C/C++ Programmer's Guide (G06.27+, H06.08+, J06.03+)

Table 30 Effects of FUNCTION Attributes (continued)
aliasvariableresidentextensibleNo attributeLanguage
ValidErrorIgnoreErrorValidfortran
ValidValidIgnoreValidValidpascal
ValidValidValidValidValidtal
ValidValidIgnoreValidValidunspecified
The pragma default settings are:
SYSTYPE OSSSYSTYPE GUARDIAN
Not setNot setTNS C compiler
Not setNot setG-series TNS c89 utility
Not setNot setTNS/R native C and C++ compilers
N.A.N.A.Native c89 and c99 utilities
Not setNot setTNS/E native C and C++ compilers
Usage Guidelines
• The FUNCTION pragma can be entered on the compiler RUN command line or in the source
text. For TNS c89, the FUNCTION pragma must be entered in the source file.
• The alias attribute cannot be used with a pointer to a function.
• The extensible and variable attributes cannot be specified for a function that passes or
returns a structure by value.
• Only one language can be specified for a function.
• FUNCTION can be entered in either uppercase or lowercase.
• The extensible and variable attributes cannot both be specified for the same function.
• If you declare an external procedure as unspecified, the actual procedure cannot be both
written in C and compiled using the OLDCALLS pragma.
• Unlike previous methods for declaring external functions, the FUNCTION pragma is compliant
with the ISO/ANSI C standard.
• The language attribute tal identifies both TAL and pTAL procedures.
• The param-count argument for the extensible attribute can be used only for native C
and C++ programs.
• Cfront imposes these additional restrictions on the FUNCTION pragma:
It cannot be used for C++ functions or to change the language attribute.◦
◦ It can be applied only to functions in the global scope.
◦ No other pragmas can appear on the same line as a FUNCTION pragma.
◦ The resident and alias attributes cannot be used.
• C-style variable argument lists (...) cannot be used in variable and extensible functions.
FUNCTION 197