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Remove usage of deprecated ATOMIC_VAR_INIT() macro

Ondřej Surý requested to merge ondrej/remove-ATOMIC_VAR_INIT-v9_18 into v9_18

The C17 standard deprecated ATOMIC_VAR_INIT() macro (see [1]). Follow the suite and remove the ATOMIC_VAR_INIT() usage in favor of simple assignment of the value as this is what all supported stdatomic.h implementations do anyway:

  • MacOSX.plaform: #define ATOMIC_VAR_INIT(__v) {__v}
  • Gcc stdatomic.h: #define ATOMIC_VAR_INIT(VALUE) (VALUE)
  1. http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1138r0.pdf

(cherry picked from commit f251d69e)

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