RE: Problem with static pattern rules and full path

[Norman Wilson]

If you are building out of tree - ie you have a separate src_root and
bld_root - then you can say:

$(bld_root)/%.o : $(src_root)/%.o

Where src_root is the root of the source directory hierarchy and
bld_root is the root of a parallel hierarchy for the build products.
This works so long as your targets are expressed as full paths. So say
you're linking a library with a list of .o files. If you specify the
full paths to the .o files make will work out the dependencies to the
.cpp files so long as they are in a corresponding location in the source
tree. To be more explicit, assuming src_root := /src and bld_root :=
/bld, the above rule will match the following:

/bld/foo/bar.o : /src/foo/bar.cpp

/bld/wibble/wah.o : /src/wibble/wah.cpp

etc

This will not work if you want to put all your .o files in the same
directory. However I don't think this is a very good idea anyway.

> -----Original Message-----
> From: address@hidden 
> [mailto:address@hidden On 
> Behalf Of Dale King
> Sent: 30 September 2005 04:30
> Cc: address@hidden
> Subject: Re: Problem with static pattern rules and full path
> 
> Paul D. Smith wrote:
> 
> >%% address@hidden writes:
> >
> >  >> >> vpath $(prefix)/%.c ...
> >
> >  >> >> where the prefix variable restricts the values to match the
> >  >> >> "current" location, whatever that is.
> >
> >  dk> That doesn't seem to work either.
> >
> >  >> It will definitely work, if you can compute the proper value of
> >  >> prefix.  Which you may not be able to do, depending on your
> >  >> environment.
> >
> >  d> # This comes from one directory's included makefile
> >  d> objdir := /obj1
> >  d> srcs := a.c
> >  d> src-dirs := /foo
> >
> >  d> # This is the generic rules that cannot be directory specific
> >  d> objs := $(addprefix $(objdir)/,$(notdir $(srcs:.c=.o)))
> >  d> vpath $(objdir)/%.c $(src-dirs)
> >
> >Er... of course this won't work.  The .c file isn't in 
> $(objdir), so it
> >will never match the pattern $(objdir)/%.c.
> >
> >You have to use the source directories in the pattern for 
> the .c files.
> >
> >
> >The idea is to use a prefix that is "above" the source 
> directories.  As
> >I said above, depending on your environment this might be 
> difficult or
> >even impossible.
> >  
> >
> Given the constraints I have already given then, it looks 
> like this is 
> impossible. I have no clue what the prefix would be because the files 
> come from a variable set by the owner of a particular 
> directory in the 
> tree and can point anywhere (including outside of the tree).
> 
> I'll go back to evaluating replacing make with scons, now.
> 
> 
> 
> _______________________________________________
> Help-make mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/help-make
> 
> 


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