test

C++ User's Guide

Values

t is a comma-separated list that consists of one or more of the following:

Value of t

Meaning 

[no%]division

[Do not] Trap on division by zero. 

[no%]inexact

[Do not] Trap on inexact result. 

[no%]invalid

[Do not] Trap on invalid operation 

[no%]overflow

[Do not] Trap on overflow. 

[no%]underflow

[Do not] Trap on underflow. 

%all

Trap on all of the above. 

%none

Trap on none of the above. 

common

Trap on invalid, division by zero, and overflow. 

Note that the [no%] form of the option is used only to modify the meaning of the %all and common values, and must be used with one of these values, as shown in the example. The [no%] form of the option by itself does not explicitly cause a particular trap to be disabled.

If you wish to enable the IEEE traps, -ftrap=common is the recommended setting.