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Re: weak linking


On 30 Mar 2008, at 01:47, email@hidden wrote:

I use in some Cocoa app a weak linked library. 

[...]

if (weak_function == NULL)
{
	NSLog(@"%s weak_function %p NULL", __FUNCTION__, weak_function );
}
else
{
	NSLog(@"%s weak_function %p non-NULL", __FUNCTION__, weak_function );
}

The result without library is:
... weak_function 0x0 non-NULL

10.4.11, powerpc-apple-darwin8-gcc-4.0.1.

Without this line:
extern void weak_function() __attribute__((weak_import));
the compiler notices that weak_function is non-NULL during compilation and optimizes under the assumption that it will remain non-NULL even at run time.

Kind regards,

Gerriet.


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