Question about use of $(wildcard) and $(foreach)

[Rick Flower]

Hi all..

I've got some existing makefiles I'm trying to simplify and we've got a 
legacy source tree that has different possible locations for the objects 
to be placed after compilation occurs depending on location within the 
directory tree, and platform selected, processor, etc.. Our old 
Makefiles used a combination of flags to determine where to place the 
objects properly.. While it worked fine, it was very busy to look at and 
used 40-50 lines to achieve that.

I took a different approach and listed all of the possible paths in a 
variable called "OBJDIRS" and wanted to write some makefile 'code' that 
could pick out the only one that exists for the directory tree where 
Make was invoked from.. Below is what I was trying but found that it 
would only return a valid OBJDIR when the valid directory was at the end 
of the list (IIRC) or other odd conditions:

OBJDIR =
OBJDIRS := \
           ../../${proc}/obj/${target) \
           ../../${target}/obj \
           ../../obj/${target}

find_files  = $(if $(wildcard $(dir)),OBJDIR=${dir})
OBJDIR := $(foreach dir,$(OBJDIRS),$(find_files))

In my example, my source tree where the Makefile is invoked is something 
like the following..
~/bydir/build1/base-src/os/src/common

and the objects should end up in :
~/bydir/build1/base-src/os/obj/sun

I'm hoping that Make could look at all of the directories listed in 
OBJDIRS and pickout the only valid one that exists (in this case the 
directory would be "../../obj/sun")..  What am I missing to make this 
work or am I expecting too much?

Thanks!