https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85348
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
CC| |msebor at gcc dot gnu.org
--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
I think the -Wpacked-not-aligned warning would work well here. There was a
request some time ago to issue a warning for things like:
struct __attribute__ ((packed)) S {
std::mutex mtx;
...
};
Decorating std::mutex (and other C++ standard library classes that need to be
aligned) with attribute warn_if_not_aligned would trigger the warning.
Alternatively, adding a new #pragma warn_if_not_aligned to effectively annotate
all type definitions in a header with the attribute would avoid having to
modify every class in the C++ standard library to add the attribute explicitly.
Another alternative would be to implicitly reset the #pragma pack on "entry" to
every C++ standard header (or even every header), and restore it on "exit."
