Hi Mathias, Grahame, Mathias Fröhlich writes:
> Good morning, > > On Monday 04 April 2011, Grahame Bowland wrote: >> `__sync_bool_compare_and_swap_4' src.cxx:(.text+0x78): undefined reference >> to `__sync_bool_compare_and_swap_4' collect2: ld returned 1 exit status >> gmake[1]: *** [cmTryCompileExec] Error 1 >> gmake: *** [cmTryCompileExec/fast] Error 2 >> >> It does seem the builtins are disabled. As Alberto said probably because >> they're not available for the default 32-bit compiler target, Here's the >> 'g++ -v' output: >> >> Using built-in specs. >> Target: i686-pc-linux-gnu >> Configured with: ./configure --prefix=/opt/gcc-4.4.3 >> --with-mpfr=/opt/mpfr-2.3.2 --enable-languages=c,c++,objc Thread model: >> posix >> gcc version 4.4.3 (GCC) > > There is a configure time switch in gcc that changes the default > architecture. > Distributions usually have their compiler configured for something that > includes support for atomics. But your hand configured gcc uses the really > conservative i386 (not i486, really 80386) default which did not have any smp > support at this very old time. > So either give -march=i686 or something sensible for your project to the c > and > c++ flags when doing the cmake configure step. Or rebuild gcc with the > configure flag --with-cpu=i686 or something sensible for your build > environment. Then rebuild osg from scratch. I agree; if you are only going to use that OSG version with the same computer or with another having the same or later CPU, maybe the easiest way is to use -march=native as I said earlier. If you are not sure about what kind of processors are going to run the code, you'll have to find a common base architecture like the one suggested by Mathias, -march=i686. There is a comprehensive list at http://gcc.gnu.org/onlinedocs/gcc-4.4.5/gcc/i386-and-x86_002d64-Options.html#i386-and-x86_002d64-Options Again, please note that this will enforce a constraint on the minimum CPU requirement for the systems running your software. -- Alberto _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
