Comeau C/C++ compiler attempts to level the playing field across different platforms and compilers.  It takes CeeLanguage/CeePlusPlus source as input, and outputs different C/C++ source that is customized to the platform/compiler in use.  This way, you can write the code once and not have to worry about portability issues that always come up between different compilers.

It is available from http://www.comeaucomputing.com/
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CategoryCee CategoryCpp