Re: flat OBJDIR

[Ken Smith]

On Tue, Aug 24, 2004 at 04:35:33PM +0000, 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:

I cut and pasted the the makefile into the email and cut and pasted it
back out (tabifying the mkdir and g++ which autoconverted to spaces).
Here is a transcript of my session.  My suspicion is that you do not
have an "a.cpp" in the directory containing the test makefile.

---Transcript---
% cat Makefile 
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 $<

% cat a.cpp
#include "a.hpp"

a::a() {}
a::~a() {}
% cat a.hpp
class a
{
        public:
                a();
                ~a();
};
% cat src1/b.cpp 
#include "b.hpp"

b::b() {}
b::~b() {}
% cat src1/b.hpp 
class b
{
        public:
                b();
                ~b();
};
% gmake
mkdir -p objdir
mkdir -p objdir/src1
g++ -o objdir/a.obj -c a.cpp
g++ -o objdir/src1/b.obj -c src1/b.cpp
----------------

> 
> 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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-- 
Ken Smith