Chet Ramey wrote: > I wish we didn't have to worry > about checking for gcc features that were introduced 15 years ago.
Indeed, gcc 4.4 was released 15 years ago (!). Nonetheless, GNU Gnulib has an Autoconf macro that tests whether a compiler option is actually supported by the compiler, before adding it to CFLAGS: https://www.gnu.org/software/gnulib/manual/html_node/warnings.html You may want to use it... Bruno
