On Tue, Mar 17, 2020 at 5:16 PM Jeffrey Walton via Gcc-help <gcc-help@xxxxxxxxxxx> wrote: > 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. Then that is how you test for it in a configure script. Just write a trivial program that will generate a call to a *_chk function if _FORTIFY_SOURCE=2 is supported, compile it, and then check for that, either by greping the assembly source or running nm on the object file. Jim
