message: build: Enable unreachable-code-loop-increment
  Enable unreachable-code-loop-increment and treat as error.
  refs:
diff: @@ -396,6 +396,7 @@ if test "x$enable_werror" = "xyes"; then
  dnl https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78010
  AX_CHECK_COMPILE_FLAG([-Werror=suggest-override],[ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror=suggest-override"],,[[$CXXFLAG_WERROR]],
  [AC_LANG_SOURCE([[struct A { virtual void f(); }; struct B : A { void f() final; };]])])
  + AX_CHECK_COMPILE_FLAG([-Werror=unreachable-code-loop-increment],[ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror=unreachable-code-loop-increment"],,[[$CXXFLAG_WERROR]])
  fi
  if test "x$CXXFLAGS_overridden" = "xno"; then
  @@ -415,6 +416,7 @@ if test "x$CXXFLAGS_overridden" = "xno"; then
  AX_CHECK_COMPILE_FLAG([-Wsign-compare],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wsign-compare"],,[[$CXXFLAG_WERROR]])
  AX_CHECK_COMPILE_FLAG([-Wsuggest-override],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wsuggest-override"],,[[$CXXFLAG_WERROR]],
  [AC_LANG_SOURCE([[struct A { virtual void f(); }; struct B : A { void f() final; };]])])
  + AX_CHECK_COMPILE_FLAG([-Wunreachable-code-loop-increment],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wunreachable-code-loop-increment"],,[[$CXXFLAG_WERROR]])
  dnl Some compilers (gcc) ignore unknown -Wno-* options, but warn about all
  dnl unknown options if any other warning is produced. Test the -Wfoo case, and
  