Hi, I observe that -m64 throws an error on the given configuration: $ touch x.c $ gcc -m64 x.c x.c:1: error: -mlong-double-64 not allowed with -m64 $ gcc -v Using built-in specs. Target: sparc64-unknown-linux Configured with: ../configure --prefix=/usr --infodir=/usr/share/info --mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64 --enable-languages=c,c++,objc,fortran,obj-c++ --enable-checking=release --with-gxx-include-dir=/usr/include/c++/4.4 --enable-ssp --disable-libssp --disable-libgcj --disable-libmudflap --with-slibdir=/lib64 --with-system-zlib --enable-__cxa_atexit --enable-libstdcxx-allocator=new --disable-libstdcxx-pch --enable-version-specific-runtime-libs --program-suffix=-4.4 --enable-linux-futex --without-system-libunwind --with-cpu=ultrasparc --with-long-double-128 --build=sparc64-unknown-linux Thread model: posix gcc version 4.4.1 [gcc-4_4-branch revision 150839] Not specifying -m64 at all, also producing a 64-bit object (by virtue of --with-cpu=ultrasparc I suppose) has no problem: $ gcc -c x.c $ file x.o x.o: ELF 64-bit MSB relocatable, SPARC V9, relaxed memory ordering, version 1 (SYSV), not stripped How can I resolve the error? thanks, Jan
