@@ -1203,6 +1203,12 @@ The first three exceptions (@samp{invali
has provisions for dealing with these exceptions, enabling traps for
these three exceptions is probably a good idea.
+If the option is used more than once in the command line, the lists will
+be joined: '@code{ffpe-trap=}@var{list1} @code{ffpe-trap=}@var{list2}'
+is equivalent to @code{ffpe-trap=}@var{list1,list2}.
+
+Note that once enabled an exception cannot be disabled (no negative form).
+
Many, if not most, floating point operations incur loss of precision
due to rounding, and hence the @code{ffpe-trap=inexact} is likely to
be uninteresting in practice.
@@ -1218,6 +1224,9 @@ of the following exceptions: @samp{inval
@samp{underflow}, @samp{inexact} and @samp{denormal}. (See
@option{-ffpe-trap} for a description of the exceptions.)
+If the option is used more than once in the command line, only the
+last one will be used.
+
By default, a summary for all exceptions but @samp{inexact} is shown.
@item -fno-backtrace