[devel] Revise scripts to work with pnglibconf.h

scripts/pnglibconf.mak

@@ -0,0 +1,44 @@
+#!/usr/bin/make -f
+# pnglibconf.mak - standard make lines for pnglibconf.h
+# 
+# These lines are copied from Makefile.am, they illustrate
+# how to automate the build of pnglibconf.h from scripts/pnglibconf.dfa
+# given 'awk' and 'sed'
+
+# Override as appropriate:
+AWK = awk
+SED = sed
+CPP = $(CC) -E
+COPY = cp
+DELETE = rm -f
+ECHO = echo
+
+# CPPFLAGS should contain the options to control the result,
+# but DEFS and CFLAGS are also supported here, override
+# as appropriate
+DFNFLAGS = $(DEFS) $(CPPFLAGS) $(CFLAGS)
+
+# The standard pnglibconf.h exists as scripts/pnglibconf.h,
+# copy this if the following doesn't work.
+pnglibconf.h: pnglibconf.dfn
+	$(DELETE) $@ dfn.c dfn1.out dfn2.out dfn3.out
+	$(ECHO) '#include "pnglibconf.dfn"' >dfn.c
+	$(CPP) $(DFNFLAGS) dfn.c >dfn1.out
+	$(SED) -n -e 's|^.*PNG_DEFN_MAGIC-\(.*\)-PNG_DEFN_END.*$$|\1|p'\
+	    dfn1.out >dfn2.out
+	$(SED) -e 's| *@@@ *||g' -e 's| *$$||' dfn2.out >dfn3.out
+	$(COPY) dfn3.out $@
+	$(DELETE) dfn.c dfn1.out dfn2.out dfn3.out
+
+pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk
+	$(DELETE) $@ dfn1.out dfn2.out
+	$(AWK) -f scripts/options.awk pre=1 out=dfn1.out\
+	    scripts/pnglibconf.dfa 1>&2
+	$(AWK) -f scripts/options.awk pre=0 out=dfn2.out dfn1.out 1>&2
+	$(COPY) dfn2.out $@
+	$(DELETE) dfn1.out dfn2.out
+
+clean-pnglibconf:
+	$(DELETE) pnglibconf.h pnglibconf.dfn dfn.c dfn1.out dfn2.out dfn3.out
+
+clean: clean-pnglibconf