Many people don't realize that the Oracle Studio compilers and tools are now free downloads, and there are many articles and detailed documentation on the developer sites.
In particular, there is often no need to use gcc anymore. Oracle Studio C, C++ and Fortran 2000 compilers are state of the art, and free downloads.
Oracle Studio 12 has just been released and is also free. C/C++/Fortran compilers, debugger, performance analyzer, and Oracle Performance Library. See
Oracle Studio: Home of the C, C++ and FORTRAN Compilers and Tools
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