HP Fortran v2.9 for HP-UX 11i v2 Release Note5991-0697

HP Fortran for HP-UX v2.9

What’s in This Version

Chapter 1 13

Specifying a binary conversion

There are three ways to specify what file/unit should be converted, and which conversion to

apply (in priority, with highest priority listed first):

• Environment variable: “FORT_CONVERT<unit_num>”

• Environment variable: “FORT_CONVERT”—all I/O units

• Argument to OPEN: “CONVERT=”

Typically, code is written via the CONVERT=argument to OPEN and INQUIRE. Therefore,

this option was given the higher priority status to allow overriding “normal” coding via the

environment variable.

NOTE The CONVERT parameter to OPEN is only available via f90 version 2.7 or

later, and is only accepted for UNFORMATTED files.

Resolving issues with unaligned data

The following suggestions will aid with issues regarding unaligned data:

For Itanium

—based applications

As a quick fix, add the following call to the main program:

call allow_unaligned_data_access( )

Then, link in an additional library that fixes these alignment issues at runtime:

-lunalign

Longer term, try compiling with the following flag:

+allow_unaligned

An example would be:

PROGRAM bs30

INTEGER*2 i2(10)

INTEGER*4 i4

EQUIVALENCE (i2(2), i4)

DATA I4 /z’FFFF0000’/

i4=12

call allow_unaligned_data_access()

print *,i4

END