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__declspec attributes

The __declspec keyword enables you to specify special attributes of objects and functions. For example, you can use the __declspec keyword to declare imported or exported functions and variables, or to declare Thread Local Storage (TLS) objects.

The __declspec keyword must prefix the declaration specification. For example:

__declspec(noreturn) void overflow(void);
__declspec(thread) int i;

Table 9 summarizes the available __declspec attributes. __declspec attributes are storage class modifiers. They do not affect the type of a function or variable.

Table 9. __declspec attributes that the compiler supports, and their equivalents
__declspec attributenon __declspec equivalent
__declspec(dllexport)-
__declspec(dllimport)-
__declspec(noinline)__attribute__((noinline))[a]
__declspec(noreturn)__attribute__((noreturn))[a]
__declspec(nothrow)-
__declspec(notshared)-
__declspec(thread)-

[a] A GNU compiler extension that the ARM compiler supports.