> > > Dear GCC developers/experts: > > I need to compile gcc from source on a 64 bit linux OS (Ubuntu and > OpenSuSE). After scanning through the installation procedures and > manual, it is not clear to me how to do this on a 64 bit OS (default > seems to be for 32 bit OS, using -m32). It will be highly appreciated > if you can shed some light on this. Thanks! http://gcc.gnu.org/gcc-4.2/changes.html New Targets and Target Specific Improvements IA-32/x86-64 -mtune=generic can now be used to generate code running well on common x86 chips. This includes AMD Athlon, AMD Opteron, Intel Pentium-M, Intel Pentium 4 and Intel Core 2. -mtune=native and -march=native will produce code optimized for the host architecture as detected using the cpuid instruction. Added a new command-line option -fstackrealign and and __attribute__ ((force_align_arg_pointer)) to realign the stack at runtime. This allows functions compiled with a vector-aligned stack to be invoked from legacy objects that keep only word-alignment. I'm in the 64-bit Solaris world and a -m64 would work neatly. Maybe even some -xarch or cpu specific target options. Then again, you're in the linux land where anything can and will happen. Are you thinking of working with GCC 4.2.2 or GCC 4.2.1 ? I have yet to see GCC 4.2.2 build cleanly on a 64-bit OS but GCC 4.2.1 does. see the bottom of http://gcc.gnu.org/gcc-4.2/buildstat.html where there are a few x86_64-unknown-linux-gnu entries. Merry Christmas. Dennis
