TASKING VX-toolset for ARM User Guide

TASKING VX-toolset for ARM User Guide• Implicit type conversion between a pointer to an extern "C" function and a pointer to an extern"C++" function is permitted. Here's an example:extern "C" void f(); // f's type has extern "C" linkagevoid (*pf)() // pf points to an extern "C++" function= &f; // error unless implicit conversion is// allowedThis extension is allowed in environments where C and C++ functions share the same callingconventions. It is enabled by default.• A "?" operator whose second and third operands are string literals or wide string literals can be implicitlyconverted to "char *" or "wchar_t *". (Recall that in C++ string literals are const. There is adeprecated implicit conversion that allows conversion of a string literal to "char *", dropping the const.That conversion, however, applies only to simple string literals. Allowing it for the result of a "?" operationis an extension.)char *p = x ? "abc" : "def";• Default arguments may be specified for function parameters other than those of a top-level functiondeclaration (e.g., they are accepted on typedef declarations and on pointer-to-function andpointer-to-member-function declarations).• Non-static local variables of an enclosing function can be referenced in a non-evaluated expression(e.g., a sizeof expression) inside a local class. A warning is issued.• In default C++ mode, the friend class syntax is extended to allow nonclass types as well as class typesexpressed through a typedef or without an elaborated type name. For example:typedef struct S ST;class C {friend S; // OK (requires S to be in scope).friend ST; // OK (same as "friend S;").friend int; // OK (no effect).friend S const; // Error: cv-qualifiers cannot// appear directly.};• In default C++ mode, mixed string literal concatenations are accepted. (This is a feature carried overfrom C99 and also available in GNU modes).wchar_t *str = "a" L"b"; // OK, same as L"ab".• In default C++ mode, variadic macros are accepted. (This is a feature carried over from C99 and alsoavailable in GNU modes.)• In default C++ mode, empty macro arguments are accepted (a feature carried over from C99).• A trailing comma in the definition of an enumeration type is silently accepted (a feature carried overfrom C99):46