Replace sconfig with a C implementation.

(smaller, faster, standard parser generator, no more python)

Provide precompiled parser, so bison and flex are optional dependencies.

Adapt Makefile and abuild (which uses some sconfig file as a
magic path) to match.

Drop python as dependency from README, and add bison and flex
as optional dependencies

Signed-off-by: Patrick Georgi <patrick.georgi@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Ronald G. Minnich <rminnich@gmail.com>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5373 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

util/sconfig/Makefile.inc

@@ -0,0 +1,30 @@
+sconfigobj :=
+sconfigobj += lex.yy.o
+sconfigobj += sconfig.tab.o
+
+$(obj)/util/sconfig:
+	mkdir -p $@
+
+$(obj)/util/sconfig/%.o: $(obj)/util/sconfig/%.c
+	printf "    HOSTCC     $(subst $(obj)/,,$(@))\n"
+	$(HOSTCC) $(SCONFIGFLAGS) $(HOSTCFLAGS) -c -o $@ $<
+
+ifdef SCONFIG_GENPARSER
+$(top)/util/sconfig/lex.yy.c_shipped: $(top)/util/sconfig/sconfig.l
+	flex -o $@ $<
+
+# the .c rule also creates .h
+$(top)/util/sconfig/sconfig.tab.h_shipped: $(top)/util/sconfig/sconfig.tab.c_shipped
+$(top)/util/sconfig/sconfig.tab.c_shipped: $(top)/util/sconfig/sconfig.y
+	bison --defines=$(top)/util/sconfig/sconfig.tab.h_shipped -o $@ $<
+
+endif
+
+$(obj)/util/sconfig/lex.yy.o: $(obj)/util/sconfig/sconfig.tab.h
+
+$(obj)/util/sconfig/%: $(top)/util/sconfig/%_shipped
+	cp $< $@
+
+$(obj)/util/sconfig/sconfig: $(obj)/util/sconfig $(addprefix $(obj)/util/sconfig/,$(sconfigobj))
+	printf "    HOSTCXX    $(subst $(obj)/,,$(@)) (link)\n"
+	$(HOSTCXX) $(SCONFIGFLAGS) -o $@ $(addprefix $(obj)/util/sconfig/,$(sconfigobj))