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

◦ An extra comma is allowed at the end of an enum list. A remark is issued. (C and C++
behavior is the same.)
◦ In an initializer, a pointer constant value can be cast to an integral type if the integral
type is large enough to contain it.
◦ long float is accepted as a synonym for double. (C and C++ behavior is the same.)
◦ The #assert preprocessing extensions of AT&T System V release 4 are allowed. These
allow definition and testing of predicate names. Such names are in a namespace distinct
from all other names, including macro names.
A predicate name is given a definition by a preprocessing directive of the form:
#assert name #assert name (token-sequence)
which defines the predicate name. In the first form, the predicate is not given a value. In
the second form, it is given the value token-sequence. Such a predicate can be tested in
an #if expression:
#name (token-sequence)
which has the value 1 if a #assert of that name with that token-sequence has appeared,
and 0 otherwise. A predicate can be given more than one value at a given time.
A predicate can be deleted by a preprocessing directive of the form:
#unassert name
#unassert name (token-sequence)
The first form removes all definitions of the indicated prediate name; the second form
removes just the indicated definition, leaving any others there might be.
◦ External entities declared in other scopes are visible. A warning is issued when compiled
with extensions. When compiled without extensions, an error is issued. (This is not allowed
in C++.)
void f1(void) {
extern void f();
}
void f2() {
f(); /* Using out of scope declaration */
}
EXTERN_DATA
The EXTERN_DATA pragma specifies whether external data references (object declared extern)
can use GP-relative addressing.
EXTERN_DATA value [variable-name [,variable-name]]
value:
{ GP_OK | NO_GP }
GP_OK
means that GP-relative addressing is allowed. This value is not valid for the TNS/E compilers.
NO_GP
means that GP-relative addressing must not be used. This is the value that typically indicates
that the data is exported by an SRL.
variable-name
identifies a variable that has previously been declared.
EXTERN_DATA 189