__declspec(noinline) attribute suppresses the inlining of a function at the call points of the function.
__declspec(noinline) can also be applied to constant data, to prevent the
compiler from using the value for optimization purposes, without affecting its placement in
the object. This is a feature that can be used for patchable constants, that is, data that
is later patched to a different value. It is an error to try to use such constants in a
context where a constant value is required. For example, an array dimension.
__declspecattribute has the function attribute equivalent
/* Prevent y being used for optimization */ __declspec(noinline) const int y = 5; /* Suppress inlining of foo() wherever foo() is called */ __declspec(noinline) int foo(void);