Re: how well does multi-arch build handle recursive building?

[Johan Bezem]

Robert P. J. Day wrote:
> ...
> but how does the multi-arch approach work if one tries to extend it to
> a recursive make structure?  you know -- the kind where part of the
> top-level makefile defines a number of SUBDIRS and reinvokes make with
> "make -C" for each of those SUBDIRS?
>
> if you're trying to emulate the original recursive build, that would
> seem to mean that, for each sub-directory you move into, you need to
> redefine vpath to the corresponding sub-directory for the sources, no?

yes, in my personal system, this is true. My command line to initiate a 
recursive call of make looks like this (all one line):
  address@hidden(MAKE) --directory=$(YT_OBJBASE)/$@/$(YT_OBJDIR_SUFFIX)
  YT_SRCVPATH=$(YT_SRCVPATH)/$@ YT_OBJBASE=$(YT_OBJBASE)/$@
  YT_TARGETNAME=$@ -f $(YT_SRCVPATH)/$@/Makefile --no-print-directory
  $(MAKECMDGOALS)

$@ is the next directory, because I have defined the directories being 
targets; OBJBASE represents the root of the object's tree, OBJDIR_SUFFIX 
contains the version (multiple compilers, versions, debug/release, etc); 
SRCVPATH is used to set the VPATH/vpath in the next recursion.

Furthermore, I determine the directories to recurse through 
automatically, by looking for 'Makefile' in each subdirectory of the 
current one, and offer the possibility of creating libraries for each 
subdirectory, or "copy-down" all objects of one directory level to its 
parent's level.

BUT: All makefiles in all directories are two-liners, just including a 
common makefile from a central location. All the rest is automatically 
inferred, unless you (as "make-man") want something special. But then 
the single makefiles may expand beyond the default two-liner also.
And BTW: This structure runs on Solaris, Linux and Windows/Cygwin all 
the same.

Does this make sense to you? At least I hope this helps somewhat.

Johan Bezem
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