script to map TARGET to sysdeps subdirectory?

["Robert P. J. Day" <rpjday at mindspring dot com>]

  looking at a segment of the contributed NPTL patch file
"crosstool-0.38-nptl-schaefer.patch", it's obvious that a chunk of
that file simply maps the TARGET variable to the corresponding
"sysdeps/" subdirectory when trying to figure out which version of
wordsize.h to copy over (hacked excerpt of patch file follows):

case $TARGET in
+        sparc* | s390* | powerpc* )
+            case $TARGET in
+            sparc64* )
		wordsize_h=sysdeps/sparc/sparc64/bits/wordsize.h
+                        ;;
+            sparc* )
		wordsize_h=sysdeps/sparc/sparc32/bits/wordsize.h
+                        ;;
+            s390x* )
		wordsize_h=sysdeps/s390/s390x/bits/wordsize.h
+                        ;;
+            s390* )
		wordsize_h=sysdeps/s390/s390/bits/wordsize.h
+                        ;;
+            powerpc64* )
		wordsize_h=sysdeps/powerpc/powerpc64/bits/wordsize.h
...

to make things way simpler (not just here but elsewhere), is there no
script along the lines of, say, config.guess or config.sub that will
take a TARGET and map it to that TARGET's corresponding sysdeps
subdirectory?  after all, that's really all the above is doing in
trying to process wordsize.h.  surely that script can't be hard to
write (if it doesn't exist already).

rday

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