See http://websympa.loria.fr/wwsympa/arc/mpfr/2009-07/msg00031.html and the following discussion.
This was on t2.math.washington.edu with /usr/local/gcc-4.4.0-sun-linker/bin/gcc: zimme...@t2:/tmp/mpfr-2.4.1$ /usr/local/gcc-4.4.0-sun-linker/bin/gcc -v Using built-in specs. Target: sparc-sun-solaris2.10 Configured with: /home/kirkby/gcc-4.4.0/configure CC=/usr/sfw/bin/gcc --prefix=/usr/local/gcc-4.4.0-sun-linker --without-gnu-as --without-gnu-ld --with-as=/usr/ccs/bin/as --with-ld=/usr/ccs/bin/ld --enable-languages=c,c++,fortran --with-mpfr-lib=/usr/local/lib --with-mpfr-include=/usr/local/include --with-gmp-include=/usr/local/include --with-gmp-lib=/usr/local/lib --with-libiconv-prefix=/usr/lib/iconv Thread model: posix gcc version 4.4.0 (GCC) -- Summary: gcc 4.4.0 miscompiles mpfr-2.4.1 Product: gcc Version: 4.4.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: zimmerma+gcc at loria dot fr GCC build triplet: sparc-sun-solaris2.10 GCC host triplet: sparc-sun-solaris2.10 GCC target triplet: sparc-sun-solaris2.10 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40757