HP UX Fortran Software manual +io77, Ipo, +nocheckuf, +nolibs, +Onooptimization

Table 14 (continued)

	none	none of the heap variables
	save	variables having save attribute
	A combination of different type of heap variables can be specified by
	colon separated values, like +initheap_set=common:module:save
	The default is +initheap_set=none
+io77	Suppresses the generation of the optional leading “0” before the decimal
	point for real numbers printed with the E and F edit descriptors. Fortran
	77 suppressed these leading zeros unless the NOSTANDARDIOflag was
	used.
-ipo	This option is only valid for Itanium	processor family architectures.
	Enables interprocedural optimizations across files. Object files produced
	using this option contain intermediate code in IELF format. At link time,
	ld automatically invokes the interprocedural optimizer u2comp if any
	of the input object files is an IELF file. This option is ignored at
	optimization levels +O1 and +O2. It is enabled by default when +O4
	or+O faster are used.
+k	+k generates code for programs that reference a very large number of
	shared data items. The linker will issue a diagnostic message in the rare
	case when this option is needed. By default, the compiler generates
	short-displacement code sequences for programs that reference global
	data in shared libraries. For nearly all programs, this is sufficient.

NOTE: +koption is not valid on HP Itanium®-based systems.

+nocheckuf	+nocheckuf disables the OPEN statement error check for opening text files with
	ACCESS=”sequential”, FORM=” unformatted”. This option is useful only when
	BUFFERIN/BUFFEROUT statements will be used to access the opened unit. The main program
	must be compiled with this option for it to have any effect, and all OPEN statements will then
	skip this error check.
+nolibs	Disables the passing of libraries to the linker. This is useful when symbols are resolved at runtime
	through dynamically loaded libraries.

+nopadsharedcommon Do not pad shared common blocks to a multiple of 8 bytes. This option is useful when sharing shared common blocks betweenf 77programs and f 90-generated programs. All source files

	referencing the same shared common block must be compiled with the same setting of this flag.
-O[n]	-Oinvokes the optimizer, where n is the level of optimization, 0 - 4. The default is optimization
	level 2.
+On	+O invokes the optimizer, where n is the level of optimization, 0 - 4. The -goption is compatible
	with the +O0, +O1, and +O2 options.
	Table 2-6 lists and describes the different levels of optimization.

NOTE: See the Parallel Programming Guide for HP-UX Systems for a detailed description of optimization levels and methods.

+O[no]optimization	+O[no] options enable or disable specific optimizations or classes of optimizations
	(for example, optimizations that affect compilation time). For detailed information
	about +O[no]optimization, see “Using optimization options” (page 38).

Command-line options 31