https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86532
--- Comment #14 from Bernd Edlinger <bernd.edlinger at hotmail dot de> --- (In reply to Martin Sebor from comment #13) > (In reply to Richard Biener from comment #9) > > > > I bet Martin would argue it's invalid ... > > That's right, the example in comment 8 is undefined because strlen() > requires a nul-terminated string argument and a[0] in the call strlen(a[0]) > is not such a string. It's not valid for strlen() to access one subobject > when passed a pointer to another, even if the two are adjacent in memory. > This applies equally to struct members as well as multidimensional arrays. From a security perspective I cannot agree. First the sample generates 0 warnings -Wall and -Wextra Second it generates zero warnings under -fsanitize=address,undefined This is going into slippery terrain.
