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Message: [QUOTE="Keith Thompson, post: 2453178"] Just to be clear, you're saying that developing a validation suite is vastly more expensive than developing a C implementation? [...] Since the standard allows extensions, extensions shouldn't cause any tests to fail. If no existing compilers conform to C99, then all compilers will fail some tests; that's the whole point of a test suite. (Knowing *which* tests fail could still be useful.) If you want to invoke a compiler in purely standard C, system() is the only way to do it. I wasn't suggesting that the framework needs to be in purely standard C. A lot, presumably. [/QUOTE]