On Thu, 17 Mar 2011, Lisandro Dalcin wrote:

On 16 March 2011 21:00, Barry Smith <[email protected]> wrote:

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On Feb 8, 2011, at 6:31 AM, Jed Brown wrote:

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GCC now ships with the LGPL-licensed libquadmath library, which provides for targets with a __float128 datatype quad-precision mathematical functions. __float128 is available for targets on 32-bit x86, x86-64 and Itanium architectures. The libquadmath library is automatically built on such targets when building the Fortran compiler.

http://gcc.gnu.org/gcc-4.6/changes.html#libquadmath http://gcc.gnu.org/onlinedocs/libquadmath/

Looks like this is something that actually works. GCC-4.6 is probably about two months away from a release, but this should be functional now. Perhaps it should be supported by petsc-3.2?

 Done (use ./configure --with-precision=__float128 --download-qblaslapack

I got an error about "Unknown comression type in URL: http://ftp.mcs.anl.gov/pub/petsc/externalpackages/qblaslapack.gz"... (BTW, the error message has a typo, should be "compression"). The

pushed

trivial fix below solved the issue.. PLEASE PUSH!

pushed satish