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Updating top-level autoconf to 2.59

All of the subtrees in the GCC and Src trees have been updated to use
autoconf 2.59 and now that GCC 4.2 has branched I think it is time to
update the toplevel configure script to use 2.59 too.  I came up with
the attached patch but I found that when I set (and exported) CC and
then ran the GCC configure & make my build of libstdc++ failed because
the build of the libstdc++ library was using my original bootstrap CC
(the one used to build the new compiler) instead of the newly built g++
like it does now.  Does this problem sound familiar to anyone?  Does
anyone know how to fix it?

If I set CC on the configure command line (instead of setting an
environment variable before calling configure) it appeared to work but I
don't think that that is what should be happening.

Steve Ellcey

Here is the patch I was trying:

---	(revision 119559)
+++	(working copy)
@@ -21,10 +21,12 @@
 # Get 'install' or 'install-sh' and its variants.

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