top_srcdir when running configure?

[Michael J. Barillier]

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As part of running `configure' I would like to generate some values to
be used/substituted in a Makefile.  Specifically, I want to get some
Oracle compile and link flags using an auxillary Makefile containing
something similar to:

  config:
          @echo 'ORACLE_CFLAGS=$(CFLAGS)'
          @echo 'ORACLE_LDFLAGS=-L$(LIBDIR) $(PROLDLIBS)'

  include $(ORACLE_HOME)/precomp/lib/env_precomp.mk

`env_precomp.mk' contains a slew of useful definitions and, since I
can't include the file directly in Makefile/Makefile.am (there are
some values in there that I believe would muck up the generated
Makefile) I would like to do something like the following in
configure.ac:

  ORACLE_CFLAGS=`make -f "$ac_top_srcdir/config/oracle.mk" config |
    grep -E '^ORACLE_CFLAGS=' | sed -e 's/^[^=]*=//`
  AC_SUBST(ORACLE_CFLAGS)

and then use address@hidden@' in Makefile.am.  Unfortunately,
`$ac_top_srcdir' isn't available until config.status is run, but I
need (?) to get the root of the source directory at configure time to
determine the absolute location of oracle.mk (which contains the first
snippet of code).

So: How can I figure out where the code is when configure is run
(without duplicating the code used to calculate ac_top_srcdir), or is
there a better generic solution?

TIA

- -- 
Michael J. Barillier mbarilli(at)midsouth.rr.com  /"\ ASCII Ribbon
Reg Linux user #125310 <http://counter.li.org/>   \ / Campaign against
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