall convention (compared with both MSVC and GCC which use __cdecl

# for library functions.)

#

# Thus the default must be changed to build on OpenWatcom and, once changed,

# the result will not be compatible with applications built using other

# compilers (in fact attempts to build will fail at compile time.)

#

pnglibconf.h: ..\..\scripts\pnglibconf.h.prebuilt .existsonly

@$(ECHO) .

@$(ECHO) .

@$(ECHO) $$(AWK) NOT AVAILABLE: COPYING scripts\pnglibconf.h.prebuilt

@$(ECHO) .

@$(ECHO) .

vi -q -k ":1,$$s/PNG_API_RULE 0$$/PNG_API_RULE 2/\n:w! $@\n:q!\n" ..\..\scripts\pnglibconf.h.prebuilt

@$(ECHO) .

@$(ECHO) .

@$(ECHO) YOU HAVE A DEFAULT CONFIGURATION BECAUSE YOU DO NOT HAVE AWK!

@$(ECHO) .

@$(ECHO) .

@type << >pngconfig.inf

This is the default configuration of libpng.lib, if you wish to

change the configuration please consult the instructions in

projects/owatcom/pngconfig.dfa.

<<

!endif

# Make the default files

defaults: .symbolic

@$(COPY) << config.inf

$# The libpng project is incompletely configured. To complete configuration

$# please complete the following steps:

$#

$# 1) Edit the 'before' rule of libpng.wpj (from the IDE) to define the

$# locations of the zlib include file zlib.h and the built zlib library,

$# zlib.lib.

$#

$# 2) If you want to change libpng to a non-standard configuration also

$# change the definition of 'awk' in the before rule to the name of your

$# awk command. For more instructions on configuration read

$# pngconfig.dfa.

$#

$# 3) Delete this file (config.inf).

<<

@$(COPY) << pngconfig.dfa

$# pngconfig.dfa: this file contains configuration options for libpng.

$# used a working version of the program 'awk' is required and the program

$# must be identified in the 'before' rule of the project.

$#

$# If you don't already have 'awk', or the version of awk you have seems not

$# to work, download Brian Kernighan's awk (Brian Kernighan is the author of

$# awk.) You can find source code and a built executable (called awk95.exe)

$# here:

$#

$# https://www.cs.princeton.edu/~bwk/btl.mirror/

$#

$# The executable works just fine.

$#

$# If build issues errors after a change to pngconfig.dfa you have entered

$# inconsistent feature requests, or even malformed requests, in

$# pngconfig.dfa. The error messages from awk should be comprehensible, but

$# if not simply go back to the start (nothing but comments in this file) and

$# enter configuration lines one by one until one produces an error. (Or, of

$# course, do the standard binary chop.)

$#

$# You need to rebuild everything after a change to pnglibconf.dfa - i.e. you

$# must do Actions/Mark All Targets for Remake. This is because the compiler

$# generated dependency information (as of OpenWatcom 1.9) does not record the

$# dependency on pnglibconf.h correctly.

$#

$# If awk isn't set then this file is bypassed. If you just want the standard

$# configuration it is automatically produced from the distributed version

$# of the OpenWatcom library calling convention.)

$#

<<

clean:: .symbolic

$(DELETE) ..\..\pnglibconf.h pnglibconf.* dfn.c *.out pngconfig.inf

$(DELETE) *.obj *.mbr *.sym *.err *.pch libpng.mk

$(DELETE) libpng.lib libpng.lbr libpng.lb1 libpng.cbr libpng.mk1

$(DELETE) pngtest.exe pngtest.map pngtest.lk1 pngtest.mk1

$(DELETE) pngvalid.exe pngvalid.map pngvalid.lk1 pngvalid.mk1

distclean:: clean .symbolic

$(DELETE) zlib.inf awk.inf config.inf pngconfig.dfa