HP Fortran Programmer's Guide (B3908-90031; September 2011)

Porting to HP Fortran
Using porting options
Chapter 11250
It is important to note that +cfc requires the following runtime library patches to function properly:
• PHSS_31970—liblO77 11.22/11.23 0409
• PHSS_31971—libcl 11.11
• PHSS_31972—libcl 11.23 0409 (also pa-sharelibs for use through aries)
• PHSS_31973—libF90 11.22/11.23 0409
• PHSS_31974—libF90 11.11
NOTE +cfc will not work without the patches listed above.
Enhancements
The following enhancements have been made to support the addition of new Tru64 Fortran options:
• Added CLF_TRU64 bit to command-line flags, used to distinguish migration options from ‘regular’
options.
• Added support for CLF_DETACHED_SUB_OPT bit in command-line flags, used to indicate flags with a
space-delimited sub-option (-foo bar), not to be confused with flags that take a space-separated
argument.
• Added TRU64DRIVER as new (pseudo-) phase in the f90 driver.
• Added/updated Compaq-mode determination code in driver. Now done early in main(), in case other
driver components need to know the state of compaq_flag prior to standard options processing.
• Added support for Compaq-mode defaults to be emitted, when they differ from HP-mode.
•Added ‘-align’ option to main table; created tru64_align_flags table for sub-options.
• Made all new -align options conflict with existing +A and +allow_unaligned options.
• Modifed EPC to allow for finer-grained control of alignment attributes for COMMONs, record fields, and
SEQUENCE derived types (previously, these could not be specified individually).
• Modified BRIDGE to allow U2 unaligned record field subtypes to be emitted in 2, 4, and 8 byte record
modes (previously only done for packed fields). As with packed fields, this is done for Itanium
processor family systems only, since the PA-RISC backend doesn’t assert on this condition.
New options
The following Tru64 Fortran options have been added:
• -fpconstant flag (alternate spelling of -R8)