Re: flat OBJDIR

[Ken Smith]

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:
> > Sorry for my previous chaotic mail. I've constructed a simple
> > test case for my problem and hope that someone will comment:
> > 
> > bolinux72:afarber {555} cat Makefile
> > 
> > OBJDIR = objdir
> > SRCS = a.cpp \
> >        src1/b.cpp
> > 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
> this.
> 
> objdir/a.obj
> objdir/src1/b.cpp
correction:
  objdir/src1/b.obj
> 
> 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

-- 
Ken Smith