collares added a comment. It is worth noting that GCC started assuming 16-byte alignment for small objects in 2016, before N2293 was written and accepted into C2x; see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90569#c8 and https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90569#c9 for more recent (informal) statements from GCC developers. Other malloc implementations, such as tcmalloc (see https://google.github.io/tcmalloc/reference.html) also seem to be planning on relaxing the alignment assumptions once C2x compliance is widespread. It might be worth filing a GCC bug as well.
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