Merge pull request ceph#64071 from tchaikov/wip-static_ptr-alignas

common/static_ptr: pass an integer to alignas to fix GCC-11 build fai…

Reviewed-by: Casey Bodley <[email protected]>

Author: cbodley

src/common/static_ptr.h

@@ -101,7 +101,8 @@ class static_ptr {
   // difference in semantics between a pointer-to-const and a const
   // pointer.
   //
-  mutable struct alignas(std::bit_ceil(Size)) {
+  static constexpr std::size_t Alignment = std::bit_ceil(Size);
+  mutable struct alignas(Alignment) {
     unsigned char data[sizeof(Base)];
   } buf;