Created
September 14, 2012 23:08
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Weak linking with extern NSString *const issue
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| #import <Social/Social.h> | |
| /* Compiled with iOS 6 SDK | |
| * Social.framework weak linked (Optional) | |
| * Run on iOS 5.1 (simulator and device) | |
| * Output is: | |
| * 0x0 | |
| * About to crash | |
| * +++ EXC_BAD_ACCESS +++ | |
| */ | |
| int main(int argc, char *argv[]) | |
| { | |
| @autoreleasepool | |
| { | |
| NSLog(@"%p", &SLServiceTypeFacebook); | |
| if (&SLServiceTypeFacebook) | |
| { | |
| NSLog(@"About to crash"); | |
| NSString *serviceType = SLServiceTypeFacebook; // crashes here with EXC_BAD_ACCESS (code=2, address=0x0) | |
| NSLog(@"Not reached %@", serviceType); | |
| } | |
| } | |
| return 0; | |
| } |
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See Checking for Weak Linked Frameworks, Checking the address of a weak lInked symbol under LLVM not working as expected and Checking for symbols in weakly linked frameworks shouldn't get optimized out for workarounds.