https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90061
Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |INVALID
--- Comment #5 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
One common cause for such issues is taking the address of an under-aligned
field, assigning the misaligned address to a normal 'long *' pointer, and then
trying to access the field via that pointer. Sometimes the compiler propagates
alignment info for such pointers, but in general it can't (the code should use
a typedef for a misaligned pointer).
GCC 9 implemented a new warning, -Waddress-of-packed-member, to catch such
misuse (although sadly it wouldn't trigger here due to #pragma pack, see PR
90452).
Of course without seeing an example it's impossible to say what went wrong.
Closing, please reopen or file a new bug when a testcase is available.
