Are the three main compiler flavors supported by Xcode (gcc 4.0, 4.2, and llvm) binary-compatible with one another? What kind of gotchas and corner cases should I be aware of when bringing a multi-library project up to speed with the most recent Xcode tools?
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Clang is ABI-compatible with code generated by gcc. Clang also includes experimental support for some newer Objective-C ABIs, but compiling for the newer ABI requires flags, and generated code can be mixed with GCC-generated code anyway.
mipadi
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3Is clang's C++ ABI compatible with g++? – osgx Jan 18 '12 at 02:54
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clang is a c++ compiler :) – cubuspl42 Mar 12 '13 at 18:34
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clang++ is a C++ compiler. A more recent answer on the duplicate question http://stackoverflow.com/questions/11682748/is-clang-abi-same-as-g explains that for C++ there does not seem to be a commitment to full ABI compatibility. – andybuckley Apr 23 '14 at 09:53
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A minor gotcha is that if you want to compile PowerPC code that will run on a G3, you must use GCC 4.0.
JWWalker
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Thanks for the tip; we won't need to compile PPC unless Apple returns to it, but good to know in general. – fbrereto Sep 09 '10 at 16:56