handle isl and cloog in contrib/download_prerequisites

Manuel López-Ibáñez lopezibanez@gmail.com
Sat Oct 6 17:30:00 GMT 2012


Hi,

GCC now requires ISL and a very new CLOOG but download_prerequisites
does not download those. Also, there is only one sensible place to
call this script from, so check for that. Also, factorize a bit the
code.

Tested by using it in the the GCC Compile Farm. I tried to build and
install CLOOG and ISL by myself into /opt/cfarm/ but that breaks in
some strange ways. Using the script, bootstrap works just fine.

In some dream universe, configure would detect that the prerequisites
are missing or incorrect very early, give a sensible message and
suggest to download them automatically, and then just do that.

OK for trunk?

Cheers,

Manuel.
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