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With any optimization level above -O0, gcc 4.7 optimizes out everything except the calls to printf. I checked the assembly code and it's just two calls to printf. So gcc's compile-time evaluation is not detecting the uninitialized value. And valgrind has no chance to detect it at runtime since it's only two calls to printf with constant arguments.

Colin D Bennett
– Colin D Bennett

2014-10-07 22:06:17 +00:00
Commented Oct 7, 2014 at 22:06

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