On 30 Mar 2008, at 01:47, [EMAIL PROTECTED] 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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