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struct { int foo; } bar; extern "C" int* i; extern "C" { int* i; } int *i; extern "C" NSString* i; extern "C" { NSString* i; } NSString* i; __attribute__((visibility("default"))) int* i; __attribute__((visibility("default"))) NSString* i; #define DEFINE_NOTIFICATION(name) extern "C" __attribute__((visibility ("default"))) NSString* const name = @#name;