Akio Nakamura 2eb5036c33 macOS: Prevent Xcode 9.3 build warnings ...

This PR solves #12867 (needs to run autogen.sh && ./configure)

clang (Apple LLVM version 9.1.0 (clang-902.0.39.1)) warns unused
argument '-pie' during compilation.
So we check for warnings in the test using $CXXFLAG_WERROR.

Windows is alse default-pie and was special-cased because it also
warned, but we can also eliminate that case if warnings are caught.

2018-04-13 10:26:05 +09:00

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