Hi, On Thu, 2022-03-10 at 18:06 +0100, Mark Wielaard wrote: > _FORTIFY_SOURCE=3 adds extra glibc (dynamic) fortification checks > when using GCC 12. > > This adds a configure check to see if -D_FORTIFY_SOURCE=3 can be > used. > If not, configure will fall back to -D_FORTIFY_SOURCE=2. > > On some older glibc versions (glibc 2.17) using -D_FORTIFY_SOURCE=3 > provides the same fortification as _FORTIFY_SOURCE=2. On some newer > glibc versions and older GCC (glibc 2.34 amd gcc 11) using > -D_FORTIFY_SOURCE=3 produces a not supported warning (and we fall > back to -D_FORTIFY_SOURCE=2). With newer glibc and newer GCC versions > (glibc 2.35 and gcc 12) -D_FORTIFY_SOURCE=3 will use the newer > dynamic > fortification checks. > > This patch also makes sure that AC_PROG_CXX is used earlier so that > CXXFLAGS is always setup correctly (even if we then don't use it). > And it outputs both the CFLAGS and CXXFLAGS as used at the end.
Pushed. Cheers, Mark
