HP UX Fortran Software Signals recognized by the +fpexception option, Gformat77, +hugecommon

Table 10 Values for the +FP option (continued)

Value Meaning

ITrap on floating-point operations that produce inexact results. Inexact result traps may occur whenever roundoff is necessary to produce the result. For example, the fraction 1.0/3.0 produces an inexact trap because there is no exact floating-point representation for this fraction.

DEnable sudden underflow (flush to zero) of denormalized values on those PA-RISC systems greater than version 1.0 that have implemented sudden underflow. (That is, +FPD enables sudden underflow only if it is available on the processor that is used at run time.) Denormalized values are those values whose absolute value is very close to zero. For IEEE single precision data types, the largest denormalized value is approximately equal to 2-126. For IEEE double precision data types, such values are approximately equal to 2 -1022. Sudden underflow will cause some floating-point applications to run faster, with a possible loss of numerical accuracy on numbers very close to zero.

+[no]fp_exception +fp_exceptionis a compile time flag. It causes a descriptive message and a procedure traceback to be issued to standard error when the HP-UX signals listed in Table 2-5 are generated.

For a description of these signals, see signal(2) and signal(5) in the HP-UX Reference. For information about floating-point exceptions and error handling, see the HP-UXFloating-Point Guide.

You can also use the ON statement to write your own trap procedures. For information about the syntax of the ON statement, see “Using the ON statement” (page 81).

The default,+nofp_exception , disables traceback information.

Table 11 Signals recognized by the +fp_exception option

Signal	Meaning
SIGILL	Illegal instruction
SIGFPE	Floating-point exception
SIGBUS	Bus error instruction
SIGSEGV	Segmentation violation
SIGSYS	Bad argument to system call
-g	-gcauses the compiler to generate information for use by the HP WDB debugger. The -goption
	can be used to prepare code for debugging that has been compiled with optimization
	options-O,-O1/+O1, , but not O3/+O3or higher.
-G	+getarg0and +getarg1control the behavior of the getarg intrinsic subroutine. +getarg0
	requests the industry standard behavior for getarg, where an index value of zero causes the
	program name to be returned. HP’s FORTRAN 77 getarg intrinsic also implements this industry
	standard convention. +getarg1is used to request non-standard behavior, where an index value
	of one causes the program name to be returned (older releases of HP Fortran behaved in this
	manner). The default is +getarg0.
gformat77	gformat77 requests the FORTRAN 77 style of formatting a value of zero with the G edit
	descriptor. Fortran 90 uses an F edit descriptor when the value being written is zero, while
	FORTRAN 77 uses an E edit descriptor.
+[no]gprof	+gprof prepares object code files for profiling with gprof. The default is +nogprof. gprofis
	provided as part of the “HP-UX General Programming Tools” product; see gprof(1). The
	-Goption can be used to perform the same function as +gprof.
+hugecommon	+hugecommon instructs the compiler to place the specified COMMON block into a huge data
	segment. The format for this option is: +hugecommon=name
	where name is the name of a COMMON block. By default, only COMMON blocks larger than
	2 gigabytes are placed into huge data segments.
	For example:

28 Compiling and linking