On Tue, Sep 27, 2016 at 10:13 AM, Jakub Jelinek <ja...@redhat.com> wrote: > On Tue, Sep 27, 2016 at 10:03:10AM +0200, Andreas Schwab wrote: >> This breaks building with gcc-4.3. >> >> g++ -std=gnu++98 -fno-PIE -c -DUSE_LIBUNWIND_EXCEPTIONS -g -DIN_GCC >> -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall >> -Wwrite-strings -Wcast-qual -Wno-format -Wmissing-format-attribute >> -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros >> -Wno-overlength-strings -Wno-implicit-fallthrough -DHAVE_CONFIG_H -I. -I. >> -I../../gcc -I../../gcc/. -I../../gcc/../include >> -I../../gcc/../libcpp/include -I../../gcc/../libdecnumber >> -I../../gcc/../libdecnumber/dpd -I../libdecnumber >> -I../../gcc/../libbacktrace -o insn-emit.o -MT insn-emit.o -MMD -MP -MF >> ./.deps/insn-emit.TPo insn-emit.c >> cc1plus: error: unrecognized command line option "-Wno-implicit-fallthrough" >> make[3]: *** [insn-emit.o] Error 1 > > Guess it must have been some mistake against the policy that unknown -Wno-* > options aren't complained about, unless something else is diagnosed. > > Anyway, Marek, can you add configure check for that?
Existing practice is to instead use -Wno-error rather than warning flags that were not present in those early GCC versions. Richard. > Jakub
