On Tue, Mar 17, 2020 at 8:11 PM Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > > On Tue, 17 Mar 2020 at 22:15, Jeffrey Walton via Gcc-help > <gcc-help@xxxxxxxxxxx> wrote: > > > > I'm trying to test for availability of _FORTIFY_SOURCE=2. > > What does that mean? I'm trying to determine if the compiler supports FORTIFY_SOURCE. When _FORTIFY_SOURCE=2 is used, *_chk functions are used when the compiler can determine the destination buffer size. Effectively the compiler inserts those Microsoft safer functions that the libc folks rejected. I think it is related to object size checking. Jeff
