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effectively kill depend as an independant target (there are a few corners
where a separate depend step is still needed, mostly gcc3 and mesa).

Use of BUILDFIRST is mostly enough to make sure important stuff is built
first.

Otherwise, this makes use of -M* compiler options to generate dependencies
on the fly.  There is a bit of behind-the-scene for targets with several
steps (like yacc and/or libraries) and the compiler needs extra hand-holding
with assembler files (don't know why, don't care).

Idea based on guenther@'s initial kernel work, loads of input from
drahn, aoyama, tb, etc.

okay tb@

"why wait" deraadt@

#	$OpenBSD: bsd.sys.mk,v 1.11 2017/07/01 14:41:54 espie Exp $
#	$NetBSD: bsd.sys.mk,v 1.2 1995/12/13 01:25:07 cgd Exp $
#
# Overrides used for OpenBSD source tree builds.

#CFLAGS+= -Werror

.if defined(DESTDIR)
CPPFLAGS+= -nostdinc -idirafter ${DESTDIR}/usr/include
CXXFLAGS+= -idirafter ${DESTDIR}/usr/include/g++
.endif

.if defined(PARALLEL)
# Lex
.l:
	${LEX.l} -o${.TARGET:R}.yy.c ${.IMPSRC}
	${LINK.c} -o ${.TARGET} ${.TARGET:R}.yy.c ${LDLIBS} -ll
	rm -f ${.TARGET:R}.yy.c
.l.c:
	${LEX.l} -o${.TARGET} ${.IMPSRC}
.l.o:
	${LEX.l} -o${.TARGET:R}.yy.c ${.IMPSRC}
	${COMPILE.c} -o ${.TARGET} ${.TARGET:R}.yy.c 
	rm -f ${.TARGET:R}.yy.c
	if test -f ${.TARGET:R}.d; then sed -i -e 's,${.TARGET:R}.yy.c,${.IMPSRC},' ${.TARGET:R}.d; fi

# Yacc
.y:
	${YACC.y} -b ${.TARGET:R} ${.IMPSRC}
	${LINK.c} -o ${.TARGET} ${.TARGET:R}.tab.c ${LDLIBS}
	rm -f ${.TARGET:R}.tab.c
.y.c:
	${YACC.y} -b ${.TARGET:R} ${.IMPSRC}
	mv ${.TARGET:R}.tab.c ${.TARGET}
.y.o:
	${YACC.y} -b ${.TARGET:R} ${.IMPSRC}
	${COMPILE.c} -o ${.TARGET} ${.TARGET:R}.tab.c
	rm -f ${.TARGET:R}.tab.c
	if test -f ${.TARGET:R}.d; then sed -i -e 's,${.TARGET:R}.tab.c,${.IMPSRC},' ${.TARGET:R}.d; fi
.endif