安装高版本GCC

转自这里

1. Download the latest GCC from http://gcc.gnu.org/
2. Untar the package
3. If you don’t have prerequisites for GCC, you need to the following steps:
   • Go to the source directory.
   • Do ./contrib/download_prerequisites.
4. Ceate a new directory called “gcc-build” peer to the source directory.
5. In “gcc-build”, perform ../gcc-XXX/configure –prefix=YYY
6. Do make and make install
7. Add “YYY/lib” or “YYY/lib64” into your LD_LIBRARY_PATH and LD_RUN_PATH