On 27 Jul 2017, at 17:06, Fred Kiefer <fredkie...@gmx.de> wrote:
>
>>
>> Am 27.07.2017 um 10:26 schrieb David Chisnall <thera...@sucs.org>:
>>
>> On 26 Jul 2017, at 14:58, Josh Freeman <gnustep_li...@twilightedge.com>
>> wrote:
>>>
>>> On Jul 26, 2017, at 7:37 AM, Daniel Ferreira (theiostream) wrote:
>>>
>>>> Also, the reason it just does not assign the same const string to the
>>>> different constants is because the two consts should be the same pointer,
>>>> and doing it explicitly seemed like a good way to make that intent clear
>>>> and guarantee that would happen.
>>>
>>>
>>> Changing the second string constant into a macro of the first would
>>> guarantee they're the same pointer:
>>>
>>> APPKIT_EXPORT NSString *NSStringPboardType;
>>>
>>> ...
>>>
>>> #if OS_API_VERSION(MAC_OS_X_VERSION_10_6, GS_API_LATEST)
>>> # define NSPasteboardTypeString NSStringPboardType
>>> #endif
>>
>> Am I missing something? Why not simply make the first symbol an alias for
>> the second?
>
>
> David, what do you mean by alias?
I thought that GCC had an attribute for it, but apparently not. The following
works on ELF platforms, at least, and there are equivalents for Mach-O:
#include <stdio.h>
int x;
extern int y;
asm (".weakref y, x");
int main(void)
{
y = 0;
x = 42;
// Prints 42
printf(“%d\n”, y);
}
So this would work for our use:
extern NSPasteboardTypeString;
asm(".weakref NSPasteboardTypeString NSStringPboardType");
We’d end up in the linked binary with a single location with two symbol names.
David
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