weak

In this section:

#pragma weak symbol1[=symbol2]

`symbol1`	A function or variable with external linkage.
`symbol2`	A defined function or variable.

This pragma directive can be used in one of two ways:

To make the definition of a function or variable with external linkage a weak definition. The __weak attribute can also be used for this purpose.
To create a weak alias for another function or variable. You can make more than one alias for the same function or variable.

To make the definition of foo a weak definition, write:

#pragma weak foo

To make NMI_Handler a weak alias for Default_Handler, write:

#pragma weak NMI_Handler=Default_Handler

If NMI_Handler is not defined elsewhere in the program, all references to NMI_Handler will refer to Default_Handler.

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