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pass better arguments to mkdep.
- some std= parameters are actually critical, -std=c++11 makes a huge
difference for clang.
- explicitly ask mkdep to run the C++ compiler for C++ code, as again,
some compilers will see the difference.

(this should allow us to repair make depend under src/gnu/usr.bin/clang)

okay kettenis@

#	$OpenBSD: bsd.dep.mk,v 1.14 2017/06/04 12:25:19 espie Exp $
#	$NetBSD: bsd.dep.mk,v 1.12 1995/09/27 01:15:09 christos Exp $

# some of the rules involve .h sources, so remove them from mkdep line
.if !target(depend)
depend: beforedepend .depend realdepend afterdepend
.ORDER: beforedepend .depend realdepend afterdepend
realdepend: _SUBDIRUSE

.  if defined(SRCS) && !empty(SRCS)
.depend: ${SRCS} ${_LEXINTM} ${_YACCINTM}
	@rm -f .depend
	@files="${.ALLSRC:M*.s} ${.ALLSRC:M*.S}"; \
	if [ "$$files" != " " ]; then \
	  echo mkdep -a ${MKDEP} ${CFLAGS:M-std=*} ${CFLAGS:M-[ID]*} ${CPPFLAGS} ${AINC} $$files;\
	  mkdep -a ${MKDEP} ${CFLAGS:M-std=*} ${CFLAGS:M-[ID]*} ${CPPFLAGS} ${AINC} $$files; \
	fi
	@files="${.ALLSRC:M*.c}"; \
	if [ "$$files" != "" ]; then \
	  echo mkdep -a ${MKDEP} ${CFLAGS:M-std=*} ${CFLAGS:M-[ID]*} ${CPPFLAGS} $$files; \
	  mkdep -a ${MKDEP} ${CFLAGS:M-[ID]*} ${CPPFLAGS} $$files; \
	fi
	@files="${.ALLSRC:M*.cc} ${.ALLSRC:M*.C} ${.ALLSRC:M*.cpp}"; \
	files="$$files ${.ALLSRC:M*.cxx}"; \
	if [ "$$files" != "   " ]; then \
	  echo CC=${CXX:Q} mkdep -a ${MKDEP} ${CXXFLAGS:M-std=*} ${CXXFLAGS:M-[ID]*} ${CPPFLAGS} $$files; \
	  CC=${CXX:Q} mkdep -a ${MKDEP} ${CXXFLAGS:M-std=*} ${CXXFLAGS:M-[ID]*} ${CPPFLAGS} $$files; \
	fi
.  else
.depend:
.  endif
.  if !target(beforedepend)
beforedepend:
.  endif
.  if !target(afterdepend)
afterdepend:
.  endif
.endif

.if !target(tags)
.  if defined(SRCS)
tags: ${SRCS} _SUBDIRUSE
	-cd ${.CURDIR}; ${CTAGS} -f /dev/stdout -d ${.ALLSRC:N*.h} | \
	    sed "s;\${.CURDIR}/;;" > tags
.  else
tags:
.  endif
.endif

.if defined(SRCS)
cleandir: cleandepend
cleandepend:
	rm -f .depend ${.CURDIR}/tags
.endif

.PHONY: beforedepend depend afterdepend cleandepend realdepend