Are you trying to compile gmp with sun studio and --enable-cxx? Even if you
manage (there were patches on the gmp mailing list after 4.2.1 came out), there
is no point, it won't pass make check because of bugs in the compiler that have
not been fixed yet. What software do you need that requires gmpxx and not only
gmp? And if you only need gmp, then there is no issue compiling it with gcc,
which gives better performance (the optimized version of the gmp code is
enabled only for gcc because it uses inline assembly that sun studio cannot
understand (yet)).
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