HP Fortran Programmer's Guide (March 2010)

Compiling and linking

Compiling with the f90 command

Chapter 2 45

• Directories specified by the -I option, in the order specified

• The current working directory

•The /usr/include directory

+[no]implicit_none

+implicit_none forces the types of identifiers to be implicitly undefined.

This is equivalent to specifying IMPLICIT NONE for each program unit in

each file in the files list. The source code that is to be compiled with this

option may contain other IMPLICIT statements; the statements will be

honored. The default, +noimplicit_none, allows identifiers to be implicitly

defined.

+indirectcommonlist=file

The common blocks listed in file (one per line, no enclosing ‘ / ‘s) are

treated as shared common blocks, but are not attached. The user must

attach or otherwise allocate storage for such common blocks before they are

referenced.

A C language program would typically be used to either attach a shared

memory segment, or malloc a block of memory, and store that address into

the external symbol for the common block. All Fortran code that references

such a common block will indirect through the address in the external

symbol for that indirect common block.

All source files that reference variables in such a common block must be

compiled with the +indirectcommonlist flag, and that common block name

must appear in the named file.

+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 NOSTANDARDIO flag 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 +Ofaster are used.