1# This is an OpenWatcom make file which builds pnglibconf.h - the libpng
  2# configuration header.  You can ignore this file if you don't need to
  3# configure libpng; a default configuration will be built.
  4#
  5# For more information build libpng.wpj under the IDE and then read the
  6# generated files:
  7#
  8#    config.inf: Basic configuration information for a standard build.
  9#    pngconfig.dfa: Advanced configuration for non-standard libpng builds.
 10#
 11DELETE=rm -f
 12ECHO=echo
 13COPY=copy
 14#
 15# If your configuration needs to test compiler flags when building
 16# pnglibconf.h you may need to override the following on the wmake command
 17# line:
 18CFLAGS=
 19CC=wcl386
 20CPP=$(CC) -pw0
 21#
 22# Read awk from the environment if set, else it can be set on the command
 23# line (the default approach is to set the %awk% environment variable in the
 24# IDE libpng.wpj 'before' rule - this setting is local.)
 25!ifdef %awk
 26AWK=$(%awk)
 27!endif
 28#
 29# pnglibconf.h must exist in the source directory, this is the final rule
 30# which copies the local built version (and this is the default target for
 31# this makefile.)
 32..\..\pnglibconf.h: pnglibconf.h
 33 $(COPY) pnglibconf.h $@
 34
 35!ifdef AWK
 36# CPPFLAGS should contain the options to control the result,
 37# but DEFS and CFLAGS are also supported here, override
 38# as appropriate
 39DFNFLAGS = $(DEFS) $(CPPFLAGS) $(CFLAGS)
 40
 41pnglibconf.h: pnglibconf.dfn
 42 $(DELETE) $@ dfn.c dfn1.out dfn2.out
 43 $(ECHO) $#include "pnglibconf.dfn" >dfn.c
 44 $(CPP) $(DFNFLAGS) dfn.c >dfn1.out
 45 $(AWK) -f << dfn1.out >dfn2.out
 46/^.*PNG_DEFN_MAGIC-.*-PNG_DEFN_END.*$$/{
 47 sub(/^.*PNG_DEFN_MAGIC-/, "")
 48 sub(/ *-PNG_DEFN_END.*$$/, "")
 49 gsub(/ *@@@ */, "")
 50 print
 51}
 52<<
 53 $(COPY) dfn2.out $@
 54 @type << >pngconfig.inf
 55This is a locally configurable build of libpng.lib; for configuration
 56instructions consult and edit projects/openwatcom/pngconfig.dfa
 57<<
 58 $(DELETE) dfn.c dfn1.out dfn2.out
 59
 60pnglibconf.dfn: ..\..\scripts\pnglibconf.dfa ..\..\scripts\options.awk pngconfig.dfa ..\..\pngconf.h
 61 $(DELETE) $@ dfn1.out dfn2.out
 62 $(AWK) -f ..\..\scripts\options.awk out=dfn1.out version=search ..\..\pngconf.h ..\..\scripts\pnglibconf.dfa pngconfig.dfa $(DFA_XTRA) 1>&2
 63 $(AWK) -f ..\..\scripts\options.awk out=dfn2.out dfn1.out 1>&2
 64 $(COPY) dfn2.out $@
 65 $(DELETE) dfn1.out dfn2.out
 66
 67!else
 68# The following lines are used to copy scripts\pnglibconf.h.prebuilt and make
 69# the required change to the calling convention.
 70#
 71# By default libpng is built to use the __cdecl calling convention on
 72# Windows.  This gives compatibility with MSVC and GCC.  Unfortunately it
 73# does not work with OpenWatcom because OpenWatcom implements longjmp using
 74# the __watcall convention (compared with both MSVC and GCC which use __cdecl
 75# for library functions.)
 76#
 77# Thus the default must be changed to build on OpenWatcom and, once changed,
 78# the result will not be compatible with applications built using other
 79# compilers (in fact attempts to build will fail at compile time.)
 80#
 81pnglibconf.h: ..\..\scripts\pnglibconf.h.prebuilt .existsonly
 82 @$(ECHO) .
