Cmake errors of installing ccons
===

after execute `cmake CMakeLists.txt`

it seems give no errors,

then I do make, it gives me the following error:

    :/usr/local/src/llvm-3.1.src/tools/ccons$ sudo make
    [  7%] Building CXX object CMakeFiles/ccons.dir/ccons.cpp.o
    /usr/local/src/llvm-3.1.src/tools/ccons/ccons.cpp:1:0: error: bad value (x86_64) for -march= swi
    tch
    make[2]: *** [CMakeFiles/ccons.dir/ccons.cpp.o] Error 1
    make[1]: *** [CMakeFiles/ccons.dir/all] Error 2
    make: *** [all] Error 2

Is there anyway to figure out how to solve this?