Richard Homolka writes: > Thanks andrew > > > >From: Andrew Haley <aph@xxxxxxxxxx> > >To: "Richard Homolka" <rhomolka@xxxxxxxxxxx> > >CC: gcc-help@xxxxxxxxxxx > >Richard Homolka writes: > > > Hello, i just built gcc 4.1.0 from sources. I'd like to be able to > >target > > > both 32 bit and 64 bit apps. I try to add the -m64 flag to a compile > >though > > > and i get: > > > hello.c:1: sorry, unimplemented: 64-bit mode not compiled in > > > > > > what did i do wrong in the build? i didn't see anything about > >targetting > > > multiple configs. > > > My configure command is: > > > ../gcc-4.*/configure \ > > > --prefix=/tp/tools/gcc/4.1.0 \ > > > --enable-shared \ > > > --enable-threads \ > > > --enable-tls \ > > > --with-arch=pentium3 \ > > > >What's this for? Take it out. > wanted to have default arch flags for our builds. is this affecting the gcc > build, or just it's defualt flags? It doesn't make sense. Pentium 3 is 32-bit. > > > --with-tune=pentium4 \ > > > --enable-__cxa_atexit \ > > > --enable-languages=c,c++,fortran \ > > > --disable-nls \ > > > --with-gmp=$GMPDIR \ > > > --with-mpfr=$MPFRDIR > > > > > > any tips? thank you > > > >What does `uname -a' say? > taserv@lx-chtasglab4$: uname -a > Linux lx-chtasglab4.wfg.com 2.4.21-32.0.1.ELhugemem #1 SMP Tue May 17 > 17:43:22 EDT 2005 i686 i686 i386 GNU/Linux You seem to be running a 32-bit operating system. As a consequence of that, you only have 32-bit libraries and 32-bit headers. This means gcc can't generate 64-bit programs becasue it's got no way of linking them. I suggest you install a 64-bit OS. Then you can use 32-bit and 64-bit libraries. > >What did the first 20 or so lines of the > >configure output look like? > creating cache ./config.cache > checking host system type... i686-pc-linux-gnu > checking target system type... i686-pc-linux-gnu > checking build system type... i686-pc-linux-gnu This is 32-bit only. Now, it is possible to build a 32-bit to 64-bit cross compiler. To do that, if you really want to do it, you'll need to get a set of 64-bit libraries and headers from somwhere and build a x86_64 cross-compiler. I don't encourage you to do this. Andrew.
