DISPATCH_QUEUE_CONCURRENT is Lion-only
Reported by John Ralls | March 13th, 2012 @ 09:50 PM
Compiling on Snow Leopard with XCode 4.2 fails with
/Users/john/gitx/PBGitRepository.m:37:2: error: use of undeclared identifier 'DISPATCH_QUEUE_CONCURRENT' [3]
dispatch_once(&onceToken, ^{
^
/usr/include/dispatch/once.h:63:96: note: instantiated from:
#define dispatch_once(x, ...) do { if (__builtin_expect(*(x), ~0l) != ~0l) dispatch_once((x), (__VA_ARGS__)); } while (0)
^
/Users/john/gitx/PBGitRepository.m:38:53: note: instantiated from:
work_queue = dispatch_queue_create("PBWorkQueue", DISPATCH_QUEUE_CONCURRENT);
^
1 error generated.
It seems that DISPATCH_QUEUE_CURRENT was introduced in Lion. Is it your intent to support only Lion and later?
Comments and changes to this ticket
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John Ralls March 13th, 2012 @ 11:14 PM
Never mind. It seems that one can't build for ARC on Snow Leopard anyway.
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GitX is the nice-looking gitk clone for OS X
John Ralls
Pieter de Bie