Don't have a machine to play with here, but 64 bit perl on Solaris in perlsolaris says:

Long Doubles.

As of 5.8.1, long doubles are working if you use the Sun compilers (needed for additional math routines not included in libm).

Given that your issue appears to be a single/double precision float mismatch, have you tried building with the Sun compilers? When you modified the compile and link commands, could you have missed a line, s.t. some libraries were built without the -m64 flag?

In reply to Re: 64-bit build fails numeric tests by kennethk
in thread 64-bit build fails numeric tests by eshafto

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