Re: flat OBJDIR

[Noel Yap]

IME, it's much easier to duplicate the directory structure of src than it is to have the obj dir flat.  So, if you went ahead with what you plan, you'd put all the work in to get a flat directory, then put more work in ripping out the added complexity. 
IMHO, it'd be much better to duplicate the directory structure and write a custom script that will do the comparisons.

MTC,
Noel

Alexander Farber wrote:

> Hi Ken,
>
> yes, I was going to replicate the directory structure of my 
> sources, but later. Currently I want the destination of 
> my objects to match the one of the original scripted build 
> system, since it is rather large (a 60 MB big log file) and
> I have to compare and verify the produced files...
>
> Do you have an error in your "testcase"? It fails for me:
>
> bolinux72:afarber {529} gmake -f Makefile2
> gmake: *** No rule to make target `objdir/a.obj', needed by `all'.  Stop.
>
> bolinux72:afarber {530} cat Makefile2 
> OBJDIR = objdir
> OBJSUBDIRS = $(addprefix $(OBJDIR)/,$(dir $(SRCS)))
> SRCS = a.cpp \
>        src1/b.cpp
> OBJS = $(addprefix $(OBJDIR)/,$(SRCS:.cpp=.obj))
>
> all: $(OBJS)
>
> $(OBJDIR) $(OBJSUBDIRS):
>         mkdir -p $(@)
>
> $(OBJDIR)/%.obj: %.cpp | $(OBJDIR) $(OBJSUBDIRS)
>         g++ -o $@ -c $<
>
>
>
>
> On Mon, Aug 23, 2004 at 12:18:18PM -0400, Ken Smith wrote:
>
> > On Mon, Aug 23, 2004 at 04:38:52PM +0000, Alexander Farber wrote:
> >
> > > OBJS = $(addprefix $(OBJDIR)/, $(notdir $(SRCS:.cpp=.obj)))
> >
> > Instead of trying to build all the objects into a single directory,
> > could you replicate the directory structure of your sources in your
> > object directory?  For example, your object directory could look like
> >
> > objdir/a.obj
> > objdir/src1/b.cpp
> >
> > You would define OBJS like this.
> >
> > OBJS = $(addprefix $(OBJDIR)/, $(SRCS:.cpp=.obj))
> >
> > I assume that the object directory is dynamically created or, at least
> > that you don't have the same directory structure there that you have in
> > your source directory.  You can overcome this as follows.  The following
> > is a modified version of your test makefile which implements this
> > suggestion.
> >
> > OBJDIR = objdir
> > OBJSUBDIRS = $(addprefix $(OBJDIR)/,$(dir $(SRCS)))
> > SRCS = a.cpp \
> >       src1/b.cpp
> > OBJS = $(addprefix $(OBJDIR)/,$(SRCS:.cpp=.obj))
> >
> > all: $(OBJS)
> >
> > $(OBJDIR) $(OBJSUBDIRS):
> >         mkdir -p $(@)
> >
> > $(OBJDIR)/%.obj: %.cpp | $(OBJDIR) $(OBJSUBDIRS)
> >         g++ -o $@ -c $<
> >
> > --
> > Ken Smith
>
>
>
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