free c++ compiler for mac with open source license [closed]

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Are there any free c++ compilers for macs whose license is open source? (basically one of these http://www.opensource.org/licenses/category)

I don't have the DVD that came with my current OS, and it won't run the version of xcode I already have.

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GCC and Clang+LLVM are both open source C++ compilers.

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just the gcc compiler suite, it includes g++ which is an open source compiler.