https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81437
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> --- (In reply to Martin Sebor from comment #2) > GCC 9 prints the two warnings below with -m64 as well as -m32. GCC 8.2.0 > prints them too but only in LP64 mode. With -m32, it only warns about g. > > $ gcc -O2 -S -Wall -m32 a.c > a.c: In function ‘g’: > a.c:12:3: warning: ‘__builtin_memcpy’ forming offset 5 is out of the bounds > [0, 4] of object ‘a’ with type ‘const char[4]’ [-Warray-bounds] > 12 | __builtin_memcpy (d, a + 4, n); // missing warning > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > a.c:10:14: note: ‘a’ declared here > 10 | const char a[] = "123"; > | ^ > a.c: In function ‘f’: > a.c:5:3: warning: ‘__builtin_memcpy’ forming offset [5, 2147483651] is out > of the bounds [0, 4] of object ‘a’ with type ‘const char[4]’ [-Warray-bounds] > 5 | __builtin_memcpy (d, a + 4, n); // warning (ok) > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > a.c:3:14: note: ‘a’ declared here > 3 | const char a[] = "123"; > | ^ So we're down to just 1 missing warning now then?
