Re: weakref and static

[Geoffrey Keating]

On 17/12/2005, at 10:08 AM, Jakub Jelinek wrote:

But there are dozens of other uses of TREE_PUBLIC in the backends, so


Normal aliases are usually declared through
extern __typeof (foo) bar __attribute__((alias ("foo")));

weakref aliases couldn't be declared the same way.

it wouldn't surprise me if something similar is not present on other arches. eventhough the alias really is defined in that file, so I don't see why

extern int x(void) { return 1; }
extern int i3 = 3;

In ISO C, 'extern' does not mean 'not defined in this file', it means 'visible outside this file'. For instance, are both valid ISO C, although they're unusual and the compiler warns about the second one. The reason you can't define weakref aliases 'the same way' is because the functionality doesn't exist; there is no way to define a weakref which is visible outside the file it's defined in, the object file format doesn't support it.

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