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From: Szabolcs Nagy <nsz@port70.net>
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Subject: Re: Support for out-of-tree build
Date: Sat, 21 Nov 2015 02:16:48 +0100
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* Szabolcs Nagy <nsz@port70.net> [2015-11-21 02:05:33 +0100]:

> * Petr Hosek <phosek@chromium.org> [2015-11-19 00:22:09 +0000]:
> > +$(ALL_LIBS): | lib/
> > +$(ALL_TOOLS): | tools/
> > +$(CRT_LIBS:lib/%=$(objdir)/crt/%): | $(objdir)/crt/
> > +$(OBJS) $(LOBJS): | $(sort $(dir $(OBJS)))
> > +$(GENH): | $(objdir)/include/bits/
> > +$(GENH_INT): | $(objdir)/src/internal/
> > +
> > +SRC_DIRS = $(sort $(dir $(ALL_LIBS) $(ALL_TOOLS) $(OBJS) $(GENH) $(GENH_INT)) $(addprefix $(objdir)/, crt/ include/))
> > +
> > +$(SRC_DIRS):
> > +	mkdir -p $@
> > +
> ...
> > +$(objdir)/include/bits/alltypes.h: $(srcdir)/arch/$(ARCH)/bits/alltypes.h.in $(srcdir)/include/alltypes.h.in $(srcdir)/tools/mkalltypes.sed $(objdir)/include/bits
> 
> this needs a / at the end otherwise make 4.1 fails with
> 
> make: *** No rule to make target 'obj/include/bits', needed by 'obj/include/bits/alltypes.h'.  Stop.
> 

sorry,
the obj/include/bits dependency has to be removed here,
the order only dep does the right thing