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e0bd879a4e
GCC does not provide __has_feature, and its preprocessor tokenizes both
operands of && before evaluating the operator, so
#if defined(__SANITIZE_ADDRESS__) || defined(__has_feature) && __has_feature(address_sanitizer)
failed to compile with 'missing binary operator before token "("' on
toolchains such as the voxl2 linaro GCC. Add the standard __has_feature
fallback shim so the check uses __SANITIZE_ADDRESS__ on GCC and the real
__has_feature on Clang. Behavior is unchanged.
Signed-off-by: Julian Oes <julian@oes.ch>