diff options
Diffstat (limited to 'gcc/fortran/invoke.texi')
| -rw-r--r-- | gcc/fortran/invoke.texi | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/fortran/invoke.texi b/gcc/fortran/invoke.texi index 38150b1..10387e3 100644 --- a/gcc/fortran/invoke.texi +++ b/gcc/fortran/invoke.texi @@ -1294,7 +1294,8 @@ Specify a list of floating point exception traps to enable. On most systems, if a floating point exception occurs and the trap for that exception is enabled, a SIGFPE signal will be sent and the program being aborted, producing a core file useful for debugging. @var{list} -is a (possibly empty) comma-separated list of the following +is a (possibly empty) comma-separated list of either @samp{none} (to +clear the set of exceptions to be trapped), or of the following exceptions: @samp{invalid} (invalid floating point operation, such as @code{SQRT(-1.0)}), @samp{zero} (division by zero), @samp{overflow} (overflow in a floating point operation), @samp{underflow} (underflow @@ -1314,7 +1315,8 @@ 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},@var{list2}. -Note that once enabled an exception cannot be disabled (no negative form). +Note that once enabled an exception cannot be disabled (no negative form), +except by clearing all traps by specifying @samp{none}. Many, if not most, floating point operations incur loss of precision due to rounding, and hence the @code{ffpe-trap=inexact} is likely to |