Leading Underscore [ HP C Programmer's Guide ] MPE/iX 5.0 Documentation
HP C Programmer's Guide
Leading Underscore
External names on the HP 9000 Series 700/800 do not contain a leading
underscore. You need to change any programs that rely on external names
containing leading underscores. Note that all languages on the HP 9000
Series 700/800 follow the same convention. Therefore, only assembly
language code and names that were aliased in other languages are affected
by this. Because there is no leading underscore, external names contain
one additional significant character. Identifiers that differ only in
the 255th character will denote different items on the HP 9000 Series
700/800.
MPE/iX 5.0 Documentation