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Subject: Re: Support for out-of-tree build
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* 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/
> +

one more comment:
tools/ is now used for both sources and outputs,
i think it can be used for sources only by moving
the tools outputs under obj/ (so tools/ does not
need to be created out of tree, only obj/ and lib/)