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Replace alignment_of_long_double with C11 alignof #12658

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Replace alignment_of_long_double with C11 alignof #12658

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Commits on Jul 9, 2024

  1. Replace alignment_of_long_double with C11 alignof if possible 

    This removes a static variable in a static function and uses
C11 `alignof` instead to get a compile-time value. Since we don't
currently require C11 we keep the old implementation as fallback.

Also fixes this compiler warning:

```
opal_copy_functions_heterogeneous.c:495:1: warning: function declaration isn't a prototype [-Wstrict-prototypes]
  495 | alignment_of_long_double() {
      | ^~~~~~~~~~~~~~~~~~~~~~~~
```
by adding `void` as parameter.

Signed-off-by: Joseph Schuchart <[email protected]>
    @devreal
    devreal committed Jul 9, 2024
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