 83 @$(ECHO) .
 84 @$(ECHO) $$(AWK) NOT AVAILABLE: COPYING scripts\pnglibconf.h.prebuilt
 85 @$(ECHO) .
 86 @$(ECHO) .
 87 vi -q -k ":1,$$s/PNG_API_RULE 0$$/PNG_API_RULE 2/\n:w! $@\n:q!\n" ..\..\scripts\pnglibconf.h.prebuilt
 88 @$(ECHO) .
 89 @$(ECHO) .
 90 @$(ECHO) YOU HAVE A DEFAULT CONFIGURATION BECAUSE YOU DO NOT HAVE AWK!
 91 @$(ECHO) .
 92 @$(ECHO) .
 93 @type << >pngconfig.inf
 94This is the default configuration of libpng.lib, if you wish to
 95change the configuration please consult the instructions in
 96projects/owatcom/pngconfig.dfa.
 97<<
 98
 99!endif
100
101# Make the default files
102defaults: .symbolic
103 @$(COPY) << config.inf
104$# The libpng project is incompletely configured.  To complete configuration
105$# please complete the following steps:
106$#
107$#   1) Edit the 'before' rule of libpng.wpj (from the IDE) to define the
108$#      locations of the zlib include file zlib.h and the built zlib library,
109$#      zlib.lib.
110$#
111$#   2) If you want to change libpng to a non-standard configuration also
112$#      change the definition of 'awk' in the before rule to the name of your
113$#      awk command.  For more instructions on configuration read
114$#      pngconfig.dfa.
115$#
116$#   3) Delete this file (config.inf).
117<<
118 @$(COPY) << pngconfig.dfa
119$# pngconfig.dfa: this file contains configuration options for libpng.
120$# If emtpy the standard configuration will be built.  For this file to be
121$# used a working version of the program 'awk' is required and the program
122$# must be identified in the 'before' rule of the project.
123$#
124$# If you don't already have 'awk', or the version of awk you have seems not
125$# to work, download Brian Kernighan's awk (Brian Kernighan is the author of
126$# awk.)  You can find source code and a built executable (called awk95.exe)
127$# here:
128$#
129$#     https://www.cs.princeton.edu/~bwk/btl.mirror/
130$#
131$# The executable works just fine.
132$#
133$# If build issues errors after a change to pngconfig.dfa you have entered
134$# inconsistent feature requests, or even malformed requests, in
135$# pngconfig.dfa.  The error messages from awk should be comprehensible, but
136$# if not simply go back to the start (nothing but comments in this file) and
137$# enter configuration lines one by one until one produces an error.  (Or, of
138$# course, do the standard binary chop.)
139$#
140$# You need to rebuild everything after a change to pnglibconf.dfa - i.e. you
141$# must do Actions/Mark All Targets for Remake.  This is because the compiler
142$# generated dependency information (as of OpenWatcom 1.9) does not record the
143$# dependency on pnglibconf.h correctly.
144$#
145$# If awk isn't set then this file is bypassed.  If you just want the standard
146$# configuration it is automatically produced from the distributed version
147$# (scripts\pnglibconf.h.prebuilt) by editting PNG_API_RULE to 2 (to force use
148$# of the OpenWatcom library calling convention.)
149$#
150<<
151
152clean:: .symbolic
153 $(DELETE) ..\..\pnglibconf.h pnglibconf.* dfn.c *.out pngconfig.inf
154 $(DELETE) *.obj *.mbr *.sym *.err *.pch libpng.mk
155 $(DELETE) libpng.lib libpng.lbr libpng.lb1 libpng.cbr libpng.mk1
156 $(DELETE) pngtest.exe pngtest.map pngtest.lk1 pngtest.mk1
157 $(DELETE) pngvalid.exe pngvalid.map pngvalid.lk1 pngvalid.mk1
158
159distclean:: clean .symbolic
160 $(DELETE) zlib.inf awk.inf config.inf pngconfig.dfa